Effects of the Spin Heat Accumulation on the Heat Generation in a Quantum Dot Coupled to Leads

2017 ◽  
Vol 190 (1-2) ◽  
pp. 67-77
Author(s):  
Jia Liu ◽  
Yun Zhou ◽  
Feng Chi ◽  
Yong-Hong Ma
Keyword(s):  
Quantum Dot ◽  
Heat Generation ◽  
Heat Accumulation ◽  
Spin Heat Accumulation

scholarly journals Spin Seebeck Effect in a Hybridized Quantum-Dot/Majorana-Nanowire With Spin Heat Accumulation

2021 ◽  
Vol 9 ◽  
Author(s):  
Lian-Liang Sun ◽  
Zhen-Guo Fu
Keyword(s):  
Quantum Dot ◽  
Spin Polarization ◽  
High Efficiency ◽  
Seebeck Effect ◽  
Heat Accumulation ◽  
Topological Superconductor ◽  
Semiconductor Nanowire ◽  
Spin Seebeck Effect ◽  
Spin Polarized ◽  
Spin Heat Accumulation

Properties of spin Seebeck effect (SSE) in a quantum dot (QD) connected to a topological superconductor or semiconductor nanowire with strong spin-orbit interaction are theoretically studied by the noneqilibrium Green’s function method combined with Dyson equation technique. At low temperatures, Majorana zero modes (MZMs) are prepared at the ends of topological superconductor or semiconductor nanowire, and are hybridized to the QD with spin-dependent strength. We consider that the QD is coupled to two leads in the presence of spin heat accumulation (SHA), i.e., spin-dependent temperature in the leads. We find that the thermopower is spin-polarized when the hybridization strength between the QD and one mode of the MZMs depends on electron spin direction, and its spin-polarization can be effectively adjusted by changing the magnitude of SHA. By proper variation of the spin-polarization of the QD-MZM hybridization strength, magnitude of the SHA, dot level, or the direct coupling between the MZMs, 100% spin-polarized or pure thermopower can be generated. Our results may find real usage in high efficiency spintronic devices or detection of the MZMs, which are under current extensive study. The present model is within the reach of current nano-technologies and may by used in high efficiency spin caloritronics devices.

scholarly journals Spin Heat Accumulation Induced by Tunneling from a Ferromagnet

2014 ◽  
Vol 112 (5) ◽  
Author(s):  
I. J. Vera-Marun ◽  
B. J. van Wees ◽  
R. Jansen
Keyword(s):  
Heat Accumulation ◽  
Spin Heat Accumulation

Heat generation by spin-polarized current in a quantum dot connected to spin battery and ferromagnetic lead

2015 ◽  
Vol 24 (5) ◽  
pp. 057302
Author(s):  
Xu-Fang Bai ◽  
Lian-Liang Sun ◽  
Feng Chi
Keyword(s):  
Quantum Dot ◽  
Heat Generation ◽  
Spin Polarized ◽  
Ferromagnetic Lead

scholarly journals Dual Negative Differential of Heat Generation in a Strongly Correlated Quantum Dot Side-Coupled to Majorana Bound States

2021 ◽  
Vol 9 ◽  
Author(s):  
Zhu-Hua Wang ◽  
Wen-Cheng Huang
Keyword(s):  
Quantum Dot ◽  
Heat Generation ◽  
Coulomb Blockade ◽  
Bound States ◽  
Interaction Strength ◽  
Local Heat ◽  
Transport Processes ◽  
Strongly Correlated ◽  
Majorana Bound States ◽  
Coulomb Blockade Regime

We study theoretically the properties of local heat originated from energy exchange between electrons passing through a quantum dot (QD) coupled to a phonon bath. The dot is sandwiched between two normal metal leads and also side-coupled to Majorana bound states (MBSs) formed at opposite ends of a topological superconductor nanowire. We find that in addition to the negative differential of heat generation (NDHG) in the Coulomb blockade regime, another NDHG emerges near the leads’ Fermi level due to the dot-MBS coupling. This dual NDHG effect is robust against the variation of intradot Coulomb interaction strength, and disappears if the QD is coupled to regular Fermions. Direct hybridization between the MBSs reduces their impacts on the electronic transport processes, and eliminates the dual NDHG effect. Our results show that the dual NDHG effect is quite efficient for inferring the existence of MBSs, and may remedy some limitations of the detection schemes relying on tunneling spectroscopy technique.

scholarly journals Heat Generation by Electrical Current in a Quantum Dot Hybridized to Majorana Nanowires

2021 ◽  
Vol 9 ◽  
Author(s):  
Zhu-Hua Wang
Keyword(s):  
Quantum Dot ◽  
Bias Voltage ◽  
Heat Generation ◽  
Bound States ◽  
Waste Heat ◽  
Electrical Current ◽  
Function Technique ◽  
Heat Current ◽  
Low Dimensional ◽  
Direct Hybridization

Heat current generated by electronic transport through a quantum dot (QD) coupled to both a phonon bath and a Majorana nanowire hosting Majorana bound states (MBSs) is theoretically studied in the framework of non-equilibrium Green’s function technique. The calculated numerical results show that electrical current can be either enhanced or suppressed by the combined influences of the phonon bath and the MBSs at certain bias voltage regimes. The enhancement and suppression of the current’s magnitude for a fixed bias voltage will be reversed due to the direct hybridization between the MBSs. The simultaneous coupling between both MBSs will amplify the function of the MBSs on the current, with the same unchanged and essential qualitative impacts. Heat generation by the electrical current can be fully adjusted by the dot–MBS coupling, direct hybridization between the MBSs, and positions of the dot level. By properly choosing the above parameters, heat generation can be suppressed even for increased electrical current, which is favorable in removing waste heat generated by electrical current flowing through low-dimensional circuits.

The current-induced heat generation in a quantum dot with Andreev-Fano resonance

2019 ◽  
Vol 126 (19) ◽  
pp. 195101
Author(s):  
Feng Jiang ◽  
Yonghong Yan ◽  
Shikuan Wang ◽  
Yijing Yan
Keyword(s):  
Quantum Dot ◽  
Heat Generation ◽  
Fano Resonance

Heat generation by spin-polarized current in a quantum-dot spin battery

2015 ◽  
Vol 379 (6) ◽  
pp. 613-618 ◽  
Author(s):  
Feng Chi ◽  
Lian-Liang Sun ◽  
Jun Zheng ◽  
Yu Guo
Keyword(s):  
Quantum Dot ◽  
Heat Generation ◽  
Spin Polarized
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