Article
Physics, Multidisciplinary
Wenguo Zhu, Huadan Zheng, Yongchun Zhong, Jianhui Yu, Zhe Chen
Summary: This research demonstrates a novel wave-vector-varying PB phase that naturally arises in transmission and reflection processes for paraxial beams with small incident angles. This new photonic spin Hall effect can address the contradiction between spin separation and energy efficiency in the conventional PSHE.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Hui Yang, Junjie Zeng, Yulei Han, Zhenhua Qiao
Summary: We investigated the localization mechanisms of the quantum anomalous Hall effect in bilayer graphene and magnetic topological insulator thin films with different types of disorder. We found that the phase transition behaviors in the two systems are completely different when different types of disorder are present.
Article
Optics
Victor V. Kotlyar, Alexey A. Kovalev
Summary: We investigate a simple paraxial vector beam and show that it has zero spin angular momentum at certain distances, but becomes non-zero at all other distances. The intensity distribution of the beam has lobes on a circle with a certain radius, while the spin angular momentum distribution has lobes on a smaller circle. The sign of the spin angular momentum alternates between lobes.
Article
Chemistry, Physical
Yuanyuan Miao, Dan Li, Huiqing Zhang, Junfeng Ren, Guichao Hu
Summary: Using an extended Su-Schrieffer-Heeger model and a nonadiabatic dynamics method, this study investigates the dynamics of bipolarons in coupled nondegenerate organic chains. The results reveal an oscillating spin Hall effect (SHE) from the bipolaron transport, with a reduction of amplitude and an increase of oscillating frequency compared to polaron-dominated transport. The mechanism is attributed to enhanced skew scattering caused by larger transient deformations of the chains in the case of the bipolaron. Spectrum analysis of the SHE signal demonstrates a distinct shift of two characteristic peaks to a higher onset frequency compared to polaron transport.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Physics, Applied
Michael Balinskiy, Howard Chiang, David Gutierrez, Alexander Khitun
Summary: This experiment demonstrates a spin wave interference detection using an inverse spin Hall effect (ISHE). By controlling the phase difference between two spin waves, oscillations in ISHE voltage can be observed. The experimental results show the potential of using ISHE to convert spin wave phase into an electric signal.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Wouter Beugeling
Summary: The quantum spin Hall effect is a result of band inversion in topological insulators, leading to helical edge channels with finite spin Hall conductivity. A generalized notion of spin Hall conductivity is discussed in this work, where a block structure is defined in the more general k . p model using the concept of isoparity, which remains a conserved quantity under various conditions, especially in the presence of a perpendicular external magnetic field. Isoparity, fundamentally defined as the action of z -> -z on spatial and spinorial degrees of freedom, allows for the identification of two uncoupled blocks in the Hamiltonian matrix, acting as Kramers partners due to time reversal anticommutation. This approach uncovers the true meaning of 'spin' as a crystal symmetry realized by a spinorial representation.
Article
Astronomy & Astrophysics
Kazuya Mameda, Naoki Yamamoto, Di-Lun Yang
Summary: Based on quantum field theory, we have developed the Wigner function and quantum kinetic theory for polarized photons in curved spacetimes. In a rigidly rotating coordinate, we can reproduce the photonic chiral/zilch vortical effects. In a spatially inhomogeneous coordinate, we derive the spin Hall effect for the photon helicity current and energy current in equilibrium. Our derivation reveals the relationship between these photonic Hall effects and the photonic vortical effect, and their transport coefficients match each other.
Article
Nanoscience & Nanotechnology
Sara Catalano, Juan M. Gomez-Perez, M. Xochitl Aguilar-Pujol, Andrey Chuvilin, Marco Gobbi, Luis E. Hueso, Felix Casanova
Summary: Spin Hall magnetoresistance (SMR) is a reference tool used to investigate the magnetic properties of materials, but realistic surfaces may lead to unexpected artifacts in SMR due to defects and disorder. This study discovers that the SMR-like signal in heterostructures is generated by strong interfacial disorder, challenging the widespread assumption on the role of disorder in SMR measurements.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Multidisciplinary
Federico Carlini, Nicolas Cherroret
Summary: It has been discovered that the coherent mode of light propagating in transversely disordered media, known as coherent mode, exhibits an optical spin Hall effect (SHE). However, in non-resonant materials, this phenomenon appears at a larger spatial scale than the mean free path, making it challenging to observe due to the exponential attenuation of the coherent mode. In this study, we demonstrate that in disordered photonic arrays with Mie resonances, the SHE appears at a smaller scale than the mean free path if operated near the lowest transverse-magnetic resonance of the array. With weak measurement and cooperative emission, a giant SHE that can be observed in optically-thin media is achieved. Additionally, a time-dependent SHE observable at large optical thicknesses can be achieved by exploiting the cooperative emission of a flash of light following the abrupt extinction of the incoming beam.
Article
Chemistry, Analytical
Alexey A. A. Kovalev, Victor V. V. Kotlyar, Anton G. G. Nalimov
Summary: We investigate a paraxial vector Gaussian beam with an infinite number of polarization singularities residing evenly on a straight line. The polarization singularities only exist in the initial plane and in the far field. Upon propagation in free space, an infinite number of C-points is generated, where polarization is circular. Generating alternating areas with positive and negative spin angular momentum (SAM) density manifests the optical spin Hall effect.
Article
Materials Science, Multidisciplinary
Huan Wang, Xiao-Ping Ma, Xiang-Yu Zeng, Jing Gong, Jun-Fa Lin, Xiao-Yan Wang, Zheng-Yi Dai, Kun Han, Yi-Ting Wang, Tian-Long Xia
Summary: The recent discoveries of large anomalous Hall effect (AHE) and topological Hall effect (THE) in antiferromagnets have led to intense study in theories and experiments. In this study, the magnetic and electrical transport properties of a layered antiferromagnet V0.3NbS2 were investigated. The material showed antiferromagnetic order below 53 K and exhibited weak magnetic hysteresis with a small net magnetization along the c axis. AHE was observed in this antiferromagnet, which is of particular interest due to the near-perfect cancellation of moment. THE was also detected at low temperatures, acting as a probe for spin reorientation in the magnetization process induced by field. This study provides a platform for studying AHE in antiferromagnets.
Article
Multidisciplinary Sciences
Xiaokang Li, Jahyun Koo, Zengwei Zhu, Kamran Behnia, Binghai Yan
Summary: The anomaly and topological hall effects are both related to berry curvature, which can be found in both momentum space and real space. In this study, Li et al present a unique example of a combined berry curvature in Mn3Sn, which leads to a large field linear anomalous Hall effect. They find that the spin chirality induced by the magnetic field modifies the band structure topology and explains the observed anomalous Hall effect.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Lin Huang, Yongjian Zhou, Hongsong Qiu, Hua Bai, Chong Chen, Weichao Yu, Liyang Liao, Tingwen Guo, Feng Pan, Biaobing Jin, Cheng Song
Summary: The inverse spin Hall effect (ISHE) has been investigated in Mn2Au/[Co/Pd] heterostructures, showing that the direction of the Neel vector has a significant impact on the ISHE signal. This finding not only expands the study of the Hall effect, but also enhances the flexibility of antiferromagnetic spintronics.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jino Im, Choong H. Kim, Hosub Jin
Summary: This study reveals that polar lattice distortion can directly couple to the Berry curvature (BC) dipole of phonons, leading to a switchable nonlinear phonon Hall effect. They observed the phononic version of the BC memory effect and the phonon Rashba effect in a SnS monolayer, where in-plane ferroelectricity induces a phonon BC and opens a mass gap in tilted Weyl phonon modes. Furthermore, their ab initio non-equilibrium molecular dynamics simulations demonstrate controllable nonlinear phonon Hall transport via ferroelectric switching.
Article
Materials Science, Multidisciplinary
Jin-Xin Hu, Ying-Ming Xie, K. T. Law
Summary: Recently, the existence of topological flat bands and the occurrence of the spin Hall effect have been confirmed in AB-stacked MoTe2/WSe2 heterostructures. This study focuses on investigating the effects of Berry curvature in moiré transition metal dichalcogenide (TMD) heterobilayers. The authors found that the moiré potential of the remote conduction bands generates a periodic pseudomagnetic field (PMF) on the valence band, resulting in net Berry curvature flux in each valley of the moiré Brillouin zone. The combination of Berry curvature and spin-valley locking leads to the observed spin Hall effect. Additionally, the valley-contrasting Berry curvature distribution can be detected through shift currents induced by linearly polarized light. This work provides insights into the novel quantum phenomena induced by Berry curvature in moiré TMD heterobilayers.
Article
Mechanics
M. Mehrafarin
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2018)
Article
Astronomy & Astrophysics
Hamideh Balajany, Mohammad Mehrafarin
MODERN PHYSICS LETTERS A
(2018)
Article
Physics, Multidisciplinary
Hamideh Balajany, Mohammad Mehrafarin
Article
Physics, Multidisciplinary
R. Torabi, M. Mehrafarin
Article
Physics, Multidisciplinary
Fatemeh Ahmadi, Mohammad Mehrafarin
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2012)
Article
Physics, Multidisciplinary
N. Ebrahimian, M. Mehrafarin
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2013)
Article
Physics, Condensed Matter
Mohammad Mehrafarin, Shima Gholam-Mirzaei
PHYSICA B-CONDENSED MATTER
(2011)
Article
Physics, Condensed Matter
N. Ebrahimian, M. Mehrafarin, R. Afzali
PHYSICA B-CONDENSED MATTER
(2012)
Article
Physics, Applied
N. Ebrahimian, M. Mehrafarin, R. Afzali
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
(2012)
Article
Physics, Fluids & Plasmas
Mohammad Mehrafarin
Article
Quantum Science & Technology
Fatemeh Ahmadi, Mohammad Mehrafarin
QUANTUM INFORMATION PROCESSING
(2014)
Article
Astronomy & Astrophysics
Hamideh Balajany, Mohammad Mehrafarin
GRAVITATION & COSMOLOGY
(2019)
Article
Astronomy & Astrophysics
Mansoureh Hoseini, Mohammad Mehrafarin
Article
Astronomy & Astrophysics
Mansoureh Hoseini, Mohammad Mehrafarin
Article
Physics, Multidisciplinary
Tinggui Chen, Baizhan Xia, Dejie Yu, Chuanxing Bi
Summary: This study proposes a gradient phononic crystal structure for enhanced acoustic sensing. By breaking the symmetry of the PC structure, topologically protected edge states are introduced, resulting in topological acoustic rainbow trapping. The robustness and enhancement properties are verified numerically and experimentally.
