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Next-to-Leading-Order Weak-Annihilation Correction to Rare B→{K,π}ℓ+ℓ− Decays
IF 8.6 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-03-07 DOI: 10.1103/physrevlett.134.091901
Yong-Kang Huang, Yue-Long Shen, Chao Wang, Yu-Ming Wang
We accomplish for the first time the next-to-leading-order computation of the weak annihilation contribution to the electroweak penguin decays B→{K,π}ℓ+ℓ−, which is an essential missing piece of the complete QCD correction to the matrix elements of hadronic operators in the weak effective Hamiltonian. Both the hard functions and the jet functions in the perturbative factorization formulas from the short-distance fluctuations at the two distinct scales mb and mbΛ are determined at O(αs). We then demonstrate that the one-loop weak annihilation correction can bring about the noticeable impacts on theory predictions for the CP asymmetries and the isospin asymmetry in the Bπ+ decays. Published by the American Physical Society 2025
{"title":"Next-to-Leading-Order Weak-Annihilation Correction to Rare B→{K,π}ℓ+ℓ− Decays","authors":"Yong-Kang Huang, Yue-Long Shen, Chao Wang, Yu-Ming Wang","doi":"10.1103/physrevlett.134.091901","DOIUrl":"https://doi.org/10.1103/physrevlett.134.091901","url":null,"abstract":"We accomplish for the first time the next-to-leading-order computation of the weak annihilation contribution to the electroweak penguin decays B</a:mi>→</a:mo>{</a:mo>K</a:mi>,</a:mo>π</a:mi>}</a:mo></a:mrow>ℓ</a:mo>+</a:mo></a:msup>ℓ</a:mo>−</a:mo></a:msup></a:math>, which is an essential missing piece of the complete QCD correction to the matrix elements of hadronic operators in the weak effective Hamiltonian. Both the hard functions and the jet functions in the perturbative factorization formulas from the short-distance fluctuations at the two distinct scales <f:math xmlns:f=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><f:msub><f:mi>m</f:mi><f:mi>b</f:mi></f:msub></f:math> and <h:math xmlns:h=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><h:msqrt><h:mrow><h:msub><h:mi>m</h:mi><h:mi>b</h:mi></h:msub><h:mi mathvariant=\"normal\">Λ</h:mi></h:mrow></h:msqrt></h:math> are determined at <k:math xmlns:k=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><k:mi mathvariant=\"script\">O</k:mi><k:mo stretchy=\"false\">(</k:mo><k:msub><k:mi>α</k:mi><k:mi>s</k:mi></k:msub><k:mo stretchy=\"false\">)</k:mo></k:math>. We then demonstrate that the one-loop weak annihilation correction can bring about the noticeable impacts on theory predictions for the <p:math xmlns:p=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><p:mi>C</p:mi><p:mi>P</p:mi></p:math> asymmetries and the isospin asymmetry in the <r:math xmlns:r=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><r:mi>B</r:mi><r:mo stretchy=\"false\">→</r:mo><r:mi>π</r:mi><r:msup><r:mo>ℓ</r:mo><r:mo>+</r:mo></r:msup><r:msup><r:mo>ℓ</r:mo><r:mo>−</r:mo></r:msup></r:math> decays. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"18 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143575191","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}
引用次数: 0
Semidefinite Relaxations for High-Dimensional Entanglement in the Steering Scenario
IF 8.6 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-03-07 DOI: 10.1103/physrevlett.134.090802
Nicola D’Alessandro, Carles Roch i Carceller, Armin Tavakoli
We introduce semidefinite programming hierarchies for benchmarking relevant entanglement properties in the high-dimensional steering scenario. Firstly, we provide a general method for detecting the entanglement dimensionality through certification of the Schmidt number. Its key feature is that the computational cost is independent of the Schmidt number under consideration. Secondly, we provide a method to estimate the fidelity of the source with any maximally entangled state. Using only basic computational means, we demonstrate the usefulness of these methods, which can be directly used to analyze experiments on high-dimensional systems. Published by the American Physical Society 2025
{"title":"Semidefinite Relaxations for High-Dimensional Entanglement in the Steering Scenario","authors":"Nicola D’Alessandro, Carles Roch i Carceller, Armin Tavakoli","doi":"10.1103/physrevlett.134.090802","DOIUrl":"https://doi.org/10.1103/physrevlett.134.090802","url":null,"abstract":"We introduce semidefinite programming hierarchies for benchmarking relevant entanglement properties in the high-dimensional steering scenario. Firstly, we provide a general method for detecting the entanglement dimensionality through certification of the Schmidt number. Its key feature is that the computational cost is independent of the Schmidt number under consideration. Secondly, we provide a method to estimate the fidelity of the source with any maximally entangled state. Using only basic computational means, we demonstrate the usefulness of these methods, which can be directly used to analyze experiments on high-dimensional systems. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"53 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143575195","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}
引用次数: 0
Classical Origins of Landau-Incompatible Transitions
IF 8.6 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-03-06 DOI: 10.1103/physrevlett.134.097103
Abhishodh Prakash, Nick G. Jones
Continuous phase transitions where symmetry is spontaneously broken are ubiquitous in physics and often found between “Landau-compatible” phases where residual symmetries of one phase are a subset of the other. However, continuous “deconfined quantum critical” transitions between Landau-incompatible symmetry-breaking phases are known to exist in certain quantum systems, often with anomalous microscopic symmetries. In this Letter, we investigate the need for such special conditions. We show that Landau-incompatible transitions can be found in a family of well-known classical statistical mechanical models with anomaly-free symmetries, introduced by José [.]. The models are anisotropic deformations of the classical 2D XY model labeled by a positive integer Q. For a range of temperatures, even Q models exhibit two Landau-incompatible partial symmetry-breaking phases and a direct transition between them for Q4. Characteristic features of deconfined quantum criticality, such as enhanced symmetries and melting of charged defects, are easily seen in a classical setting. For odd Q and corresponding temperature ranges, two regions of a single partial symmetry-breaking phase appear, split by a stable “unnecessary critical” line. We discuss experimental systems that realize these transitions and present anomaly-free quantum models that also exhibit similar phase diagrams. Published by the American Physical Society 2025
{"title":"Classical Origins of Landau-Incompatible Transitions","authors":"Abhishodh Prakash, Nick G. Jones","doi":"10.1103/physrevlett.134.097103","DOIUrl":"https://doi.org/10.1103/physrevlett.134.097103","url":null,"abstract":"Continuous phase transitions where symmetry is spontaneously broken are ubiquitous in physics and often found between “Landau-compatible” phases where residual symmetries of one phase are a subset of the other. However, continuous “deconfined quantum critical” transitions between Landau-incompatible symmetry-breaking phases are known to exist in certain quantum systems, often with anomalous microscopic symmetries. In this Letter, we investigate the need for such special conditions. We show that Landau-incompatible transitions can be found in a family of well-known classical statistical mechanical models with anomaly-free symmetries, introduced by José [.]. The models are anisotropic deformations of the classical 2D XY model labeled by a positive integer Q</a:mi></a:mrow></a:math>. For a range of temperatures, even <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:mi>Q</c:mi></c:math> models exhibit two Landau-incompatible partial symmetry-breaking phases and a direct transition between them for <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><e:mrow><e:mi>Q</e:mi><e:mo>≥</e:mo><e:mn>4</e:mn></e:mrow></e:math>. Characteristic features of deconfined quantum criticality, such as enhanced symmetries and melting of charged defects, are easily seen in a classical setting. For odd <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><g:mrow><g:mi>Q</g:mi></g:mrow></g:math> and corresponding temperature ranges, two regions of a single partial symmetry-breaking phase appear, split by a stable “unnecessary critical” line. We discuss experimental systems that realize these transitions and present anomaly-free quantum models that also exhibit similar phase diagrams. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"37 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143569742","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}
引用次数: 0
Holographic Correlators with Bogomol’nyi-Prasad-Sommerfield Bound States in N=4 Supersymmetric Yang-Mills Theory
IF 8.6 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-03-05 DOI: 10.1103/physrevlett.134.091602
Francesco Aprile, Stefano Giusto, Rodolfo Russo
We compute four-point correlators in N=4 SU(N) super-Yang-Mills theory with both single and double-particle 1/2-Bogomol’nyi-Prasad-Sommerfield (BPS) operators in the regime of large ’t Hooft coupling and large N. In particular, we give explicit expressions up to O(1/N4) for the lightest correlator with two double-particle and two single-particle operators built out of the stress-tensor multiplet. Our derivation makes use of the general holographic prescription applied to an asymptotically AdS5×S5 geometry that describes a coherent superposition of multigraviton operators. The final result can be written in terms of a natural generalization of the standard D functions and takes a compact form in Mellin space. The correlator we compute here is the simplest of a more general class of correlators where two inserted operators are multiparticles. These can be derived with the same approach, suggesting that the structure found here is general. Published by the American Physical Society 2025
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引用次数: 0
Automatic Process Exploration through Machine Learning Assisted Transition State Searches
IF 8.6 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-03-04 DOI: 10.1103/physrevlett.134.096201
King Chun Lai, Patricia Poths, Sebastian Matera, Christoph Scheurer, Karsten Reuter
We present an efficient automatic process explorer (APE) framework to overcome the reliance on human intuition to empirically establish relevant elementary processes of a given system, e.g., in prevalent kinetic Monte Carlo (kMC) simulations based on fixed process lists. Use of a fuzzy machine learning classification algorithm minimizes redundancy in the transition-state searches by driving them toward hitherto unexplored local atomic environments. APE application to island diffusion at a Pd(100) surface immediately reveals a large number of, up to now, disregarded low-barrier collective processes that lead to a significant increase in the kMC-determined island diffusivity as compared to classic surface hopping and exchange diffusion mechanisms. Published by the American Physical Society 2025
我们提出了一种高效的自动过程探索器(APE)框架,以克服在基于固定过程列表的盛行动力学蒙特卡罗(kMC)模拟中,依赖人类直觉来根据经验确定给定系统的相关基本过程的问题。使用模糊机器学习分类算法可将过渡态搜索的冗余度降到最低,使其转向迄今为止尚未探索过的局部原子环境。将 APE 应用于 Pd(100) 表面的孤岛扩散,立即发现了大量迄今为止被忽视的低势垒集体过程,与经典的表面跳跃和交换扩散机制相比,这些过程导致 kMC 确定的孤岛扩散率显著增加。 美国物理学会出版 2025
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引用次数: 0
Exploring Single-Photon Recoil on Free Electrons
IF 8.6 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-03-04 DOI: 10.1103/physrevlett.134.096901
Alexander Preimesberger, Dominik Hornof, Theo Dorfner, Thomas Schachinger, Martin Hrtoň, Andrea Konečná, Philipp Haslinger
Recent advancements in time-resolved electron and photon detection enable novel correlative measurements of electrons and their associated cathodoluminescence (CL) photons within a transmission electron microscope. These studies are pivotal for understanding the underlying physics in coherent CL processes. We present experimental investigations of energy-momentum conservation on the single particle level, achieved through coincidence detection of electron-photon pairs. This not only enables unprecedented clarity in detecting weak signals otherwise obscured by nonradiative processes but also provides a new experimental pathway to investigate momentum-position correlations to explore entanglement within electron-photon pairs. Published by the American Physical Society 2025
{"title":"Exploring Single-Photon Recoil on Free Electrons","authors":"Alexander Preimesberger, Dominik Hornof, Theo Dorfner, Thomas Schachinger, Martin Hrtoň, Andrea Konečná, Philipp Haslinger","doi":"10.1103/physrevlett.134.096901","DOIUrl":"https://doi.org/10.1103/physrevlett.134.096901","url":null,"abstract":"Recent advancements in time-resolved electron and photon detection enable novel correlative measurements of electrons and their associated cathodoluminescence (CL) photons within a transmission electron microscope. These studies are pivotal for understanding the underlying physics in coherent CL processes. We present experimental investigations of energy-momentum conservation on the single particle level, achieved through coincidence detection of electron-photon pairs. This not only enables unprecedented clarity in detecting weak signals otherwise obscured by nonradiative processes but also provides a new experimental pathway to investigate momentum-position correlations to explore entanglement within electron-photon pairs. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"52 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143546085","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}
引用次数: 0
Four-Wave Mixing at peV Energy Scales.
IF 8.1 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-02-28 DOI: 10.1103/PhysRevLett.134.086705
C Simon, D M Silevitch, T F Rosenbaum

We measure the nonlinear magnetic susceptibility χ^{(3)} of the disordered quantum Ising magnet LiHo_{0.045}Y_{0.955}F_{4} and demonstrate four-wave mixing due to coherent (anti-)Stokes Raman scattering at ∼100  Hz (peV) energy scales. The temperature dependence of χ^{(3)} approximately follows a (1/T) form, with a high-T cutoff that can be linked to dissipation in the coherent spin clusters. χ^{(3)} also decreases monotonically with a transverse field, approaching a constant offset above a few kOe, suggesting the presence of both coherent and spontaneous Raman scattering.

{"title":"Four-Wave Mixing at peV Energy Scales.","authors":"C Simon, D M Silevitch, T F Rosenbaum","doi":"10.1103/PhysRevLett.134.086705","DOIUrl":"https://doi.org/10.1103/PhysRevLett.134.086705","url":null,"abstract":"<p><p>We measure the nonlinear magnetic susceptibility χ^{(3)} of the disordered quantum Ising magnet LiHo_{0.045}Y_{0.955}F_{4} and demonstrate four-wave mixing due to coherent (anti-)Stokes Raman scattering at ∼100  Hz (peV) energy scales. The temperature dependence of χ^{(3)} approximately follows a (1/T) form, with a high-T cutoff that can be linked to dissipation in the coherent spin clusters. χ^{(3)} also decreases monotonically with a transverse field, approaching a constant offset above a few kOe, suggesting the presence of both coherent and spontaneous Raman scattering.</p>","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"134 8","pages":"086705"},"PeriodicalIF":8.1,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630726","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}
引用次数: 0
Gauged Cooling of Topological Excitations and Emergent Fermions on Quantum Simulators.
IF 8.1 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-02-28 DOI: 10.1103/PhysRevLett.134.086503
Gilad Kishony, Mark S Rudner, Achim Rosch, Erez Berg

Simulated cooling is a robust method for preparing low-energy states of many-body Hamiltonians on near-term quantum simulators. In such schemes, a subset of the simulator's spins (or qubits) are treated as a "bath" that extracts energy and entropy from the system of interest. However, such protocols are inefficient when applied to systems whose excitations are highly nonlocal in terms of the microscopic degrees of freedom, such as topological phases of matter; such excitations are difficult to extract by a local coupling to a bath. We explore a route to overcome this obstacle by encoding the microscopic degrees of freedom into those of the quantum simulator in a nonlocal manner. To illustrate the approach, we show how to efficiently cool the ferromagnetic phase of the quantum Ising model, whose excitations are domain walls, via a "gauged cooling" protocol in which the Ising spins are coupled to a Z_{2} gauge field that simultaneously acts as a reservoir for removing excitations. We show that our protocol can prepare the ground states of the ferromagnetic and paramagnetic phases equally efficiently. The gauged cooling protocol naturally extends to (interacting) fermionic systems, where it is equivalent to cooling by coupling to a fermionic bath via single-fermion hopping.

{"title":"Gauged Cooling of Topological Excitations and Emergent Fermions on Quantum Simulators.","authors":"Gilad Kishony, Mark S Rudner, Achim Rosch, Erez Berg","doi":"10.1103/PhysRevLett.134.086503","DOIUrl":"https://doi.org/10.1103/PhysRevLett.134.086503","url":null,"abstract":"<p><p>Simulated cooling is a robust method for preparing low-energy states of many-body Hamiltonians on near-term quantum simulators. In such schemes, a subset of the simulator's spins (or qubits) are treated as a \"bath\" that extracts energy and entropy from the system of interest. However, such protocols are inefficient when applied to systems whose excitations are highly nonlocal in terms of the microscopic degrees of freedom, such as topological phases of matter; such excitations are difficult to extract by a local coupling to a bath. We explore a route to overcome this obstacle by encoding the microscopic degrees of freedom into those of the quantum simulator in a nonlocal manner. To illustrate the approach, we show how to efficiently cool the ferromagnetic phase of the quantum Ising model, whose excitations are domain walls, via a \"gauged cooling\" protocol in which the Ising spins are coupled to a Z_{2} gauge field that simultaneously acts as a reservoir for removing excitations. We show that our protocol can prepare the ground states of the ferromagnetic and paramagnetic phases equally efficiently. The gauged cooling protocol naturally extends to (interacting) fermionic systems, where it is equivalent to cooling by coupling to a fermionic bath via single-fermion hopping.</p>","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"134 8","pages":"086503"},"PeriodicalIF":8.1,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630729","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}
引用次数: 0
Nonorthogonal Eigenvectors, Fluctuation-Dissipation Relations, and Entropy Production.
IF 8.1 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-02-28 DOI: 10.1103/PhysRevLett.134.087102
Yan V Fyodorov, Ewa Gudowska-Nowak, Maciej A Nowak, Wojciech Tarnowski

Celebrated fluctuation-dissipation theorem (FDT) linking the response function to time dependent correlations of observables measured in the reference unperturbed state is one of the central results in equilibrium statistical mechanics. In this Letter we discuss an extension of the standard FDT to the case when multidimensional matrix representing transition probabilities is strictly non-normal. This feature dramatically modifies the dynamics, by incorporating the effect of eigenvector nonorthogonality via the associated overlap matrix of Chalker-Mehlig type. In particular, the rate of entropy production per unit time is strongly enhanced by that matrix. We suggest, that this mechanism has an impact on the studies of collective phenomena in neural matrix models, leading, via transient behavior, to such phenomena as synchronization and emergence of the memory. We also expect, that the described mechanism generating the entropy production is generic for wide class of phenomena, where dynamics is driven by non-normal operators. For the case of driving by a large Ginibre matrix the entropy production rate is evaluated analytically, as well as for the Rajan-Abbott model for neural networks.

著名的波动消散定理(FDT)将响应函数与在参考无扰动状态下测量的观测值的时间相关性联系起来,是平衡统计力学的核心成果之一。在这封信中,我们讨论了将标准 FDT 扩展到代表过渡概率的多维矩阵严格非正态分布的情况。通过相关的 Chalker-Mehlig 型重叠矩阵,将特征向量非正交性的影响纳入其中,这一特征极大地改变了动力学。特别是,单位时间内的熵产生率在该矩阵的作用下大大提高。我们认为,这种机制对神经矩阵模型中集体现象的研究有影响,它通过瞬态行为导致同步和记忆出现等现象。我们还预计,所描述的熵产生机制适用于由非正态算子驱动动力学的各类现象。对于由大型吉尼布雷矩阵驱动的情况,以及神经网络的拉詹-阿博特模型,我们对熵产生率进行了分析评估。
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引用次数: 0
Origin of Nonlinear Circular Photocurrent in 2D Semiconductor MoS_{2}.
IF 8.1 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-02-28 DOI: 10.1103/PhysRevLett.134.086201
Yanchong Zhao, Fengyu Chen, Jing Liang, Mohammad Saeed Bahramy, Mingwei Yang, Yao Guang, Xiaomei Li, Zheng Wei, Jian Tang, Jiaojiao Zhao, Mengzhou Liao, Cheng Shen, Qinqin Wang, Rong Yang, Kenji Watanabe, Takashi Taniguchi, Zhiheng Huang, Dongxia Shi, Kaihui Liu, Zhipei Sun, Ji Feng, Luojun Du, Guangyu Zhang

Nonlinear photogalvanic effects in two-dimensional materials, particularly the nonlinear circular photocurrents (NCPs) that belong to the helicity-dependent spin photocurrents, have sparked enormous research interest. Although notable progress has been witnessed, the underling origin of NCPs remains elusive. Here, we present systematic photocurrent characteristics, symmetry analysis and theoretical calculations to uncover the physical origin of NCPs in MoS_{2}, a prototypical 2D semiconductor. Our results show that the NCP responses in 2D semiconductor MoS_{2} result from the circular photon drag effect (CPDE), rather than the generally believed circular photogalvanic effect. Furthermore, we demonstrate that the NCPs are highly tunable with electrostatic doping and increase progressively with MoS_{2} thickness, evidencing the interlayer constructive nature of CPDE responses. Our Letter unravels the critical role of the previously overlooked CPDE contribution to NCPs, revolutionizing previous understanding and thus providing deep insights into further fundamental studies and technological advances in nonlinear photovoltaic and opto-spintronic devices.

二维材料中的非线性光电效应,尤其是属于螺旋相关自旋光电流的非线性环形光电流(NCP),引发了巨大的研究兴趣。尽管已经取得了显著的进展,但 NCPs 的根本原因仍然扑朔迷离。在此,我们提出了系统的光电流特征、对称性分析和理论计算,以揭示二维半导体原型 MoS_{2} 中 NCP 的物理起源。我们的研究结果表明,二维半导体 MoS_{2} 中的 NCP 响应源于环形光子拖曳效应 (CPDE),而非一般认为的环形光电效应。此外,我们还证明了 NCP 随静电掺杂而高度可调,并随 MoS_{2} 厚度的增加而逐渐增加,这证明了 CPDE 反应的层间构造性质。我们的信揭示了以前被忽视的 CPDE 对 NCP 的关键作用,彻底改变了以前的认识,从而为非线性光伏和光电自旋器件的进一步基础研究和技术进步提供了深刻的见解。
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引用次数: 0
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