Tailoring the quantum many-body interactions in layered materials through appropriate heterostructure engineering can result in emergent properties that are absent in the constituent materials thus promising potential future applications. In this article, we have demonstrated controlling the otherwise robust magnetic properties of transition metal phosphorus trisulphides (Mn/Fe/NiPS3) in their heterostructures with Weyl semimetallic MoTe2 which can be attributed to the Dzyaloshinskii Moriya (DM) interactions at the interface of the two different layered materials. While the DM interaction is known to scale with the strength of the spin-orbit coupling (SOC), we also demonstrate here that the effect of DM interaction strongly varies with the spin orientation/dimensionality of the magnetic layer and the low-energy electronic density of state of the spin-orbit coupled layer. The observations are further supported by a series of experiments on heterostructures with a variety of substrates/underlayers hosting variable SOC and electronic density of states.
{"title":"Tuning the magnetic properties in MPS3 (M = Mn, Fe, and Ni) by proximity-induced Dzyaloshinskii Moriya interactions","authors":"Suvodeep Paul, Devesh Negi, Saswata Talukdar, Saheb Karak, Shalini Badola, Bommareddy Poojitha, Manasi Mandal, Sourav Marik, R. P. Singh, Nashra Pistawala, Luminita Harnagea, Aksa Thomas, Ajay Soni, Subhro Bhattacharjee, Surajit Saha","doi":"arxiv-2307.13400","DOIUrl":"https://doi.org/arxiv-2307.13400","url":null,"abstract":"Tailoring the quantum many-body interactions in layered materials through\u0000appropriate heterostructure engineering can result in emergent properties that\u0000are absent in the constituent materials thus promising potential future\u0000applications. In this article, we have demonstrated controlling the otherwise\u0000robust magnetic properties of transition metal phosphorus trisulphides\u0000(Mn/Fe/NiPS3) in their heterostructures with Weyl semimetallic MoTe2 which can\u0000be attributed to the Dzyaloshinskii Moriya (DM) interactions at the interface\u0000of the two different layered materials. While the DM interaction is known to\u0000scale with the strength of the spin-orbit coupling (SOC), we also demonstrate\u0000here that the effect of DM interaction strongly varies with the spin\u0000orientation/dimensionality of the magnetic layer and the low-energy electronic\u0000density of state of the spin-orbit coupled layer. The observations are further\u0000supported by a series of experiments on heterostructures with a variety of\u0000substrates/underlayers hosting variable SOC and electronic density of states.","PeriodicalId":501259,"journal":{"name":"arXiv - PHYS - Atomic and Molecular Clusters","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138542705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Multi-particle thermal Casimir interactions are investigated, mostly in terms of the Casimir entropy, from the point of view based on multiple-scattering processes. The geometry of the scattering path is depicted in detail, and the contributions from different types of channels, namely the transverse, longitudinal and mixing channels, are demonstrated. The geometry of the path can strongly influence the weight of each channel in the path. Negativity and nonmonotonicity are commonly seen in the multi-particle Casimir entropy, the sources of which are diverse, including the geometry of the path, the types of polarization mixing, the polarizability of each particle, etc. Thermal contributions from multi-particle scatterings can be significant in the system, while the zero-temperature multi-particle scattering effects are insignificant. Limiting behaviors from a multi-particle configuration to a continuum are briefly explored.
{"title":"Thermal Casimir interactions in multi-particle systems: scattering channel approach","authors":"Yang Li, Kimball A. Milton, Iver Brevik","doi":"arxiv-2307.10570","DOIUrl":"https://doi.org/arxiv-2307.10570","url":null,"abstract":"Multi-particle thermal Casimir interactions are investigated, mostly in terms\u0000of the Casimir entropy, from the point of view based on multiple-scattering\u0000processes. The geometry of the scattering path is depicted in detail, and the\u0000contributions from different types of channels, namely the transverse,\u0000longitudinal and mixing channels, are demonstrated. The geometry of the path\u0000can strongly influence the weight of each channel in the path. Negativity and\u0000nonmonotonicity are commonly seen in the multi-particle Casimir entropy, the\u0000sources of which are diverse, including the geometry of the path, the types of\u0000polarization mixing, the polarizability of each particle, etc. Thermal\u0000contributions from multi-particle scatterings can be significant in the system,\u0000while the zero-temperature multi-particle scattering effects are insignificant.\u0000Limiting behaviors from a multi-particle configuration to a continuum are\u0000briefly explored.","PeriodicalId":501259,"journal":{"name":"arXiv - PHYS - Atomic and Molecular Clusters","volume":"62 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138522879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. V. Ilyushin, H. S. P. Müller, J. K. Jørgensen, S. Bauerecker, C. Maul, R. Porohovoi, E. A. Alekseev, O. Dorovskaya, F. Lewen, S. Schlemmer, R. M. Lees
Solar-type prestellar cores and protostars display large amounts of deuterated organic molecules. Recent findings on CHD$_2$OH and CD$_3$OH toward IRAS 16293-2422 suggest that even fully deuterated methanol, CD$_3$OD, may be detectable as well. However, searches for CD$_3$OD are hampered in particular by the lack of intensity information from a spectroscopic model. The objective of the present investigation is to develop a spectroscopic model of CD$_3$OD in low-lying torsional states that is sufficiently accurate to facilitate searches for this isotopolog in space. We carried out a new measurement campaign for CD$_3$OD involving two spectroscopic laboratories that covers the 34 GHz-1.1 THz range. A torsion-rotation Hamiltonian model based on the rho-axis method was employed for our analysis. Our resulting model describes the ground and first excited torsional states of CD$_3$OD well up to quantum numbers $J leq 51$ and $K_a leq 23$. We derived a line list for radio-astronomical observations from this model that is accurate up to at least 1.1 THz and should be sufficient for all types of radio-astronomical searches for this methanol isotopolog. This line list was used to search for CD$_3$OD in data from the Protostellar Interferometric Line Survey of IRAS 16293$-$2422 obtained with the Atacama Large Millimeter/submillimeter Array. While we found several emission features that can be attributed largely to CD$_3$OD, their number is still not sufficiently high enough to establish a clear detection. Nevertheless, the estimate of 2$times 10^{15}$ cm$^{-2}$ derived for the CD$_3$OD column density may be viewed as an upper limit that can be compared to column densities of CD$_3$OH, CH$_3$OD, and CH$_3$OH. The comparison indicates that the CD$_3$OD column density toward IRAS 16293-2422 is in line with the enhanced D/H ratios observed for multiply deuterated complex organic molecules.
{"title":"Investigation of the rotational spectrum of CD$_3$OD and an astronomical search toward IRAS 16293$-$2422","authors":"V. V. Ilyushin, H. S. P. Müller, J. K. Jørgensen, S. Bauerecker, C. Maul, R. Porohovoi, E. A. Alekseev, O. Dorovskaya, F. Lewen, S. Schlemmer, R. M. Lees","doi":"arxiv-2307.07801","DOIUrl":"https://doi.org/arxiv-2307.07801","url":null,"abstract":"Solar-type prestellar cores and protostars display large amounts of\u0000deuterated organic molecules. Recent findings on CHD$_2$OH and CD$_3$OH toward\u0000IRAS 16293-2422 suggest that even fully deuterated methanol, CD$_3$OD, may be\u0000detectable as well. However, searches for CD$_3$OD are hampered in particular\u0000by the lack of intensity information from a spectroscopic model. The objective\u0000of the present investigation is to develop a spectroscopic model of CD$_3$OD in\u0000low-lying torsional states that is sufficiently accurate to facilitate searches\u0000for this isotopolog in space. We carried out a new measurement campaign for\u0000CD$_3$OD involving two spectroscopic laboratories that covers the 34 GHz-1.1\u0000THz range. A torsion-rotation Hamiltonian model based on the rho-axis method\u0000was employed for our analysis. Our resulting model describes the ground and\u0000first excited torsional states of CD$_3$OD well up to quantum numbers $J leq\u000051$ and $K_a leq 23$. We derived a line list for radio-astronomical\u0000observations from this model that is accurate up to at least 1.1 THz and should\u0000be sufficient for all types of radio-astronomical searches for this methanol\u0000isotopolog. This line list was used to search for CD$_3$OD in data from the\u0000Protostellar Interferometric Line Survey of IRAS 16293$-$2422 obtained with the\u0000Atacama Large Millimeter/submillimeter Array. While we found several emission\u0000features that can be attributed largely to CD$_3$OD, their number is still not\u0000sufficiently high enough to establish a clear detection. Nevertheless, the\u0000estimate of 2$times 10^{15}$ cm$^{-2}$ derived for the CD$_3$OD column density\u0000may be viewed as an upper limit that can be compared to column densities of\u0000CD$_3$OH, CH$_3$OD, and CH$_3$OH. The comparison indicates that the CD$_3$OD\u0000column density toward IRAS 16293-2422 is in line with the enhanced D/H ratios\u0000observed for multiply deuterated complex organic molecules.","PeriodicalId":501259,"journal":{"name":"arXiv - PHYS - Atomic and Molecular Clusters","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138522873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The impulsive limit (the "sudden approximation") has been widely employed to describe the interaction between molecules and short, far-off-resonant laser pulses. This approximation assumes that the timescale of the laser--molecule interaction is significantly shorter than the internal rotational period of the molecule, resulting in the rotational motion being instantaneously "frozen" during the interaction. This simplified description of laser-molecule interaction is incorporated in various theoretical models predicting rotational dynamics of molecules driven by short laser pulses. In this theoretical work, we develop an effective theory for ultrashort laser pulses by examining the full time-evolution operator and solving the time-dependent Schr"odinger equation at the operator level. Our findings reveal a critical angular momentum, $l_mathrm{crit}$, at which the impulsive limit breaks down. In other words, the validity of the sudden approximation depends not only on the pulse duration, but also on its intensity, since the latter determines how many angular momentum states are populated. We explore both ultrashort multi-cycle (Gaussian) pulses and the somewhat less studied half-cycle pulses, which produce distinct effective potentials. We discuss the limitations of the impulsive limit and propose a new method that rescales the effective matrix elements, enabling an improved and more accurate description of laser-molecule interactions.
{"title":"Modeling laser pulses as $δ$-kicks: reevaluating the impulsive limit in molecular rotational dynamics","authors":"Volker Karle, Mikhail Lemeshko","doi":"arxiv-2307.07256","DOIUrl":"https://doi.org/arxiv-2307.07256","url":null,"abstract":"The impulsive limit (the \"sudden approximation\") has been widely employed to\u0000describe the interaction between molecules and short, far-off-resonant laser\u0000pulses. This approximation assumes that the timescale of the laser--molecule\u0000interaction is significantly shorter than the internal rotational period of the\u0000molecule, resulting in the rotational motion being instantaneously \"frozen\"\u0000during the interaction. This simplified description of laser-molecule\u0000interaction is incorporated in various theoretical models predicting rotational\u0000dynamics of molecules driven by short laser pulses. In this theoretical work,\u0000we develop an effective theory for ultrashort laser pulses by examining the\u0000full time-evolution operator and solving the time-dependent Schr\"odinger\u0000equation at the operator level. Our findings reveal a critical angular\u0000momentum, $l_mathrm{crit}$, at which the impulsive limit breaks down. In other\u0000words, the validity of the sudden approximation depends not only on the pulse\u0000duration, but also on its intensity, since the latter determines how many\u0000angular momentum states are populated. We explore both ultrashort multi-cycle\u0000(Gaussian) pulses and the somewhat less studied half-cycle pulses, which\u0000produce distinct effective potentials. We discuss the limitations of the\u0000impulsive limit and propose a new method that rescales the effective matrix\u0000elements, enabling an improved and more accurate description of laser-molecule\u0000interactions.","PeriodicalId":501259,"journal":{"name":"arXiv - PHYS - Atomic and Molecular Clusters","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138522876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Patrick J. Edwards, Sean Stuart, James T. Farmer, Ran Shi, Run Long, Oleg V. Prezhdo, Vitaly V. Kresin
Nanostructured electronic devices, such as those based on graphene, are typically grown on top of the insulator SiO2. Their exposure to a flux of small size-selected silver nanoparticles has revealed remarkably selective adhesion: the graphene channel can be made fully metallized while the insulating substrate remains coverage-free. This conspicuous contrast derives from the low binding energy between the metal nanoparticles and a contaminant-free passivated silica surface. In addition to providing physical insight into nanoparticle adhesion, this effect may be of value in applications involving deposition of metallic layers on device working surfaces: it eliminates the need for masking the insulating region and the associated extensive and potentially deleterious pre- and postprocessing.
{"title":"Substrate-Selective Adhesion of Metal Nanoparticles to Graphene Devices","authors":"Patrick J. Edwards, Sean Stuart, James T. Farmer, Ran Shi, Run Long, Oleg V. Prezhdo, Vitaly V. Kresin","doi":"arxiv-2307.06407","DOIUrl":"https://doi.org/arxiv-2307.06407","url":null,"abstract":"Nanostructured electronic devices, such as those based on graphene, are\u0000typically grown on top of the insulator SiO2. Their exposure to a flux of small\u0000size-selected silver nanoparticles has revealed remarkably selective adhesion:\u0000the graphene channel can be made fully metallized while the insulating\u0000substrate remains coverage-free. This conspicuous contrast derives from the low\u0000binding energy between the metal nanoparticles and a contaminant-free\u0000passivated silica surface. In addition to providing physical insight into\u0000nanoparticle adhesion, this effect may be of value in applications involving\u0000deposition of metallic layers on device working surfaces: it eliminates the\u0000need for masking the insulating region and the associated extensive and\u0000potentially deleterious pre- and postprocessing.","PeriodicalId":501259,"journal":{"name":"arXiv - PHYS - Atomic and Molecular Clusters","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138522874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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