Journal
APPLIED PHYSICS LETTERS
Volume 101, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4764557
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Funding
- National Natural Science Foundation of China (NSFC) [61274101, 11147162]
- NSFC [11174168]
- SRFDP [20100002110079]
- National Basic Research program of China [2011CB606405]
- Jiangsu Laboratory of Advanced Functional Materials [12KFJJ001]
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We propose a pure-spin-current generator based on a single level quantum dot (QD) device subjected to time-dependent magnetic fields. Under low temperature and high magnetic fields, the spin-dependent Seebeck coefficient in the transition regime is rapidly enhanced by several orders of magnitude larger than that in the steady regime. This fact is attributed to a delay effect of the electron transmission probability with respect to the split of the QD energy level. When a temperature gradient is applied across the device, the pure spin current emerges. The findings here suggest a feasible way of enhancing thermospin effects and generating the pure spin current by time-dependent external fields. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4764557]
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