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Recognizing molecular chirality via twisted 2D materials 通过扭曲的二维材料识别分子手性
arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-09 DOI: arxiv-2409.05839
Lorenzo Cavicchi, Mayra Peralta, Álvaro Moreno, Maia Vergniory, Pablo Jarillo-Herrero, Claudia Felser, Giuseppe C. La Rocca, Frank H. L. Koppens, Marco Polini
{"title":"Recognizing molecular chirality via twisted 2D materials","authors":"Lorenzo Cavicchi, Mayra Peralta, Álvaro Moreno, Maia Vergniory, Pablo Jarillo-Herrero, Claudia Felser, Giuseppe C. La Rocca, Frank H. L. Koppens, Marco Polini","doi":"arxiv-2409.05839","DOIUrl":"https://doi.org/arxiv-2409.05839","url":null,"abstract":"Chirality pervades natural processes from the atomic to the cosmic scales,\u0000crucially impacting molecular chemistry and pharmaceutics. Traditional\u0000chirality sensing methods face challenges in sensitivity and efficiency,\u0000prompting the quest of novel chiral recognition solutions based on\u0000nanophotonics. In this work we theoretically investigate the possibility to\u0000carry out enantiomeric discrimination by measuring the spontaneous emission\u0000rate of chiral molecules on twisted two-dimensional materials. We first present\u0000a general theoretical framework based on dyadic Green's functions to calculate\u0000the chiral contribution to the decay rate in the presence of a generic chiral\u0000bilayer interface. We then combine this theory with density functional theory\u0000to obtain numerical estimates of the decay rate of helical bilayer nanographene\u0000molecules placed on top of twisted bilayer graphene.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":"432 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206770","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}
引用次数: 0
Unusual Phonon Thermal Transport Mechanisms in Monolayer Beryllene 单层铍中不寻常的声子热传输机制
arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-09 DOI: arxiv-2409.05766
Sapta Sindhu Paul Chowdhury, Santosh Mogurampelly
{"title":"Unusual Phonon Thermal Transport Mechanisms in Monolayer Beryllene","authors":"Sapta Sindhu Paul Chowdhury, Santosh Mogurampelly","doi":"arxiv-2409.05766","DOIUrl":"https://doi.org/arxiv-2409.05766","url":null,"abstract":"We compute the thermal conductivity of monolayer beryllene using the\u0000linearized phonon Boltzmann transport equation with interatomic force constants\u0000obtained from textit{ab-initio} calculations. Monolayer beryllene exhibits an\u0000impressive thermal conductivity of 270 W/m$cdot$K at room temperature,\u0000exceeding that of bulk beryllium by over 100%. Our study reveals a remarkable\u0000temperature-dependent behavior: $kappa sim T^{-2}$ at low temperatures,\u0000attributed to higher normal phonon-phonon scatterings, and $kappa sim T^{-1}$\u0000at high temperatures, due to Umklapp phonon interactions. Mode-specific\u0000analysis reveals that flexural phonons with longer lifetimes are the primary\u0000contributors to thermal conductivity, accounting for approximately 80%. This\u0000dominance results from their lower scattering rates in the out-of-plane\u0000direction due to a restricted phase space for scattering processes.\u0000Additionally, our findings highlight suppressed Umklapp scattering and reduced\u0000phase space for flexural modes, providing a thorough understanding of the eased\u0000thermal conductivity in monolayer beryllene and its potential for advanced\u0000thermal management applications.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206822","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}
引用次数: 0
Influence of Coulomb interaction on interband photogalvanic effect in semiconductors 库仑相互作用对半导体带间光电效应的影响
arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-09 DOI: arxiv-2409.05571
G. V. Budkin, E. L. Ivchenko
{"title":"Influence of Coulomb interaction on interband photogalvanic effect in semiconductors","authors":"G. V. Budkin, E. L. Ivchenko","doi":"arxiv-2409.05571","DOIUrl":"https://doi.org/arxiv-2409.05571","url":null,"abstract":"The ballistic and shift contributions to the interband linear photogalvanic\u0000effect are calculated in the same band structure model of a noncentrosymmetric\u0000semiconductor. The calculation uses a two-band generalized Dirac effective\u0000Hamiltonian with the off-diagonal components containing $mathbf{ k}$-dependent\u0000terms of the first and second order. The developed theory takes into account\u0000the Coulomb interaction between the photoexited electron and hole. It is shown\u0000that in typical semiconductors the ballistic photocurrent $j^{({rm bal})}$\u0000significantly exceeds the shift current $j^{({rm sh})}$: the ratio $j^{({rm\u0000sh})}/j^{({rm bal})}$ has the order of $a_B/ ell$, where $a_B$ is the Bohr\u0000radius and $ell$ is the mean free path of photocarriers due to their\u0000quasi-momentum scattering.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206771","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}
引用次数: 0
Breakdown of boundary criticality and exotic topological semimetals in $mathcal{P}mathcal{T}$-invariant systems $mathcal{P}mathcal{T}$不变系统中边界临界性的打破和奇异拓扑半金属
arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-09 DOI: arxiv-2409.05437
Hong Wu, Jun-Hong An
{"title":"Breakdown of boundary criticality and exotic topological semimetals in $mathcal{P}mathcal{T}$-invariant systems","authors":"Hong Wu, Jun-Hong An","doi":"arxiv-2409.05437","DOIUrl":"https://doi.org/arxiv-2409.05437","url":null,"abstract":"It was recently found that, going beyond the tendfold Altland-Zirnbauer\u0000symmetry classes and violating the bulk-boundary correspondence of the usual\u0000topological phases, PT-invariant systems support a real Chern insulator with\u0000the so-called boundary criticality, which forbids the transition between\u0000different orders of topological phases accompanied by the closing and reopening\u0000of the bulk-band gap. Here, we fnd that the periodic driving can break the\u0000boundary criticality of a PT-invariant system. Setting free from the the\u0000boundary criticality, diverse first- and second-order topological phases absent\u0000in the static case are found in both the zero and Pi/T modes. The application\u0000of our result in the three-dimensional PT-invariant system permits us to\u0000discover exotic second-order Dirac and nodal-line semimetals with coexisting\u0000surface and hinge Fermi arcs. Enriching the family of the topological phases in\u0000PT-invariant systems, our result provides us a useful way to explore novel\u0000topological phases.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226285","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}
引用次数: 0
Thermal with Electronic Excitation for the Unidirectional Rotation of a Molecule on Surface 表面分子单向旋转的热电子激发
arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-09 DOI: arxiv-2409.05485
Kwan Ho Au-Yeung, Suchetana Sarkar, Tim Kühne, Oumaima Aiboudi, Dmitry A. Ryndyk, Roberto Robles, Franziska Lissel, Nicolas Lorente, Christian Joachim, Francesca Moresco
{"title":"Thermal with Electronic Excitation for the Unidirectional Rotation of a Molecule on Surface","authors":"Kwan Ho Au-Yeung, Suchetana Sarkar, Tim Kühne, Oumaima Aiboudi, Dmitry A. Ryndyk, Roberto Robles, Franziska Lissel, Nicolas Lorente, Christian Joachim, Francesca Moresco","doi":"arxiv-2409.05485","DOIUrl":"https://doi.org/arxiv-2409.05485","url":null,"abstract":"Exploring the limits of the microscopic reversibility principle, we\u0000investigated the interplay between thermal and electron tunneling excitations\u0000for the unidirectional rotation of a molecule-rotor on the Au(111) surface. We\u0000identified a range of moderate voltages and temperatures where heating the\u0000surface enhances the unidirectional rotational rate of a chemisorbed DMNI-P\u0000rotor. At higher voltage, inelastic tunneling effects dominate while at higher\u0000temperature the process becomes stochastic. At each electron transfer event\u0000during tunneling, the quantum mixing of ground and excited electronic states\u0000brings part of the surface thermal energy in the excited electronic states of\u0000the molecule-rotor. Thermal energy contributes therefore to the semi-classical\u0000unidirectional rotation without contradicting the microscopic reversibility\u0000principle.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":"255 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206772","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}
引用次数: 0
Twisted bilayer graphene for enantiomeric sensing of chiral molecules 用于手性分子对映体传感的扭曲双层石墨烯
arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-08 DOI: arxiv-2409.05178
Álvaro Moreno, Lorenzo Cavicchi, Xia Wang, Mayra Peralta, Maia Vergniory, Kenji Watanabe, Takashi Taniguchi, Pablo Jarillo-Herrero, Claudia Felser, Marco Polini, Frank H. L. Koppens
{"title":"Twisted bilayer graphene for enantiomeric sensing of chiral molecules","authors":"Álvaro Moreno, Lorenzo Cavicchi, Xia Wang, Mayra Peralta, Maia Vergniory, Kenji Watanabe, Takashi Taniguchi, Pablo Jarillo-Herrero, Claudia Felser, Marco Polini, Frank H. L. Koppens","doi":"arxiv-2409.05178","DOIUrl":"https://doi.org/arxiv-2409.05178","url":null,"abstract":"Selective sensing of chiral molecules is a key aspect in fields spanning\u0000biology, chemistry, and pharmacology. However, conventional optical methods,\u0000such as circular dichroism (CD), encounter limitations owing to weak chiral\u0000light-matter interactions. Several strategies have been investigated to enhance\u0000CD or circularly polarised luminescence (CPL), including superchiral light,\u0000plasmonic nanoresonators and dielectric nanostructures. However, a compromise\u0000between spatial uniformity and high sensitivity, without requiring specific\u0000molecular functionalization, remains a challenge. In this work, we propose a\u0000novel approach using twisted bilayer graphene (TBG), a chiral 2D material with\u0000a strong CD peak which energy is tunable through the twist angle. By matching\u0000the CD resonance of TBG with the optical transition energy of the molecule, we\u0000achieve a decay rate enhancement mediated by resonant energy transfer that\u0000depends on the electric-magnetic interaction, that is, on the chirality of both\u0000the molecules and TBG. This leads to an enantioselective quenching of the\u0000molecule fluorescence, allowing to retrieve the molecule chirality from\u0000time-resolved photoluminescence measurements. This method demonstrates high\u0000sensitivity down to single layer of molecules, with the potential to achieve\u0000the ultimate goal of single-molecule chirality sensing, while preserving the\u0000spatial uniformity and integrability of 2D heterostructures.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206773","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}
引用次数: 0
Quantum intrinsic ${cal T}$-odd spin Hall effect in altermagnets 变磁体中的量子本征 ${cal T}$-odd 自旋霍尔效应
arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-08 DOI: arxiv-2409.05057
Miaomiao Wei, Longjun Xiang, Fuming Xu, Baigeng Wang, Jian Wang
{"title":"Quantum intrinsic ${cal T}$-odd spin Hall effect in altermagnets","authors":"Miaomiao Wei, Longjun Xiang, Fuming Xu, Baigeng Wang, Jian Wang","doi":"arxiv-2409.05057","DOIUrl":"https://doi.org/arxiv-2409.05057","url":null,"abstract":"Drude weight, historically associated with the longitudinal Drude\u0000conductivity, can be generalized to describe the transverse or Hall component\u0000of the extrinsic conductivity tensor. In particular, transverse Drude weights,\u0000such as band geometric quantities Berry curvature dipole and spin vorticity,\u0000manifest themselves through the textit{extrinsic} second-order nonlinear Hall\u0000effect and textit{extrinsic} linear spin Hall effect (SHE) in diffusive\u0000transport, respectively. In this work, we uncover a new class of intrinsic Hall\u0000effects in quantum transport regime, termed as quantum intrinsic Hall effect\u0000(QIHE), which is the manifestation of system symmetry through intrinsic\u0000transport phenomena. For a given Hamiltonian, its transport characteristics can\u0000be revealed either intrinsically through QIHE in ballistic regime or\u0000extrinsically via the transverse Drude weight in diffusive transport, where\u0000both intrinsic and extrinsic effects share the same salient transport features\u0000governed by symmetry of the Hamiltonian. The physical origin of QIHE is\u0000attributed to quantum boundary scattering of the measurement setup that\u0000respects the system symmetry, as exemplified by the contact resistance of a\u0000two-terminal ballistic conductor. We demonstrate our finding by studying the\u0000quantum ${cal T}$-odd ($mathcal{T}$, time-reversal) SHE in altermagnets. Our\u0000work paves a way towards the quantum transport manifestation of band geometric\u0000characteristics.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206778","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}
引用次数: 0
Room temperature synthesis of gallium oxide film with a fluidic exfoliation method 用流体剥离法室温合成氧化镓薄膜
arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-08 DOI: arxiv-2409.05173
Fengyu Xu, Jianyu Wang, Li Wang
{"title":"Room temperature synthesis of gallium oxide film with a fluidic exfoliation method","authors":"Fengyu Xu, Jianyu Wang, Li Wang","doi":"arxiv-2409.05173","DOIUrl":"https://doi.org/arxiv-2409.05173","url":null,"abstract":"Two-dimensional metal oxides play an important role in electronics and\u0000optoelectronics, and it is still a challenge to obtain thin oxides film. Here,\u0000a fluidic exfoliation method is applied to synthesis the metal oxides film by\u0000using galinstan as the reactant, and Ga2O3 film with ~1 cm size is obtained.\u0000Optical microscope and scanning electron microscope images show that the Ga2O3\u0000film is exfoliated from the galinstan without any droplets left. Energy\u0000Dispersive X-Ray measurements confirm the existence of the Ga2O3 film.\u0000Transmission electron microscope and selected area electron diffraction\u0000patterns indicate the oxidation process do not have a prior direction. The\u0000alloy liquid based fluidic exfoliation method in room temperature provide a\u0000promising route for the synthesis of two-dimensional mental oxides, which shows\u0000significant applications in electronic and photoelectronic devices.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206777","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}
引用次数: 0
Magnetic dichroism in darkfield UV photoemission electron microscopy 暗场紫外光发射电子显微镜中的磁二色性
arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-07 DOI: arxiv-2409.04771
Maximilian Paleschke, David Huber, Friederike Wührl, Cheng-Tien Chiang, Frank O. Schumann, Jürgen Henk, Wolf Widdra
{"title":"Magnetic dichroism in darkfield UV photoemission electron microscopy","authors":"Maximilian Paleschke, David Huber, Friederike Wührl, Cheng-Tien Chiang, Frank O. Schumann, Jürgen Henk, Wolf Widdra","doi":"arxiv-2409.04771","DOIUrl":"https://doi.org/arxiv-2409.04771","url":null,"abstract":"Photoemission electron microscopy (PEEM) has evolved into an indispensable\u0000tool for structural and magnetic characterization of surfaces at the nanometer\u0000scale. In strong contrast to synchrotron-radiation-based X-ray PEEM as a\u0000leading method for element-specific magnetic properties via magnetic circular\u0000dichroism (MCD), laboratory ultraviolet (UV) PEEM has seen limited application\u0000with much smaller dichroism effects for in-plane magnetization. Here we\u0000introduce darkfield PEEM as a novel approach to enhance MCD contrast in\u0000threshold photoemission, enabling efficient MCD imaging with significantly\u0000enhanced contrast by an order-of-magnitude for Fe(001). This advancement paves\u0000the way for MCD imaging on femtosecond timescales using modern lasers. The\u0000experimental results will be quantitatively benchmarked against advanced\u0000relativistic photoemission calculations.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":"61 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226286","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}
引用次数: 0
Dielectric and optical markers originated from quantum geometry 源于量子几何的介电和光学标记
arXiv - PHYS - Mesoscale and Nanoscale Physics Pub Date : 2024-09-07 DOI: arxiv-2409.04893
Wei Chen
{"title":"Dielectric and optical markers originated from quantum geometry","authors":"Wei Chen","doi":"arxiv-2409.04893","DOIUrl":"https://doi.org/arxiv-2409.04893","url":null,"abstract":"We elaborate that practically all the non-excitonic dielectric and optical\u0000properties of semiconductors and insulators are determined by the quantum\u0000metric of the valence band states, including charge susceptibility, relative\u0000dielectric constant, optical conductivity, dielectric function, refractive\u0000index, absorption coefficient, reflectance, and transmittance. The key to this\u0000recognition is the complex optical conductivity, which contains the quantum\u0000metric in the optical transition matrix element, and the fact that all these\u0000dielectric and optical properties can be expressed in terms of the real and\u0000imaginary parts of optical conductivity. Our formalism allows to map all these\u0000properties to real space lattice sites as local markers following the formalism\u0000of topological markers, enabling the effect of disorder on the propagation of\u0000electromagnetic wave in the nanometer scale to be investigated, as demonstrated\u0000by a minimal model of 3D topological insulators.","PeriodicalId":501137,"journal":{"name":"arXiv - PHYS - Mesoscale and Nanoscale Physics","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206776","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}
引用次数: 0
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