Spin-current rectification in the presence of spin-flip in a quantum dot using temperature bias

2012 ◽  
Vol 250 (1) ◽  
pp. 128-133 ◽  
Author(s):  
M. Bagheri Tagani ◽  
H. Rahimpour Soleimani
Keyword(s):  
Quantum Dot ◽  
Spin Current ◽  
Temperature Bias ◽  
Spin Flip ◽  
Current Rectification

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.

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 Giant Spin Current Rectification Due to the Interplay of Negative Differential Conductance and a Non-Uniform Magnetic Field

Entropy ◽  
2020 ◽  
Vol 22 (11) ◽  
pp. 1311
Author(s):  
Kang Hao Lee ◽  
Vinitha Balachandran ◽  
Ryan Tan ◽  
Chu Guo ◽  
Dario Poletti
Keyword(s):  
Magnetic Field ◽  
Uniform Magnetic Field ◽  
Spin Current ◽  
System Size ◽  
Differential Conductance ◽  
Many Body ◽  
Negative Differential Conductance ◽  
Ferromagnetic Domains ◽  
Current Rectification ◽  
High Degree

In XXZ chains with large enough interactions, spin transport can be significantly suppressed when the bias of the dissipative driving becomes large enough. This phenomenon of negative differential conductance is caused by the formation of two oppositely polarized ferromagnetic domains at the edges of the chain. Here, we show that this many-body effect, combined with a non-uniform magnetic field, can allow for a high degree of control of the spin current. In particular, by studying all of the possible shapes of local magnetic fields potentials, we find that a configuration in which the magnetic field points up for half of the chain and down for the other half, can result in giant spin-current rectification, for example, up to 108 for a system with only 8 spins. Our results show clear indications that the rectification can increase with the system size.

scholarly journals Spin-flip quenching in trion state mediated by optical phonons in a single quantum dot

2009 ◽  
Vol 246 (4) ◽  
pp. 775-778 ◽  
Author(s):  
H. Kumano ◽  
S. Ekuni ◽  
H. Kobayashi ◽  
H. Sasakura ◽  
I. Suemune ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Optical Phonons ◽  
Single Quantum ◽  
Spin Flip ◽  
Single Quantum Dot

Spin current in double quantum dot

2004 ◽  
Vol 13 (6) ◽  
pp. 938-941 ◽  
Author(s):  
Zhao Hua ◽  
Zhang Guo-Feng ◽  
Yin Wen ◽  
Liang Jiu-Qing
Keyword(s):  
Quantum Dot ◽  
Spin Current ◽  
Double Quantum ◽  
Double Quantum Dot
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