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Condensed Matter > Mesoscale and Nanoscale Physics
Title: Spin-charge conversion and current vortex in spin-orbit coupled systems
(Submitted on 11 Mar 2021 (v1), last revised 30 Jun 2021 (this version, v2))
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. 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 the 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- 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 spin-orbit-coupling Hamiltonian on the lattice is then introduced as the generator of the spin current.
Submission history
From: Junji Fujimoto [view email][v1] Thu, 11 Mar 2021 09:05:20 GMT (4285kb,D)
[v2] Wed, 30 Jun 2021 02:18:17 GMT (4286kb,D)
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