The spin-resolved non-equilibrium real-time electron transport through a
double-quantum-dot (DQD) Aharonov-Bohm (AB) interferometer with spin-orbit
interaction (SOI) is explored, using the solution to an exact master equation.
The SOI and AB interference in the real-time dynamics of spin transport is
expressed by effective magnetic fluxes. Analytical formulae for the
time-dependent currents, for initially unpolarized spins, are presented. In
many cases, there appear spin currents in the electrodes, for which the spins
in each electrode are polarized along characteristic directions, pre-determined
by the SOI parameters and by the geometry of the system. Special choices of the
system parameters yield steady-state currents in which the spins are fully
polarized along these characteristic directions. The time required to reach
this steady state depends on the couplings of the DQD to the leads. The
magnitudes of the currents depend strongly on the SOI-induced effective fluxes.
Without the magnetic flux, the spin-polarized current cannot be sustained to
the steady states, due to the phase rigidity for this system. For a
non-degenerate DQD, transient spin transport can be produced by the sole
effects of SOI. We also show that one can extract the spin-resolved currents
from measurements of the total charge current.
Description
Real-time dynamics of spin-dependent transport through a
double-quantum-dot Aharonov-Bohm interferometer with spin-orbit interaction
%0 Generic
%1 tu2014realtime
%A Tu, Matisse Wei-Yuan
%A Aharony, Amnon
%A Zhang, Wei-Min
%A Entin-Wohlman, Ora
%D 2014
%K Wei-Min Zhang
%T Real-time dynamics of spin-dependent transport through a
double-quantum-dot Aharonov-Bohm interferometer with spin-orbit interaction
%U http://arxiv.org/abs/1406.6258
%X The spin-resolved non-equilibrium real-time electron transport through a
double-quantum-dot (DQD) Aharonov-Bohm (AB) interferometer with spin-orbit
interaction (SOI) is explored, using the solution to an exact master equation.
The SOI and AB interference in the real-time dynamics of spin transport is
expressed by effective magnetic fluxes. Analytical formulae for the
time-dependent currents, for initially unpolarized spins, are presented. In
many cases, there appear spin currents in the electrodes, for which the spins
in each electrode are polarized along characteristic directions, pre-determined
by the SOI parameters and by the geometry of the system. Special choices of the
system parameters yield steady-state currents in which the spins are fully
polarized along these characteristic directions. The time required to reach
this steady state depends on the couplings of the DQD to the leads. The
magnitudes of the currents depend strongly on the SOI-induced effective fluxes.
Without the magnetic flux, the spin-polarized current cannot be sustained to
the steady states, due to the phase rigidity for this system. For a
non-degenerate DQD, transient spin transport can be produced by the sole
effects of SOI. We also show that one can extract the spin-resolved currents
from measurements of the total charge current.
@misc{tu2014realtime,
abstract = {The spin-resolved non-equilibrium real-time electron transport through a
double-quantum-dot (DQD) Aharonov-Bohm (AB) interferometer with spin-orbit
interaction (SOI) is explored, using the solution to an exact master equation.
The SOI and AB interference in the real-time dynamics of spin transport is
expressed by effective magnetic fluxes. Analytical formulae for the
time-dependent currents, for initially unpolarized spins, are presented. In
many cases, there appear spin currents in the electrodes, for which the spins
in each electrode are polarized along characteristic directions, pre-determined
by the SOI parameters and by the geometry of the system. Special choices of the
system parameters yield steady-state currents in which the spins are fully
polarized along these characteristic directions. The time required to reach
this steady state depends on the couplings of the DQD to the leads. The
magnitudes of the currents depend strongly on the SOI-induced effective fluxes.
Without the magnetic flux, the spin-polarized current cannot be sustained to
the steady states, due to the phase rigidity for this system. For a
non-degenerate DQD, transient spin transport can be produced by the sole
effects of SOI. We also show that one can extract the spin-resolved currents
from measurements of the total charge current.},
added-at = {2014-06-25T19:11:11.000+0200},
author = {Tu, Matisse Wei-Yuan and Aharony, Amnon and Zhang, Wei-Min and Entin-Wohlman, Ora},
biburl = {https://www.bibsonomy.org/bibtex/2ed6862a8d1b51417a08a6c5824aa6b1d/scavgf},
description = {Real-time dynamics of spin-dependent transport through a
double-quantum-dot Aharonov-Bohm interferometer with spin-orbit interaction},
interhash = {4093903c39679f52cc5333eb1bc5be9e},
intrahash = {ed6862a8d1b51417a08a6c5824aa6b1d},
keywords = {Wei-Min Zhang},
note = {cite arxiv:1406.6258Comment: 24 pages, 9 figures},
timestamp = {2014-06-25T19:11:11.000+0200},
title = {Real-time dynamics of spin-dependent transport through a
double-quantum-dot Aharonov-Bohm interferometer with spin-orbit interaction},
url = {http://arxiv.org/abs/1406.6258},
year = 2014
}