Conversion of equilibrium spin current into charge current through a quantum-dot spin valve subject to circularly polarized field

2015 ◽  
Vol 379 (47-48) ◽  
pp. 3114-3118 ◽  
Author(s):  
Feng Liang ◽  
Ben-Ling Gao ◽  
Guang Hu ◽  
Yu Gu ◽  
Ning Xu
Keyword(s):  
Quantum Dot ◽  
Spin Valve ◽  
Spin Current ◽  
Circularly Polarized ◽  
Charge Current

scholarly journals PUMPING CURRENT IN A QUANTUM DOT BY AN OSCILLATING MAGNETIC FIELD

2007 ◽  
Vol 21 (23n24) ◽  
pp. 4284-4288 ◽  
Author(s):  
ZHAO YANG ZENG ◽  
HONG LI ◽  
BAOWEN LI
Keyword(s):  
Magnetic Field ◽  
Quantum Dot ◽  
Current Flow ◽  
Spin Current ◽  
Rate Equations ◽  
Time Varying ◽  
Charge Current ◽  
Occupation Numbers ◽  
Experimental Parameters ◽  
Oscillating Magnetic Field

We investigate spin and charge current through a quantum dot pumped by a time-varying magnetic field. Using the density matrix method, quantum rate equations for the electronic occupation numbers in the quantum dot are obtained and solved in the stationary state limit for a wide set of parameters. Both charge and spin currents are expressed explicitly in terms of several relevant parameters and analyzed in detail. The results suggest a way of optimizing experimental parameters to obtain an maximal spin current without the charge current flow.

scholarly journals Large Voltage-Tunable Spin Valve Based on a Double Quantum Dot

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Patrycja Tulewicz ◽  
Kacper Wrześniewski ◽  
Szabolcs Csonka ◽  
Ireneusz Weymann
Keyword(s):  
Quantum Dot ◽  
Spin Valve ◽  
Double Quantum ◽  
Double Quantum Dot

scholarly journals Anomalous spin Hall and inverse spin Hall effects in magnetic systems

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
X. R. Wang
Keyword(s):  
Hall Effect ◽  
Order Parameter ◽  
Spin Current ◽  
Spin Hall Effect ◽  
Magnetic Systems ◽  
Charge Current ◽  
Spin Currents ◽  
Tensor Quantity ◽  
Hall Effects ◽  
Spin Hall Effects

AbstractSpin current is a very important tensor quantity in spintronics. However, the well-known spin-Hall effect (SHE) can only generate a few of its components whose propagating and polarization directions are perpendicular with each other and to an applied charge current. It is highly desirable in applications to generate spin currents whose polarization can be in any possible direction. Here anomalous SHE and inverse spin-Hall effect (ISHE) in magnetic systems are predicted. Spin currents, whose polarisation and propagation are collinear or orthogonal with each other and along or perpendicular to the charge current, can be generated, depending on whether the applied charge current is along or perpendicular to the order parameter. In anomalous ISHEs, charge currents proportional to the order parameter can be along or perpendicular to the propagating or polarization directions of the spin current.

scholarly journals Spin-current-induced charge current

2005 ◽  
Vol 71 (12) ◽  
Author(s):  
Soon-wook Jung ◽  
Hyun-Woo Lee
Keyword(s):  
Spin Current ◽  
Charge Current ◽  
Induced Charge

SPIN-DEPENDENT BEATS CREATED BY IRRADIATION OF MICROWAVE FIELD THROUGH A QUANTUM DOT

2011 ◽  
Vol 25 (25) ◽  
pp. 2033-2039
Author(s):  
M. BAGHERI TAGANI ◽  
H. RAHIMPOUR SOLEIMANI
Keyword(s):  
Magnetic Field ◽  
Quantum Dot ◽  
Microwave Field ◽  
Spin Current ◽  
Tunneling Magnetoresistance ◽  
Rate Equations ◽  
Spin Accumulation ◽  
Spin Dependent Transport ◽  
Field Temperature ◽  
Dependent Transport

We study spin-dependent transport through a quantum dot with Zeeman split levels coupled to ferromagnetic leads and under influence of microwave irradiation. Current polarization, spin current, spin accumulation and tunneling magnetoresistance are analyzed using nonequilibrium Green's function formalism and rate equations. Spin-dependent beats in spin resolved currents are observed. The effects of magnetic field, temperature and Coulomb interaction on these beats are studied.

scholarly journals Effect of the low-resistance tunnel barriers induced inhomogeneous spin current distribution in graphene crossed configuration lateral spin valve

AIP Advances ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 115005
Author(s):  
Yanping Liu ◽  
Cheng Zeng ◽  
Junnan Ding ◽  
Jiahong Zhong ◽  
Yuanji Gao ◽  
...  
Keyword(s):  
Current Distribution ◽  
Spin Valve ◽  
Spin Current ◽  
Low Resistance ◽  
Tunnel Barriers ◽  
Inhomogeneous Spin

Thermally driven pure spin current through an interacting quantum dot

2020 ◽  
Vol 384 (24) ◽  
pp. 126607
Author(s):  
Hua Zhao ◽  
Xiaowei Zhang ◽  
Xiaochun Liu ◽  
Zhongqin Yang
Keyword(s):  
Quantum Dot ◽  
Spin Current ◽  
Pure Spin ◽  
Thermally Driven

scholarly journals Normal electric field enhanced light-induced polarizations and magnetic detection of valley polarization in silicene

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
N. Shahabi ◽  
A. Phirouznia
Keyword(s):  
Electric Field ◽  
Light Emission ◽  
Polarized Light ◽  
Spin Current ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Normal Electric Field ◽  
Valley Polarization ◽  
Population Imbalance ◽  
Magnetic Detection

Abstract The role of staggered potential on light-induced spin and pseudo-spin polarization has been investigated in silicene. It has been shown that non-equilibrium spin and pseudo-spin polarizations are emerged in silicene sheet by applying an external perpendicular electric field in the presence of circularly polarized light emission. This electric field results in pseudo-spin resolved states very close to the Dirac points therefore could be considered as a pseudomagnetic field. It has been shown that staggered potential induced spin-valley locking and pseudo-spin resolved bands are responsible for the enhancement of the spin and pseudo-spin polarizations. Meanwhile, spin-valley locking suggests a coexistence of both spin and valley polarizations with nearly identical (or at least proportional) population imbalance at low Fermi energies which could be employed for magnetic detection of the valley polarization. It has been shown that spin-valley locking results in the protection of the spin polarizations against the relaxations in elastic scattering regime. In addition, the results indicate that the pseudo-spin current can be generated by the circularly polarized light which could be explained by asymmetric light absorption of the states in k-space.

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