External magnetic field on the thermoelectric and thermospin effect in a quantum dot

Liu, Jia; Cheng, Jie; Wang, Song

doi:10.1088/0031-8949/89/8/085701

Cited by 5 publications

(1 citation statement)

References 31 publications

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“…It is a significant development of spintronics from the generation of spin-polarized current [1][2][3][4][5][6][7][8] to that of pure spin current, [9][10][11][12][13][14][15][16] which has been extensively researched both experimentally and theoretically because of the possible applications in information storage and processing. On the other hand the spin current can be also used to manipulate the magnetization orientation of a single-molecule magnet (SMM), which is believed to be a promised candidate for the future information-storage devices.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field manipulation of spin current in a single-molecule magnet tunnel junction with two-electron Coulomb interaction

et al. 2018

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In this work, we study the generation of spin-current in a single-molecule magnet (SMM) tunnel junction with Coulomb interaction of transport electrons and external magnetic field. In the absence of field the spin-up and -down currents are symmetric with respect to the initial polarizations of molecule. The existence of magnetic field breaks the time-reversal symmetry, which leads to unsymmetrical spin currents of parallel and antiparallel polarizations. Both the amplitude and polarization direction of spin current can be controlled by the applied magnetic field. Particularly when the magnetic field increases to a certain value the spin-current with antiparallel polarization is reversed along with the magnetization reversal of the SMM. The two-electron occupation indeed enhances the transport current compared with the single-electron process. However the increase of Coulomb interaction results in the suppression of spin-current amplitude at the electron-hole symmetry point. We propose a scheme to compensate the suppression with the magnetic field.

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Section: Introductionmentioning

confidence: 99%

Magnetic field manipulation of spin current in a single-molecule magnet tunnel junction with two-electron Coulomb interaction

et al. 2018

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Thermal Bias on the Pumped Spin-Current in a Two-Level Quantum Dot

et al. 2016

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A quantum dot spin qubit with thermal bias

Liu

Cheng

2014

Quantum Inf Process

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Temperature effect on the spin manipulation and spin injection in a quantum dot is investigated with the help of master equation method. Results show that the magnitude and the direction of the temperature difference between the source and drain leads have great impact on the spin store, writing, and reading processes. In practical devices, the thermal bias is quite general and then our results may be useful in quantum information processing and spintronics.Keywords Thermal bias · Spin injector · Quantum information processing · Quantum dot Spin-based electronics has been a hotspot because of its various application prospects [1,2]. Due to the progress of nanotechnology, electronic devices based on electron spin can be designed according to the requirements to reduce energy consumption. Due to the well-defined Hilbert space, spin is the natural candidate among various microscopic degrees of freedom to be considered for the preparation of qubits for information storage, writing, and reading, etc., to realize quantum communication and computation. How to manipulate spin while keeping the spin state unchanged according to the requirements, is a critical issue [3][4][5]. In recent years, isolated quantum dots (QDs) spin states in solid-state system have been recognized as one of the most promising candidate for a quantum bit, which is the basic requirement for quantum

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External magnetic field on the thermoelectric and thermospin effect in a quantum dot

Cited by 5 publications

References 31 publications

Magnetic field manipulation of spin current in a single-molecule magnet tunnel junction with two-electron Coulomb interaction

Magnetic field manipulation of spin current in a single-molecule magnet tunnel junction with two-electron Coulomb interaction

Thermal Bias on the Pumped Spin-Current in a Two-Level Quantum Dot

A quantum dot spin qubit with thermal bias

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