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Chin. Phys. B, 2017, Vol. 26(3): 037304    DOI: 10.1088/1674-1056/26/3/037304
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Photon-mediated spin-polarized current in a quantum dot under thermal bias

Feng Chi(迟锋)1, Liming Liu(刘黎明)1, Lianliang Sun(孙连亮)2
1 School of Electronic and Information Engineering, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528400, China;
2 College of Science, North China University of Technology, Beijing 100041, China
Abstract  Spin-polarized current generated by thermal bias across a system composed of a quantum dot (QD) connected to metallic leads is studied in the presence of magnetic and photon fields. The current of a certain spin orientation vanishes when the dot level is aligned to the lead's chemical potential, resulting in a 100% spin-polarized current. The spin-resolved current also changes its sign at the two sides of the zero points. By tuning the system's parameters, spin-up and spin-down currents with equal strength may flow in opposite directions, which induces a pure spin current without the accompany of charge current. With the help of the thermal bias, both the strength and the direction of the spin-polarized current can be manipulated by tuning either the frequency or the intensity of the photon field, which is beyond the reach of the usual electric bias voltage.
Keywords:  quantum dot      spin-polarized current      thermal bias      photon field     
Received:  22 October 2016      Published:  05 March 2017
PACS:  73.21.La (Quantum dots)  
  72.15.Jf (Thermoelectric and thermomagnetic effects)  
  73.50.Lw (Thermoelectric effects)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61274101 and 51362031), the Initial Project for High-Level Talents of UESTC, Zhongshan Insitute, China (Grant No. 415YKQ02), and China Postdoctoral Science Foundation (Grant No. 2014M562301).
Corresponding Authors:  Feng Chi     E-mail:  chifeng@semi.ac.cn

Cite this article: 

Feng Chi(迟锋), Liming Liu(刘黎明), Lianliang Sun(孙连亮) Photon-mediated spin-polarized current in a quantum dot under thermal bias 2017 Chin. Phys. B 26 037304

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