Pub Date : 2025-07-09DOI: 10.1088/1361-6633/adedb1
Per Söderlind,Alexander Landa,Lorin Benedict,Nir Goldman,R Q Hood,K E Kweon,E E Moore,Aurelien Perron,Babak Sadigh,Christine J Wu,Lin H Yang
We present an ab initio free energy model derived from a fully relativistic density functional theory (DFT) electronic structure with dynamic magnetism for δ-plutonium (face-centered cubic, fcc). The DFT model is extended with orbital-orbital interaction in a parameter free orbital polarization (OP) mechanism consistent with previous modeling of plutonium. Gibbs free energy is built from components associated with the temperature dependence of the electronic structure and the corresponding electronic entropy, lattice vibrations within an anharmonic lattice dynamics model, and dynamical fluctuations of the magnetization density, i.e., magnetic fluctuations. The fluctuation model consists of transverse and longitudinal modes driven by temperature induced excitations of the DFT+OP electronic structure. The ab initio model thus incorporates fluctuating states beyond the electronic ground state. Thanks to the dynamic magnetism, the theory predicts excellent thermodynamic properties and a Gibbs free energy in accord with CALPHAD and semi-empirical modeling developed from the thermodynamic observables. The magnetic fluctuations further explain anomalous behaviors of the thermal expansion in plutonium. Specifically, a thermal expansion for the δ-plutonium system turning from positive to negative at temperatures above room temperature, a tendency for gallium to reduce and remove the negative thermal expansion depending on composition, and a positive thermal expansion for the high temperature ε phase.
{"title":"εεFirst principles free energy model with dynamic magnetism for δ-plutonium.","authors":"Per Söderlind,Alexander Landa,Lorin Benedict,Nir Goldman,R Q Hood,K E Kweon,E E Moore,Aurelien Perron,Babak Sadigh,Christine J Wu,Lin H Yang","doi":"10.1088/1361-6633/adedb1","DOIUrl":"https://doi.org/10.1088/1361-6633/adedb1","url":null,"abstract":"We present an ab initio free energy model derived from a fully relativistic density functional theory (DFT) electronic structure with dynamic magnetism for δ-plutonium (face-centered cubic, fcc). The DFT model is extended with orbital-orbital interaction in a parameter free orbital polarization (OP) mechanism consistent with previous modeling of plutonium. Gibbs free energy is built from components associated with the temperature dependence of the electronic structure and the corresponding electronic entropy, lattice vibrations within an anharmonic lattice dynamics model, and dynamical fluctuations of the magnetization density, i.e., magnetic fluctuations. The fluctuation model consists of transverse and longitudinal modes driven by temperature induced excitations of the DFT+OP electronic structure. The ab initio model thus incorporates fluctuating states beyond the electronic ground state. Thanks to the dynamic magnetism, the theory predicts excellent thermodynamic properties and a Gibbs free energy in accord with CALPHAD and semi-empirical modeling developed from the thermodynamic observables. The magnetic fluctuations further explain anomalous behaviors of the thermal expansion in plutonium. Specifically, a thermal expansion for the δ-plutonium system turning from positive to negative at temperatures above room temperature, a tendency for gallium to reduce and remove the negative thermal expansion depending on composition, and a positive thermal expansion for the high temperature ε phase.","PeriodicalId":21110,"journal":{"name":"Reports on Progress in Physics","volume":"107 1","pages":""},"PeriodicalIF":18.1,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144594352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-07DOI: 10.1088/1361-6633/adecb1
Tianyu Zhao,Jingxiang Zhang,Mengrui Wang,Manming Shu,Xiangda Fu,Jiajing Yan,Yansheng Liang,Shaowei Wang,Ming Lei
Due to its low light dose, ultra-high imaging speed and super-resolution, structured illumination microscopy (SIM) is now widely used in various applications to study dynamic interactions between intracellular structures of living cells. However, real-time imaging remains challenging due to the limitations of existing reconstruction algorithms, such as spatial frequency domain conversion, iterative parameter estimation, and complex deconvolution. To achieve "what you see is what you get", the reconstruction algorithm of SIM needs to be improved. Here, we first briefly introduce the principle of super-resolution microscopy and SIM. Then, we comparatively review the algorithms for reconstructing super-resolution images in SR-SIM and discuss the advantages and disadvantages of each algorithm. To achieve real-time reconstruction, we propose a joint space and frequency reconstruction (JSFR) framework. Based on the JSFR framework, we realize a high image reconstruction speed and demonstrate its capability in real-time artifact reduction super-resolution imaging for 2D-SIM, 3D-SIM, and nonlinear SIM. Finally, we explore the prospects of the proposed technique by discussing its potential applications as a data platform for deep learning and live cell observation.
.
{"title":"Real-time super-resolution structured illumination microscopy: current progress in joint space and frequency reconstruction.","authors":"Tianyu Zhao,Jingxiang Zhang,Mengrui Wang,Manming Shu,Xiangda Fu,Jiajing Yan,Yansheng Liang,Shaowei Wang,Ming Lei","doi":"10.1088/1361-6633/adecb1","DOIUrl":"https://doi.org/10.1088/1361-6633/adecb1","url":null,"abstract":"Due to its low light dose, ultra-high imaging speed and super-resolution, structured illumination microscopy (SIM) is now widely used in various applications to study dynamic interactions between intracellular structures of living cells. However, real-time imaging remains challenging due to the limitations of existing reconstruction algorithms, such as spatial frequency domain conversion, iterative parameter estimation, and complex deconvolution. To achieve \"what you see is what you get\", the reconstruction algorithm of SIM needs to be improved. Here, we first briefly introduce the principle of super-resolution microscopy and SIM. Then, we comparatively review the algorithms for reconstructing super-resolution images in SR-SIM and discuss the advantages and disadvantages of each algorithm. To achieve real-time reconstruction, we propose a joint space and frequency reconstruction (JSFR) framework. Based on the JSFR framework, we realize a high image reconstruction speed and demonstrate its capability in real-time artifact reduction super-resolution imaging for 2D-SIM, 3D-SIM, and nonlinear SIM. Finally, we explore the prospects of the proposed technique by discussing its potential applications as a data platform for deep learning and live cell observation.
.","PeriodicalId":21110,"journal":{"name":"Reports on Progress in Physics","volume":"8 1","pages":""},"PeriodicalIF":18.1,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144578599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-06-29DOI: 10.1088/1361-6633/ade625
Xiuyang Xia, Yuhan Peng, Ka Ki Li and Ran Ni
To unlock the potential for assembling complex colloidal ‘molecules’, we investigate a minimal binary system of programmable colloidal atom-electron equivalents (PAE-EE), where electron equivalents (EEs) are multivalent linkers with two distinct types of single-stranded DNA (ssDNA) ends complementary to those ssDNAs on binary programmable atom equivalents (PAEs). We derive a statistical mechanical framework for calculating the effective interaction between PAEs mediated by EEs with arbitrary valency, which quantitatively agrees with simulations using explicit EEs. Our analysis reveals an anomalous dependence of PAE-PAE interactions on the EE valency, showing that EE-mediated interactions converge at the large valency limit. Moreover, we identify an optimal EE valency that maximizes the interaction difference between targeted and non-targeted binding pairs of PAEs. These findings offer design principles for targeted self-assembly in PAE-EE systems.
{"title":"Designed self-assembly of programmable colloidal atom-electron equivalents","authors":"Xiuyang Xia, Yuhan Peng, Ka Ki Li and Ran Ni","doi":"10.1088/1361-6633/ade625","DOIUrl":"https://doi.org/10.1088/1361-6633/ade625","url":null,"abstract":"To unlock the potential for assembling complex colloidal ‘molecules’, we investigate a minimal binary system of programmable colloidal atom-electron equivalents (PAE-EE), where electron equivalents (EEs) are multivalent linkers with two distinct types of single-stranded DNA (ssDNA) ends complementary to those ssDNAs on binary programmable atom equivalents (PAEs). We derive a statistical mechanical framework for calculating the effective interaction between PAEs mediated by EEs with arbitrary valency, which quantitatively agrees with simulations using explicit EEs. Our analysis reveals an anomalous dependence of PAE-PAE interactions on the EE valency, showing that EE-mediated interactions converge at the large valency limit. Moreover, we identify an optimal EE valency that maximizes the interaction difference between targeted and non-targeted binding pairs of PAEs. These findings offer design principles for targeted self-assembly in PAE-EE systems.","PeriodicalId":21110,"journal":{"name":"Reports on Progress in Physics","volume":"27 1","pages":""},"PeriodicalIF":18.1,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144516123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-06-11DOI: 10.1088/1361-6633/addf5f
J G Tobin and M F Beaux
The quantitative determination of the 5f population in α-Pu and δ-Pu is reconsidered in detail. Trends across the 5f series are discussed, including atomic sizes, 5f populations and computational modeling. A recently developed and novel approach, based upon a thermodynamical evaluation of entropies, is presented. Finally, a detailed spectroscopic analysis of the original Pu N4,5 and O4,5 x-ray absorption spectroscopy has been performed, including the correction of a fundamental flaw in the Electron Energy Loss Spectroscopy (EELS) measurements. Thus, the determination of the 5 f occupation (n) in elemental Pu has been re-evaluated with the result that n = 5.0 ± 0.1 for αPu and n = 4.9 ± 0.2 for δPu. These values are significantly lower than the value of ∼5½ that was propagated earlier.
{"title":"Pu 5f population: the case for n = 5.0","authors":"J G Tobin and M F Beaux","doi":"10.1088/1361-6633/addf5f","DOIUrl":"https://doi.org/10.1088/1361-6633/addf5f","url":null,"abstract":"The quantitative determination of the 5f population in α-Pu and δ-Pu is reconsidered in detail. Trends across the 5f series are discussed, including atomic sizes, 5f populations and computational modeling. A recently developed and novel approach, based upon a thermodynamical evaluation of entropies, is presented. Finally, a detailed spectroscopic analysis of the original Pu N4,5 and O4,5 x-ray absorption spectroscopy has been performed, including the correction of a fundamental flaw in the Electron Energy Loss Spectroscopy (EELS) measurements. Thus, the determination of the 5 f occupation (n) in elemental Pu has been re-evaluated with the result that n = 5.0 ± 0.1 for αPu and n = 4.9 ± 0.2 for δPu. These values are significantly lower than the value of ∼5½ that was propagated earlier.","PeriodicalId":21110,"journal":{"name":"Reports on Progress in Physics","volume":"4 1","pages":""},"PeriodicalIF":18.1,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144268582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-05-26DOI: 10.1088/1361-6633/add9c5
Yunbo Ou, Murod Mirzhalilov, Norbert M Nemes, Jose L Martinez, Mirko Rocci, Alexander Duong, Austin Akey, Alexandre C Foucher, Wenbo Ge, Dhavala Suri, Yiping Wang, Haile Ambaye, Jong Keum, Mohit Randeria, Nandini Trivedi, Kenneth S Burch, David C Bell, Frances M Ross, Weida Wu, Don Heiman, Valeria Lauter, Jagadeesh S Moodera and Hang Chi
Exchange-coupled interfaces are pivotal in exploiting two-dimensional (2D) ferromagnetism. Due to the extraordinary correlations among charge, spin, orbital and lattice degrees of freedom, layered magnetic transition metal chalcogenides (TMCs) bode well for exotic topological phenomena. Here we report the realization of wafer-scale Cr2Te3 down to monolayer (ML) on insulating SrTiO3(111) and/or Al2O3(001) substrates using molecular beam epitaxy. Robust ferromagnetism persists in the 2D limit. In particular, the Curie temperature TC of 2 ML Cr2Te3 increases from 100 K to ∼120 K when proximitized to topological insulator (TI) (Bi,Sb)2Te3, with substantially boosted magnetization as observed via polarized neutron reflectometry. Our experiments and theory strongly indicate that the Bloembergen–Rowland interaction is likely universal underlying TC enhancement in TI-coupled magnetic heterostructures. The topological-surface-enhanced magnetism in 2D TMC enables further exchange coupling physics and quantum hybrid studies, including paving the way to realize interface-modulated topological electronics.
交换耦合界面是开发二维（2D）铁磁性的关键。由于电荷、自旋、轨道和晶格自由度之间的特殊相关性，层状磁性过渡金属硫族化合物（TMCs）预示着奇异拓扑现象的出现。本文报道了利用分子束外延技术在SrTiO3（111）和/或Al2O3（001）衬底上实现了晶圆级Cr2Te3的单层（ML）。强健的铁磁性在二维极限中持续存在。特别是，当接近于拓扑绝缘体（TI） （Bi,Sb）2Te3时，2 ML Cr2Te3的居里温度TC从100 K增加到~ 120 K，通过极化中子反射法观察到磁化强度大大提高。我们的实验和理论有力地表明，在ti耦合磁异质结构中，Bloembergen-Rowland相互作用可能是TC增强的普遍基础。二维TMC中的拓扑表面增强磁性使进一步的交换耦合物理和量子混合研究成为可能，包括为实现界面调制拓扑电子学铺平道路。
{"title":"Enhanced ferromagnetism in monolayer Cr2Te3 via topological insulator coupling","authors":"Yunbo Ou, Murod Mirzhalilov, Norbert M Nemes, Jose L Martinez, Mirko Rocci, Alexander Duong, Austin Akey, Alexandre C Foucher, Wenbo Ge, Dhavala Suri, Yiping Wang, Haile Ambaye, Jong Keum, Mohit Randeria, Nandini Trivedi, Kenneth S Burch, David C Bell, Frances M Ross, Weida Wu, Don Heiman, Valeria Lauter, Jagadeesh S Moodera and Hang Chi","doi":"10.1088/1361-6633/add9c5","DOIUrl":"https://doi.org/10.1088/1361-6633/add9c5","url":null,"abstract":"Exchange-coupled interfaces are pivotal in exploiting two-dimensional (2D) ferromagnetism. Due to the extraordinary correlations among charge, spin, orbital and lattice degrees of freedom, layered magnetic transition metal chalcogenides (TMCs) bode well for exotic topological phenomena. Here we report the realization of wafer-scale Cr2Te3 down to monolayer (ML) on insulating SrTiO3(111) and/or Al2O3(001) substrates using molecular beam epitaxy. Robust ferromagnetism persists in the 2D limit. In particular, the Curie temperature TC of 2 ML Cr2Te3 increases from 100 K to ∼120 K when proximitized to topological insulator (TI) (Bi,Sb)2Te3, with substantially boosted magnetization as observed via polarized neutron reflectometry. Our experiments and theory strongly indicate that the Bloembergen–Rowland interaction is likely universal underlying TC enhancement in TI-coupled magnetic heterostructures. The topological-surface-enhanced magnetism in 2D TMC enables further exchange coupling physics and quantum hybrid studies, including paving the way to realize interface-modulated topological electronics.","PeriodicalId":21110,"journal":{"name":"Reports on Progress in Physics","volume":"15 1","pages":""},"PeriodicalIF":18.1,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144145711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-05-14DOI: 10.1088/1361-6633/adcd9a
The ATLAS Collaboration
A measurement of off-shell Higgs boson production in the decay channel is presented. The measurement uses 140 fb−1 of proton–proton collisions at TeV collected by the ATLAS detector at the Large Hadron Collider and supersedes the previous result in this decay channel using the same dataset. The data analysis is performed using a neural simulation-based inference method, which builds per-event likelihood ratios using neural networks. The observed (expected) off-shell Higgs boson production signal strength in the decay channel at 68% CL is ( ). The evidence for off-shell Higgs boson production using the decay channel has an observed (expected) significance of 2.5σ (1.3σ). The expected result represents a significant improvement relative to that of the previous analysis of the same dataset, which obtained an expected significance of 0.5σ. When combined with the most recent ATLAS measurement in the decay channel, the evidence for off-shell Higgs boson production has an observed (expected) significance of 3.7σ (2.4σ). The off-shell measurements are combined with the measurement of on-shell Higgs boson production to obtain constraints on the Higgs boson total width. The observed (expected) value of the Higgs boson width at 68% CL is ( ) MeV.
{"title":"Measurement of off-shell Higgs boson production in the H ∗ →...","authors":"The ATLAS Collaboration","doi":"10.1088/1361-6633/adcd9a","DOIUrl":"https://doi.org/10.1088/1361-6633/adcd9a","url":null,"abstract":"A measurement of off-shell Higgs boson production in the decay channel is presented. The measurement uses 140 fb−1 of proton–proton collisions at TeV collected by the ATLAS detector at the Large Hadron Collider and supersedes the previous result in this decay channel using the same dataset. The data analysis is performed using a neural simulation-based inference method, which builds per-event likelihood ratios using neural networks. The observed (expected) off-shell Higgs boson production signal strength in the decay channel at 68% CL is ( ). The evidence for off-shell Higgs boson production using the decay channel has an observed (expected) significance of 2.5σ (1.3σ). The expected result represents a significant improvement relative to that of the previous analysis of the same dataset, which obtained an expected significance of 0.5σ. When combined with the most recent ATLAS measurement in the decay channel, the evidence for off-shell Higgs boson production has an observed (expected) significance of 3.7σ (2.4σ). The off-shell measurements are combined with the measurement of on-shell Higgs boson production to obtain constraints on the Higgs boson total width. The observed (expected) value of the Higgs boson width at 68% CL is ( ) MeV.","PeriodicalId":21110,"journal":{"name":"Reports on Progress in Physics","volume":"78 1","pages":""},"PeriodicalIF":18.1,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143979527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-05-13DOI: 10.1088/1361-6633/add278
M E Cates and C Nardini
In active systems, whose constituents have non-equilibrium dynamics at local level, fluid-fluid phase separation is widely observed. Examples include the formation of membraneless organelles within cells; the clustering of self-propelled colloidal particles in the absence of attractive forces, and some types of ecological segregation. A schematic understanding of such active phase separation was initially borrowed from what is known for the equilibrium case, in which detailed balance holds at microscopic level. However it has recently become clear that in active systems the absence of detailed balance, although it leave phase separation qualitatively unchanged in some regimes (for example domain growth driven by interfacial tension via Ostwald ripening), can in other regimes radically alter its phenomenology at mechanistic level. For example, microphase separation can be caused by reverse Ostwald ripening, a process that is hard to imagine from an equilibrium perspective. This and other new phenomena arise because, instead of having a single, positive interfacial tension like their equilibrium counterparts, the fluid-fluid interfaces created by active phase separation can have several distinct interfacial tensions governing different properties, some of which can be negative. These phenomena can be broadly understood by studying continuum field theories for a single conserved scalar order parameter (the fluid density), supplemented with a velocity field in cases where momentum conservation is also present. More complex regimes arise in systems described by multiple scalar order parameters (especially with nonreciprocal interactions between these); or when an order parameter undergoes both conserved and non-conserved dynamics (such that the combination breaks detailed balance); or in systems that support orientational long-range order in one or more of the coexisting phases. In this Review, we survey recent progress in understanding the specific role of activity in phase separation, drawing attention to many open questions. We focus primarily on continuum theories, especially those with a single scalar order parameter, reviewing both analytical and numerical work. We compare their predictions with particle-based models, which have mostly been studied numerically although a few have been explicitly coarse-grained to continuum level. We also compare, where possible, with experimental results. In the latter case, qualitative comparisons are broadly encouraging whereas quantitative ones are hindered by the dynamical complexity of most experimental systems relative that of simplified (particle-level or continuum) models of active matter.
{"title":"Active phase separation: new phenomenology from non-equilibrium physics","authors":"M E Cates and C Nardini","doi":"10.1088/1361-6633/add278","DOIUrl":"https://doi.org/10.1088/1361-6633/add278","url":null,"abstract":"In active systems, whose constituents have non-equilibrium dynamics at local level, fluid-fluid phase separation is widely observed. Examples include the formation of membraneless organelles within cells; the clustering of self-propelled colloidal particles in the absence of attractive forces, and some types of ecological segregation. A schematic understanding of such active phase separation was initially borrowed from what is known for the equilibrium case, in which detailed balance holds at microscopic level. However it has recently become clear that in active systems the absence of detailed balance, although it leave phase separation qualitatively unchanged in some regimes (for example domain growth driven by interfacial tension via Ostwald ripening), can in other regimes radically alter its phenomenology at mechanistic level. For example, microphase separation can be caused by reverse Ostwald ripening, a process that is hard to imagine from an equilibrium perspective. This and other new phenomena arise because, instead of having a single, positive interfacial tension like their equilibrium counterparts, the fluid-fluid interfaces created by active phase separation can have several distinct interfacial tensions governing different properties, some of which can be negative. These phenomena can be broadly understood by studying continuum field theories for a single conserved scalar order parameter (the fluid density), supplemented with a velocity field in cases where momentum conservation is also present. More complex regimes arise in systems described by multiple scalar order parameters (especially with nonreciprocal interactions between these); or when an order parameter undergoes both conserved and non-conserved dynamics (such that the combination breaks detailed balance); or in systems that support orientational long-range order in one or more of the coexisting phases. In this Review, we survey recent progress in understanding the specific role of activity in phase separation, drawing attention to many open questions. We focus primarily on continuum theories, especially those with a single scalar order parameter, reviewing both analytical and numerical work. We compare their predictions with particle-based models, which have mostly been studied numerically although a few have been explicitly coarse-grained to continuum level. We also compare, where possible, with experimental results. In the latter case, qualitative comparisons are broadly encouraging whereas quantitative ones are hindered by the dynamical complexity of most experimental systems relative that of simplified (particle-level or continuum) models of active matter.","PeriodicalId":21110,"journal":{"name":"Reports on Progress in Physics","volume":"10 1","pages":""},"PeriodicalIF":18.1,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143945968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-05-09DOI: 10.1088/1361-6633/add6d4
Adriana Moreo,Elbio Dagotto,Gonzalo Alvarez,Takami Tohyama,Marcin P Mierzejewski,Jacek Herbrych
We present a comprehensive analysis of the magnetic excitations and electronic properties of {it fully quantum} double-exchange ferromagnets, i.e., systems where ferromagnetic ordering emerges from the competition between spin, charge, and orbital degrees of freedom, but without the canonical approximation of using classical localized spins. Specifically, we investigate spin excitations within the Kondo lattice-like model, as well as a two-orbital Hubbard Hamiltonian in proximity to the orbital-selective Mott phase. Computational analysis of the magnon dispersion, damping, and spectral weight within these models reveals unexpected phenomena, such as magnon mode softening and the anomalous decoherence of magnetic excitations as observed in earlier experimental efforts, but explained here without the use of the phononic degrees of freedom. We show that these effects are intrinsically linked to incoherent spectral features near the Fermi level, which arise due to the quantum nature of the local (on-site) triplets. This incoherent spectrum leads to a Stoner-like continuum on which spin excitations scatter, governing magnon lifetime and strongly influencing the dynamical spin structure factor. Our study explores the transition from coherent to incoherent magnon spectra by varying the electron density. Furthermore, we demonstrate that the magnitude of the localized spin mitigates decoherence by suppressing the incoherent spectral contributions near the Fermi level. We also discuss the effective $J_1$-$J_2$ spin Hamiltonian, which can accurately describe the large doping region characterized by the magnon-mode softening. Finally, we show that this behavior is also present in multiorbital models with partially filled orbitals, namely, in systems without localized spin moments, provided that the model is in a strong coupling regime. Our results potentially have far-reaching implications for understanding ferromagnetic ordering in various multi-band systems. These findings establish a previously unknown direct connection between the electronic correlations of those materials and spin excitations.
{"title":"Magnon damping and mode softening in quantum double-exchange ferromagnets.","authors":"Adriana Moreo,Elbio Dagotto,Gonzalo Alvarez,Takami Tohyama,Marcin P Mierzejewski,Jacek Herbrych","doi":"10.1088/1361-6633/add6d4","DOIUrl":"https://doi.org/10.1088/1361-6633/add6d4","url":null,"abstract":"We present a comprehensive analysis of the magnetic excitations and electronic properties of {it fully quantum} double-exchange ferromagnets, i.e., systems where ferromagnetic ordering emerges from the competition between spin, charge, and orbital degrees of freedom, but without the canonical approximation of using classical localized spins. Specifically, we investigate spin excitations within the Kondo lattice-like model, as well as a two-orbital Hubbard Hamiltonian in proximity to the orbital-selective Mott phase. Computational analysis of the magnon dispersion, damping, and spectral weight within these models reveals unexpected phenomena, such as magnon mode softening and the anomalous decoherence of magnetic excitations as observed in earlier experimental efforts, but explained here without the use of the phononic degrees of freedom. We show that these effects are intrinsically linked to incoherent spectral features near the Fermi level, which arise due to the quantum nature of the local (on-site) triplets. This incoherent spectrum leads to a Stoner-like continuum on which spin excitations scatter, governing magnon lifetime and strongly influencing the dynamical spin structure factor. Our study explores the transition from coherent to incoherent magnon spectra by varying the electron density. Furthermore, we demonstrate that the magnitude of the localized spin mitigates decoherence by suppressing the incoherent spectral contributions near the Fermi level. We also discuss the effective $J_1$-$J_2$ spin Hamiltonian, which can accurately describe the large doping region characterized by the magnon-mode softening. Finally, we show that this behavior is also present in multiorbital models with partially filled orbitals, namely, in systems without localized spin moments, provided that the model is in a strong coupling regime. Our results potentially have far-reaching implications for understanding ferromagnetic ordering in various multi-band systems. These findings establish a previously unknown direct connection between the electronic correlations of those materials and spin excitations.","PeriodicalId":21110,"journal":{"name":"Reports on Progress in Physics","volume":"140 1","pages":""},"PeriodicalIF":18.1,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-05-09DOI: 10.1088/1361-6633/add6b3
Pritam Chattopadhyay,Avijit Misra,Tanmoy Pandit,Goutam Paul
According to the Landauer principle, any logically irreversible process accompanies entropy production which results in heat dissipation in the environment. Erasing of information, one of the primary logically irreversible processes has a lower bound on heat dissipated into the environment, called the Landuaer bound (LB). However, the practical erasure processes dissipate much more heat than the LB. Recently there have been a few experimental investigations to reach this bound both in the classical and quantum domains. There has also been a spate of activities to enquire about this LB in finite time, with finite size heat baths, non-Markovian and nonequilibrium environment in the quantum regime where the effects of fluctuations and correlation of the systems with the bath can no longer be ignored. This article provides a comprehensive review of the recent progress on the Landauer bound, which serves as a fundamental principle in the thermodynamics of computation. We also provide a perspective for future endeavors in these directions.
Furthermore, we review the recent exploration toward establishing energetic bounds of a computational process. We also review the thermodynamic aspects of error correction which is an indispensable part of information processing and computations. In doing so, we briefly discuss the basics of these fields to provide a complete picture.
.
{"title":"Landauer principle and thermodynamics of computation.","authors":"Pritam Chattopadhyay,Avijit Misra,Tanmoy Pandit,Goutam Paul","doi":"10.1088/1361-6633/add6b3","DOIUrl":"https://doi.org/10.1088/1361-6633/add6b3","url":null,"abstract":"According to the Landauer principle, any logically irreversible process accompanies entropy production which results in heat dissipation in the environment. Erasing of information, one of the primary logically irreversible processes has a lower bound on heat dissipated into the environment, called the Landuaer bound (LB). However, the practical erasure processes dissipate much more heat than the LB. Recently there have been a few experimental investigations to reach this bound both in the classical and quantum domains. There has also been a spate of activities to enquire about this LB in finite time, with finite size heat baths, non-Markovian and nonequilibrium environment in the quantum regime where the effects of fluctuations and correlation of the systems with the bath can no longer be ignored. This article provides a comprehensive review of the recent progress on the Landauer bound, which serves as a fundamental principle in the thermodynamics of computation. We also provide a perspective for future endeavors in these directions.

Furthermore, we review the recent exploration toward establishing energetic bounds of a computational process. We also review the thermodynamic aspects of error correction which is an indispensable part of information processing and computations. In doing so, we briefly discuss the basics of these fields to provide a complete picture.
.","PeriodicalId":21110,"journal":{"name":"Reports on Progress in Physics","volume":"1 1","pages":""},"PeriodicalIF":18.1,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-05-08DOI: 10.1088/1361-6633/add1ed
Zhuning Wang,Sijie Pian,Yulei Zhang,Yaoguang Ma
{"title":"Corrigendum: Fundamental concepts, design rules and potentials in radiative cooling (2025Rep. Prog. Phys.88 045901).","authors":"Zhuning Wang,Sijie Pian,Yulei Zhang,Yaoguang Ma","doi":"10.1088/1361-6633/add1ed","DOIUrl":"https://doi.org/10.1088/1361-6633/add1ed","url":null,"abstract":"","PeriodicalId":21110,"journal":{"name":"Reports on Progress in Physics","volume":"20 1","pages":""},"PeriodicalIF":18.1,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143920980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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