Article
Optics
Liang-Liang Wang, Wenjun Shao, Qing Sun, Jian Li
Summary: We investigate a fermionic superfluid with Raman-induced spin-orbit coupling immersed in a Bose-Einstein condensate. By minimizing the total free energy, we find that, with moderate repulsive interspecies interaction, a phase separation occurs where the otherwise nontopological uniform phase is divided into two parts: a purely fermionic one and a Bose-Fermi mix characterized by nontrivial topology with the winding number W = 1. We verify that Majorana zero modes emerge at the phase interfaces by numerical simulations of the coupled Bogoliubov-de Gennes and Gross-Pitaevskii equations in real space. The tunability of the phase interfaces enables a direct manipulation of the predicted Majorana zero modes.
Article
Optics
Peng Shi, Luping Du, Mingjie Li, Xiaocong Yuan
Summary: This research proposes a theoretical framework to show that photonic chiral spin textures in optical interfaces originate from the system's symmetry and relativity. The analysis of rotational symmetry in optical systems reveals the crucial role of the local spin momentum distribution in the chiral twisting of local spin vectors.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Zheng Gao, Lianyi He, Huaisong Zhao, Shi-Guo Peng, Peng Zou
Summary: We calculate the density dynamic structure factor of one-dimensional Fermi superfluid with Raman-type spin-orbit coupling and analyze its main dynamical characteristics during the phase transition between Bardeen-Cooper-Schrieffer superfluid and topological superfluid. Our results show four types of single-particle excitations induced by the two-branch structure of the single-particle spectrum, and the cross single-particle excitation is more easily observed in the spin dynamic structure factor at a small transferred momentum. Additionally, we observe a new rotonlike collective mode at a fixed transferred momentum q similar to 2(k)F, which only appears in the topological superfluid state.
Article
Materials Science, Multidisciplinary
Suik Cheon, Gil Young Cho, Ki-Seok Kim, Hyun-Woo Lee
Summary: This article discusses the possibility of realizing the chiral anomaly in noncentrosymmetric systems without pairs of Weyl points, where spin-orbit coupling induces nonzero Berry curvature flux through Fermi surfaces. This phenomenon affects both charge and spin transport properties, leading to the emergence of new physical effects.
Article
Materials Science, Multidisciplinary
Y. Avishai, Y. B. Band
Summary: This study focuses on the spin physics of electrons in single layer graphene under one-dimensional periodic potential and uniform Rashba spin-orbit coupling. Peculiar features relevant to graphene spintronics are discovered, such as the non-zero polarization of spin along the z direction perpendicular to the graphene plane.
Article
Physics, Multidisciplinary
Genwang Fan, Xiao-Long Chen, Peng Zou
Summary: In this theoretical study, we investigate the Higgs oscillation in a one-dimensional Raman-type spin-orbit-coupled Fermi superfluid using the time-dependent Bogoliubov-de Gennes equations. By linearly ramping or abruptly changing the effective Zeeman field in both the Bardeen-Cooper-Schrieffer state and the topological superfluid state, we find that the amplitude of the order parameter exhibits an oscillating behavior over time with two different frequencies. We further verify the existence of these two Higgs oscillations using a periodic ramp strategy with theoretically calculated driving frequency. Our predictions would be useful for further theoretical and experimental studies of these Higgs oscillations in spin-orbit-coupled systems.
FRONTIERS OF PHYSICS
(2022)
Article
Multidisciplinary Sciences
Yuki Hibino, Tomohiro Taniguchi, Kay Yakushiji, Akio Fukushima, Hitoshi Kubota, Shinji Yuasa
Summary: The study elucidates a mechanism behind the enhancement of magnetic-dependent charge-to-spin conversion in ferromagnetic materials, highlighting the dominant role of interfacial contribution and the potential for control via interfacial band engineering. It shows that the efficiency of charge-to-spin conversion in ferromagnets surpasses other materials with reduced symmetry.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Jian Feng, Wei-Wei Zhang, Liang-Wei Lin, Qi-Peng Cai, Yi-Cai Zhang, Sheng-Can Ma, Chao-Fei Liu
Summary: This paper investigates the topological superfluid phase diagram of a two-dimensional mass-imbalanced Fermi gas with Rashba spin-orbit coupling at zero temperature. The study finds a double-well structure in the thermodynamic potential due to the competition among mass imbalance, pairing interaction, and spin-orbit coupling, which affects the properties of the ground state. The phase diagrams are provided on the plane of spin-orbit coupling and chemical potential, as well as the plane of reduced mass ratio and two-body binding energy, offering a theoretical basis for better observation of topological superfluid state in experiments.
Article
Chemistry, Multidisciplinary
H. Rezania, M. Abdi, E. Nourian, B. Astinchap
Summary: In this study, the optical conductivity, dielectric constant, and optical coefficients of armchair phosphorene nanoribbons under biaxial and uniaxial strains were computed using the Kane-Mele model Hamiltonian. The effects of magnetic field, spin-orbit coupling, and strain on the optical properties were investigated. The results showed frequency dependence of optical absorption and refractive index, and the transmissivity and reflectivity of electromagnetic waves were determined for two media separated by a phosphorene-nanoribbon layer. The control of optical properties and the effects of spin-orbit coupling in phosphorene nanoribbons have potential applications in optoelectronics and condensed-matter physics.
Article
Optics
Jia-Zheng Sun
Summary: In this study, the fate of an impurity in a two-component, non-interacting Fermi gas under a non-Hermitian spin-orbit coupling is investigated. The impurity's spectral properties serve as an ideal probe to the dissipative Fermi gas in the background, showing that dissipation destabilizes polarons in favor of molecular formation. The dissipative nature of the Fermi gas leads to broadened peaks in the inverse radio-frequency spectra, providing potential signals for experimental observation.
EUROPEAN PHYSICAL JOURNAL D
(2021)
Article
Physics, Multidisciplinary
Xue-Jing Feng, Jin-Xin Li, Lu Qin, Ying-Ying Zhang, ShiQiang Xia, Lu Zhou, ChunJie Yang, ZunLue Zhu, Wu-Ming Liu, Xing-Dong Zhao
Summary: We investigate the influence of the anisotropic spin-orbit coupling (SOC) on the itinerant ferromagnetism in a dipolar Fermi atomic system. Our study reveals that both the anisotropy and magnitude of SOC play important roles in the ferromagnetism transition boundaries and the properties of the ground states. We propose a helpful scheme and quantum control method to overcome the difficulties in experimental observation, and further explore the existence of exotic Fermi surfaces and abnormal phase region by controlling the anisotropy of SOC.
FRONTIERS OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Jianfei Gu, Jingsan Hu, Weiyi Zhang
Summary: Graphene, an excellent two-dimensional material with high-mobility and relativistic electronic linear dispersion, has rich physical properties that have attracted great attention. However, its negligible intrinsic spin-orbit coupling strength due to light carbon atoms hinders its spintronic application. To enhance the spin-orbit coupling effect, a special deformation vector with chiral curvature can be introduced to mimic space warping and twisting, paving the way for graphene-based spintronic devices.
NEW JOURNAL OF PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Mengmeng Wei, Xiangqian Lu, Jiawei Qiao, Shenqiang Ren, Xiao-Tao Hao, Wei Qin
Summary: This study reports enantiomeric organic chiral ferrimagnets, where chirality is formed by the molecular torsion caused by the propeller-like arrangement of the donor and acceptor molecules. These materials could bridge the gap between ferromagnetism and antiferromagnetism, making them significant in the field of organic spintronics.
Article
Physics, Multidisciplinary
Juraj Hasik, Maarten Van Damme, Didier Poilblanc, Laurens Vanderstraeten
Summary: Starting from a simple spin-1/2 chiral frustrated Heisenberg model, it has been shown that a faithful representation of the chiral spin liquid phase is possible using a generic PEPS through variational optimization. This representation includes a perfectly chiral gapless edge mode and rapid decay of correlation functions at short distances, consistent with a bulk gap, along with a gossamer long-range tail originating from PEPS bulk-edge correspondence.
PHYSICAL REVIEW LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Jerome Gautier, Minghao Li, Thomas W. Ebbesen, Cyriaque Genet
Summary: This study presents a simple design of Fabry-Perot cavities with longitudinal chiral modes. By sandwiching a layer of polystyrene made planar chiral by torsional shear stress between two smooth metallic silver mirrors, the helicity-preserving features of the cavities are achieved through a spin-orbit coupling mechanism rooted in the specific chiroptical features of planar chirality. The extrinsic source of three-dimensional chirality under oblique illumination gives rise to enantiomorphic signatures of the cavities, which are experimentally measured and simulated with excellent agreement.
