Article
Materials Science, Multidisciplinary
Junpei Sonehara, Michael Kammermeier, Dai Sato, Daisuke Iizasa, Ulrich Zulicke, Shutaro Karube, Junsaku Nitta, Makoto Kohda
Summary: The anisotropic spin dynamics in wires based on a [001]-oriented semiconductor quantum well were investigated, revealing that the spin relaxation time is longest for the in-plane magnetic field perpendicular to the spin-orbit field, while the shortest for the parallel configuration. The precession frequency exhibits opposite symmetry, allowing for the evaluation of spin-orbit coefficients and a greater understanding of quantum and topological information in semiconductor one-dimensional wires.
Article
Nanoscience & Nanotechnology
Ch Uma Lavanya, Ashok Chatterjee
Summary: In this study, the persistent charge and spin currents in a one-dimensional mesoscopic ring were investigated using the Holstein-Hubbard model. The conventional Lang-Firsov transformation was used to eliminate phonon coordinates and the Bethe-Ansatz technique was applied to effectively solve the electronic Hamiltonian. Numerical solutions to the coupled transcendental equations were used to analyze the impact of electron-electron Coulomb correlation, electron-phonon interaction strength, and inter-site electron-phonon interaction strength on charge and spin currents at different electron fillings.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Multidisciplinary Sciences
K. L. Hudson, A. Srinivasan, O. Goulko, J. Adam, Q. Wang, L. A. Yeoh, O. Klochan, I Farrer, D. A. Ritchie, A. Ludwig, A. D. Wieck, J. von Delft, A. R. Hamilton
Summary: This study investigates a series of low disorder p-type GaAs quantum point contacts, exploring a new signature for detecting spin gaps that is insensitive to disorder. By examining the linear and non-linear response to the orientation of the applied magnetic field, the authors successfully extract a spin-orbit gap of approximately 500 microelectron volts.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Eyal Leviatan, David F. Mross
Summary: This study analyzes the vortex structure of electrons or spinful bosons on square lattices near half-filling and presents a compact gauge theory formulation for spinons and chargons. By implementing the duality and constructing parent Hamiltonians, the theory is validated.
Article
Materials Science, Multidisciplinary
Lina G. Johnsen, Jacob Linder
Summary: The spin transport inside an odd-frequency spin-triplet superconductor is different from that of a conventional superconductor, with unique symmetry properties and the potential for larger spin injection. When odd-frequency pairing inherits its temperature dependence from a conventional superconductor, the density of states can transition from gapless to gapped, leading to a peak in spin accumulation larger than in the normal state. In odd-frequency superconductors, the spin-orbit scattering time decreases below the superconducting transition temperature, particularly for energies close to the gap edge.
Article
Optics
Piotr Magierski, Bugra Tuzemen, Gabriel Wlazlowski
Summary: The motion of spin-polarized impurity in ultracold atomic gas is determined by a critical velocity, which correlates with the spin imbalance inside the impurity. The effective mass of the impurity in two dimensions is calculated, showing a scaling relationship with the impurity's surface area. The instability of impurities near a vortex is demonstrated as a significant impact of these findings.
Article
Materials Science, Multidisciplinary
Eirik Holm Fyhn, Jacob Linder
Summary: The theoretical study on spin pumping in bilayers suggests that the spin current is enhanced in superconductors compared to normal metals at temperatures close to critical temperatures and precession frequencies much lower than the gap, while it is suppressed otherwise. The detection of this effect experimentally is challenging due to the lower precession frequencies in superconductor/antiferromagnetic insulator compared to normal metal/antiferromagnetic insulator, suggesting a possible solution with shifting of resonance frequency by a static magnetic field.
Article
Physics, Multidisciplinary
Jongjun M. Lee, Masaki Oshikawa, Gil Young Cho
Summary: The study reveals that novel fermion liquids emerging from conducting networks exhibit a wide variety of non-Fermi liquid phenomena, which can be classified based on the characteristics of junctions in the network. The electric conductivity of these non-Fermi liquids shows markedly different scaling behaviors with temperature compared to a regular 2D Fermi liquid.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Shaozhi Li, Alberto Nocera, Umesh Kumar, Steven Johnston
Summary: The study investigates the role of oxygen degrees of freedom in high-temperature superconducting cuprates and their relevance to resonant inelastic x-ray scattering experiments. Results suggest that explicit inclusion of oxygen degrees of freedom is necessary to fully understand some experimental observations on cuprate materials.
COMMUNICATIONS PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Taku Matsushita, Ryosuke Shibatsuji, Katsuya Kurebayashi, Kazunori Amaike, Mitsunori Hieda, Nobuo Wada
Summary: Systematic nuclear magnetic resonance measurements were conducted on He-3 fluid formed in He-4-coated nanochannels, revealing the presence of a different type of Tomonaga-Luttinger (TL) liquid in the one-dimensional (1D) region. A dimensional crossover into the 1D state at low temperatures was observed, along with increases in the spin-spin relaxation time inversely proportional to temperature in the 1D region, indicating a characteristic property of the 1D He-3 fluid.
Article
Chemistry, Multidisciplinary
Ying Lu, Qian Wang, Ruyi Chen, Leilei Qiao, Foxin Zhou, Xia Yang, Dong Wang, Hui Cao, Wanli He, Feng Pan, Zhou Yang, Cheng Song
Summary: The study investigates spin-dependent charge transport properties in chiral bromide perovskites and finds that they can maintain good crystallinity even in oxidative, humid, and high-temperature environments, with a high spin filtration efficiency of up to 90%.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Xin He, Yan Wen, Chenhui Zhang, Peng Li, Dongxing Zheng, Aitian Chen, Aurelien Manchon, Xixiang Zhang
Summary: The study finds that the spin relaxation time in multilayer graphene is directly proportional to the momentum relaxation time, indicating that the Elliott-Yafet mechanism still dominates spin relaxation in multilayer graphene away from the charge neutrality point.
Article
Multidisciplinary Sciences
Xiaohu Zheng, Qiangqiang Gu, Yiyuan Liu, Bingbing Tong, Jian-Feng Zhang, Chi Zhang, Shuang Jia, Ji Feng, Rui-Rui Du
Summary: Scanning tunneling spectroscopy revealed the signature of Fermi arcs on the 1D ledges of a Weyl semimetal's surfaces, showcasing the bulk-boundary correspondence principle in action even at atomic scales. The study demonstrated the extreme robustness of this principle in providing topological protection for Fermi arcs, allowing for potential applications in miniaturized quantum devices.
NATIONAL SCIENCE REVIEW
(2022)
Article
Multidisciplinary Sciences
Alessio Filippetti, Payal Wadhwa, Claudia Caddeo, Alessandro Mattoni
Summary: The Rashba-Edelstein effect allows for the conversion of charge current into spin current, enabling control of electron charge and magnetization in magnetoelectric and magneto-optical devices. This effect is demonstrated in 3D lead-halide perovskites, where a strong charge-spin conversion is achieved due to spin-momentum locking, which can be tuned by the injected charge density. The study reveals the relationship between charge-spin conversion and the topological transition from low-density torus-shaped Fermi surfaces to high-density simply connected Fermi surfaces. The results suggest that lead-halide perovskites are promising materials for spin-orbitronic applications.
ADVANCED THEORY AND SIMULATIONS
(2023)
Article
Chemistry, Physical
Yawei Liu, Wenxing Yang, Qiaoli Chen, Zhaoxiong Xie, Tianquan Lian
Summary: This study investigates the distance-dependence of charge separation and charge recombination times in a model system of Pt-tipped CdS quantum dots and CdS nanorods, and its impact on photo-driven H2 production. The study reveals that the quantum efficiency of H2 generation and the lifetimes of electron transfer and charge recombination are influenced by the length of the nanorods, providing insights into the mechanism of photocatalytic H2 production.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Alireza Habibi, Ahmad Z. Musthofa, Elaheh Adibi, Johan Ekstrom, Thomas L. Schmidt, Eddwi H. Hasdeo
Summary: Integer quantum Hall (IQH) states and quantum anomalous Hall (QAH) states exhibit similar static dc response but different dynamical ac response. We found that the ac anomalous Hall conductivity profile sigma ( yx )(omega) of QAH states is sensitive to the band shape, and flattening the dispersive QAH bands can recover the sigma ( yx )(omega) of flat Landau bands in IQH. The sign change in the resonance profile is not caused by the band gap, but by the van Hove singularity energy of the QAH bands. These topological bands exhibit giant polarization rotation and ellipticity in reflected waves (Kerr effect) and rotation in transmitted waves (Faraday effect) with profiles resembling sigma ( yx )(omega).
NEW JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Eddwi H. Hasdeo, Edvin G. Idrisov, Thomas L. Schmidt
Summary: In this paper, we investigate Coulomb drag in bilayer systems and find that, in addition to the well-known kinematic and Hall viscosities, there are two new viscosity terms: the drag viscosity and the drag-Hall viscosity. These additional terms arise from changes in the stress tensor due to interlayer Coulomb interactions. By varying the applied magnetic field and electron densities in the two layers, all four viscosity terms can be tuned. At specific ratios of electron densities, the drag viscosity leads to a significant change in longitudinal transport, resulting in negative drag conductivity.
Article
Physics, Multidisciplinary
Andreas Bock Michelsen, Patrik Recher, Bernd Braunecker, Thomas L. Schmidt
Summary: Recent experiments have observed the effect of proximity coupling in a chiral quantum Hall (QH) edge state and an s-wave superconductor through Andreev reflection as a mediating process. We present a microscopic theory by modeling the system with a many-body Hamiltonian, incorporating an s-wave superconductor, spin-orbit coupling, and a magnetic field, coupled by electron tunneling to an integer QH edge state. We obtain an effective pairing Hamiltonian in the QH edge state by integrating out the superconductor. Our work clarifies the appearance of nonlocal superconducting correlations and predicts experimental signatures of Andreev reflection, such as electron-hole conversion suppression and negative resistance.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Andreas Haller, Solofo Groenendijk, Alireza Habibi, Andreas Michels, Thomas L. Schmidt
Summary: This study simulates the ground states of spin-1/2 Heisenberg lattices and discovers the presence of a quantum skyrmion lattice phase. Experimental detection methods are proposed, and the nonclassical nature of this phase is analyzed.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
Raphael L. R. C. Teixeira, Andreas Haller, Roshni Singh, Amal Mathew, Edvin G. Idrisov, Luis G. G. V. Dias da Silva, Thomas L. Schmidt
Summary: Parafermion bound states are generalizations of Majorana bound states with richer exchange statistics. The effective coupling Hamiltonian governing these states is determined by multiple interaction terms and finite-size effects can give rise to higher-order parafermion interactions.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Edvin G. Idrisov, Ivan P. Levkivskyi, Eugene Sukhorukov, Thomas L. Schmidt
Summary: The effects of Coulomb interactions in mesoscopic electron colliders based on quantum Hall edge states at filling factor ?? = 2 are studied using the nonequilibrium bosonization technique. The current cross correlations and Fano factor, which convey information about the exclusion statistics, are calculated. It is found that both quantities show a nonanalytical dependence on the source transparency, scaling as log(1/Ts) for small Ts << 1. This is attributed to electron-electron interactions in the outgoing nonequilibrium states of the collider.
Article
Optics
Kunmin Wu, Thomas L. Schmidt, M. Belen Farias
Summary: This study investigated the phenomenon of quantum friction when an atom moves parallel to a metallic plate, revealing that even without internal dissipation in the metal, quantum frictional force exists with a threshold relative velocity. The atom must move at a speed higher than the effective speed of sound in the material for friction to occur, a condition prominent near empty or filled bands where the Fermi velocity is low, as supported by analytical arguments at all orders in perturbation theory.
Article
Materials Science, Multidisciplinary
Jonas Koelzer, Kristof Moors, Abdur Rehman Jalil, Erik Zimmermann, Daniel Rosenbach, Lidia Kibkalo, Peter Schueffelgen, Gregor Mussler, Detlev Gruetzmacher, Thomas L. Schmidt, Hans Lueth, Thomas Schaepers
Summary: This study investigates the magnetotransport properties of three-terminal junctions in three-dimensional topological insulator nanoribbons, revealing that an in-plane magnetic field can affect the current flow direction, achieving a steering effect on the surface state current. This steering effect, originating from the orbital effect, breaks the left-right symmetry of the junction by trapping phase-coherent surface states in different branches on opposite sides of the nanoribbon.
COMMUNICATIONS MATERIALS
(2021)
