Spin–charge conversion and current vortex in spin–orbit coupled systems
Source abstract
Abstract
Using response theory, we calculate the charge current vortex generated by spin pumping at a point-like contact in a system with Rashba spin–orbit coupling (SOC). We discuss the spatial profile of the current density for finite temperature and for the zero-temperature limit. The main observation is that the Rashba spin precession leads to a charge current that oscillates as a function of distance from the spin pumping source, which is confirmed by numerical simulations. In our calculations, we consider a Rashba model on a square lattice, for which we first review the basic properties related to charge and spin transport. In particular, we define the charge current and spin current operators for the tight-binding Hamiltonian as the currents coupled linearly with the U(1) and SU(2) gauge potentials, respectively. By analogy to the continuum model, the SOC Hamiltonian on the lattice is then introduced as the generator of the spin current.
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Research context
OpenAlex topics: Quantum and electron transport phenomena · Physics of Superconductivity and Magnetism · Magnetic properties of thin films
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences 1 , Beijing 100190, China
Institut für Physik, Universität Greifswald 2 , 17489 Greifswald, Germany
RIKEN Cluster for Pioneering Research (CPR) 3 , Wako, Saitama 351-0198, Japan
RIKEN Center for Computational Science (R-CCS) 4 , Kobe, Hyogo 650-0047, Japan
RIKEN Center for Quantum Computing (RQC) 5 , Wako, Saitama 351-0198, Japan
RIKEN Center for Emergent Matter Science (CEMS) 6 , Wako, Saitama 351-0198, Japan
Funding
Chinese Academy of Sciences · Deutsche Forschungsgemeinschaft · Core Research for Evolutional Science and Technology · Ministry of Education, Culture, Sports, Science and Technology
References (29)
Show source-provided references
1. Spin Hall effect10.1103/physrevlett.83.1834 ↗
2. Dissipationless quantum spin current at room temperature10.1126/science.1087128 ↗
3. Universal intrinsic spin Hall effect10.1103/physrevlett.92.126603 ↗
4. Observation of the spin Seebeck effect10.1038/nature07321 ↗
5. Effects of mechanical rotation on spin currents10.1103/physrevlett.106.076601 ↗
6. Spin hydrodynamic generation10.1038/nphys3526 ↗
7. Spin current generation using a surface acoustic wave generated via spin-rotation coupling10.1103/physrevlett.119.077202 ↗
8. Spin Hall effects10.1103/revmodphys.87.1213 ↗
9. Generation of current vortex by spin current in Rashba systems10.1103/physrevlett.126.157202 ↗
10. Properties of a 2D electron gas with lifted spectral degeneracy
11. Numerical study of symmetry effects on localization in two dimensions10.1103/physrevb.40.5325 ↗
12. 2000
13. Proper definition of spin current in spin-orbit coupled systems10.1103/physrevlett.96.076604 ↗
14. Dzyaloshinskii-Moriya interaction as a consequence of a Doppler shift due to spin-orbit-induced intrinsic spin current10.1103/physrevlett.116.247201 ↗
15. Spin currents in thermodynamic equilibrium: The challenge of discerning transport currents10.1103/physrevb.68.241315 ↗
16. Edge-spin accumulation in semiconductor two-dimensional hole gases10.1103/physrevb.72.245330 ↗
17. Spin accumulation in the extrinsic spin Hall effect10.1103/physrevb.72.241303 ↗
18. Nonlocal spin-charge conversion via Rashba spin-orbit interaction10.1103/physrevb.99.054407 ↗
19. Electronic structure of primary solid solutions in metals10.1080/00018735400101233 ↗
20. Indirect exchange coupling of nuclear magnetic moments by conduction electrons10.1103/physrev.96.99 ↗
21. A theory of metallic ferro- and antiferromagnetism on Zener’s model10.1143/ptp.16.45 ↗
22. Magnetic properties of Cu-Mn alloys10.1103/physrev.106.893 ↗
23. Lanczos transformation for quantum impurity problems in d-dimensional lattices: Application to graphene nanoribbons10.1103/physrevb.88.245113 ↗
24. Tuning spin-orbit coupling and superconductivity at the SrTiO3/LaAlO3 interface: A magnetotransport study10.1103/physrevlett.104.126802 ↗
25. Subband structure of a two-dimensional electron gas formed at the polar surface of the strong spin-orbit perovskite KTaO310.1103/physrevlett.108.117602 ↗
26. Giant spin splitting through surface alloying10.1103/physrevlett.98.186807 ↗
27. Wide-range ideal 2D Rashba electron gas with large spin splitting in Bi2Se3/MoTe2 heterostructure10.1038/s41524-017-0011-5 ↗
28. Rashba effect and enriched spin-valley coupling in GaX/MX2 (M = Mo, W; X = S, Se, Te) heterostructures10.1103/physrevb.97.155415 ↗
29. Spin polarization of conduction electrons induced by electric current in two-dimensional asymmetric electron systems10.1016/0038-1098(90)90963-c ↗