Key laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources IMUST

Baotou, China

Key laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources IMUST

Baotou, China
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Liu J.,Inner Mongolia University of Science and Technology | Liu J.,Key laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources IMUST | Cheng J.,Inner Mongolia University of Science and Technology
Quantum Information Processing | Year: 2014

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. © 2014, Springer Science+Business Media New York.


Liu J.,Inner Mongolia University of Science and Technology | Liu J.,Key laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources IMUST | Wang S.,Inner Mongolia University of Science and Technology | du X.,Inner Mongolia University of Science and Technology
International Journal of Theoretical Physics | Year: 2016

Spin-dependent electron temperature effect on the spin pump in a single quantum dot connected to Normal and/or Ferromagnetic leads are investigated with the help of master equation method. Results show that spin heat accumulation breaks the tunneling rates balance at the thermal equilibrium state thus the charge current and the spin current are affected to some extent. Pure spin current can be obtained by adjusting pumping intensity or chemical potential of the lead. Spin heat accumulation of certain material can be detected by measuring the charge current strength in symmetric leads architectures. In practical devices, spin-dependent electron temperature effect is quite significant and our results should be useful in quantum information processing and spin Caloritronics. © 2016 Springer Science+Business Media New York


Wang S.,Inner Mongolia University of Science and Technology | Cheng J.,Inner Mongolia University of Science and Technology | Zhou Y.,Inner Mongolia University of Science and Technology | Liu J.,Inner Mongolia University of Science and Technology | Liu J.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources IMUST
International Journal of Theoretical Physics | Year: 2016

Temperature effect on the spin pump in a two-level Quantum Dot connects to Ferromagnetic and Normal leads is investigated with the help of master equation method. In addition, thermal bias, which is inevitable in practical devices, can also excite electron tunneling. Results show that the magnitude and the direction of the temperature difference between the source and drain leads have great impact on the spin current processes. By adjusting the spin pump strength, the thermal excitation currents and pumping currents can cancel each other out, thus a net spin-current without the accompany of charge-current can be obtained. In practical devices, the thermal bias is quite general and our results are helpful for the development of spintronics devices. © 2016, Springer Science+Business Media New York.


Liu J.,Inner Mongolia University of Science and Technology | Liu J.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources IMUST | Cheng J.,Inner Mongolia University of Science and Technology | Wang S.,Inner Mongolia University of Science and Technology
Physica B: Condensed Matter | Year: 2014

The control of the single electronic state in a quantum dot (QD) by magnetic field in the presence of thermal bias was investigated with a master equation method. Results show that the qubits for information processing can be realized by tuning the magnitude and direction of the magnetic field. In addition, the temperature difference between the source (S) and drain (D) leads, a thermal-spin effect, which is inevitable in practical devices, can also be counteracted with magnetic field. Our results have important implications for quantum information processing. © 2014 Elsevier B.V.


Liu J.,Inner Mongolia University of Science and Technology | Liu J.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources IMUST | Cheng J.,Inner Mongolia University of Science and Technology
Communications in Theoretical Physics | Year: 2014

Temperature effect on the spin pump in a single quantum dot (QD) connected to Normal (NM) and/or Ferromagnetic (FM) leads is investigated with the help of master equation method. Results show that the magnitude and the direction of the temperature difference between the source (L) and drain (R) leads have great impact on the spin current processes. In practical devices, the thermal bias is quite general and then our results may be useful in quantum information processing and spintronics. © 2014 Chinese Physical Society and IOP Publishing Ltd.


Liu J.,Inner Mongolia University of Science and Technology | Liu J.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources IMUST | Cheng J.,Inner Mongolia University of Science and Technology | Wang S.,Inner Mongolia University of Science and Technology
Physica Scripta | Year: 2014

The interactions of spin angular momentum and the external magnetic field in a quantum dot coupled to ferromagnetic lead have been considered here. The results show that the magnetic moment of spin precession caused by the direction of the external field changing could be used to adjust the coulomb gaps of quantum dots, and to control thermal-to-electron conversion efficiency or thermal-to-spin transformation efficiency. When the polarized directions of the ferromagnetic leads are opposite, it is possible to obtain a better thermal spin quality factor. So the system symmetry and Coulomb blockade effect limit the spin current of a quantum dot system. Our results are important to the design of quantum dot devices. © 2014 The Royal Swedish Academy of Sciences.


Liu J.,Inner Mongolia University of Science and Technology | Liu J.,Key laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources IMUST | Du X.-H.,Inner Mongolia University of Science and Technology
International Journal of Theoretical Physics | Year: 2013

The thermal entanglement in a two-qubit Heisenberg XXZ spin chain is investigated under a single pulse magnetic field B sin θ. The paper shows that the greater the contribution of the inhomogeneity on the exchange interaction, the higher thermal entanglement will be attained at the fixed temperature except the case that θ = 2kπ + 3/2π. Jz significantly disturb the thermal entanglement in uniform case. When the structure of the spin system are given, changing the external magnetic field B can induce controllable entanglement. Our study may provide a useful tool to change the entanglement of spin chain system. © 2013 Springer Science+Business Media New York.

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