scholarly journals Spin-Thermoelectric Effects in a Quantum Dot Hybrid System With Magnetic Insulator

2021 ◽  
Author(s):  
Piotr Trocha ◽  
Emil Siuda
Keyword(s):  
Quantum Dot ◽  
Thermoelectric Properties ◽  
Hybrid System ◽  
Spin Current ◽  
Coulomb Repulsion ◽  
Thermoelectric Effects ◽  
Metallic Lead ◽  
Basic Spin ◽  
Magnetic Insulator ◽  
Spin Conductance

Abstract We investigate spin thermoelectric properties of a hybrid system consisting of a single-level quantum dot attached to magnetic insulator and metal electrodes. Magnetic insulator is assumed to be of ferromagnetic type and is a source of magnons, whereas metallic lead is reservoir of electrons. The temperature gradient set between the magnetic insulator and metallic electrodes induces the spin current flowing through the system. The generated spin current of magnonic (electric) type is converted to electric (magnonic) spin current by means of quantum dot. Expanding spin and heat currents flowing through the system, up to linear order, we introduce basic spin thermoelectric coefficients including spin conductance, spin Seebeck and spin Peltier coefficients and heat conductance. We analyse the spin thermoelectric properties of the system in two cases: in the large ondot Coulomb repulsion limit and when these interactions are finite.

Spin thermoelectric transport in a four-quantum-dot ring: Influence of quantum dots magnetization

2018 ◽  
Vol 32 (33) ◽  
pp. 1850412 ◽  
Author(s):  
Feng Liang ◽  
Dong Zhang ◽  
Ben-Ling Gao ◽  
Yan-Zong Wang ◽  
Yu Gu
Keyword(s):  
Quantum Dots ◽  
Energy Level ◽  
Quantum Dot ◽  
Figure Of Merit ◽  
Spin Current ◽  
Pure Spin ◽  
Thermoelectric Effects ◽  
Thermoelectric Transport ◽  
Thermal Generator ◽  
Non Equilibrium Green’S Function

Non-equilibrium Green’s function method is applied to study the spin thermoelectric effects in a four-quantum-dot ring with two of the quantum dots magnetized. The influence of magnetic configuration on the spin thermoelectric transport through the system is investigated. In some magnetic configurations, a significant spin Seebeck coefficient [Formula: see text] can be generated with the variation of the quantum dot (QD) energy level. Appropriately tuning the QD energy level can let the present device work as a pure spin-up (spin-down) or a pure-spin-current thermal generator. The combined effect of the magnetization and magnetic flux (or Rashba spin-orbit coupling) is also investigated. Finally, the charge figure of merit [Formula: see text] and spin figure of merit [Formula: see text] are evaluated, it is found that the magnitude of the spin figure of merit can be comparable to that of the charge counterpart.

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 Corrigendum: One‐step Synthesis and Enhanced Thermoelectric Properties of Polymer–Quantum Dot Composite Films

2020 ◽  
Vol 59 (7) ◽  
pp. 2544-2544
Author(s):  
Wei Shi ◽  
Sanyin Qu ◽  
Hongyi Chen ◽  
Yanling Chen ◽  
Qin Yao ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Thermoelectric Properties ◽  
Composite Films ◽  
One Step

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
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