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Title: Spin power and efficiency in an Aharnov-Bohm ring with an embedded magnetic impurity quantum dot

Spin thermoelectric effects in an Aharnov-Bohm ring with a magnetic impurity quantum dot (QD) are theoretically investigated by using the nonequilibrium Green's function method. It is found that due to the exchange coupling between the impurity and the electrons in QD, spin output power, and efficiency can be significant and be further modulated by the gate voltage. The spin thermoelectric effect can be modulated effectively by adjusting the Rashba spin-orbit interaction (RSOI) and the magnetic flux. The spin power and efficiency show zigzag oscillations, and thus spin thermoelectric effect can be switched by adjusting the magnetic flux phase factor and RSOI ones. In addition, the spin efficiency can be significantly enhanced by the coexistence of the RSOI and the magnetic flux, and the maximal value of normalized spin efficiency η{sub max}/η{sub C} = 0.35 is obtained. Our results show that such a QD ring device may be used as a manipulative spin thermoelectric generator.
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084 (China)
  2. (China)
  3. College of New Energy, Bohai University, Jinzhou 121013 (China)
  4. School of Physical Science and Technology, Inner Mongolia University, Huhehaote 010023 (China)
Publication Date:
OSTI Identifier:
22399057
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; AHARONOV-BOHM EFFECT; EFFICIENCY; ELECTRIC POTENTIAL; ELECTRONS; L-S COUPLING; MAGNETIC FLUX; MAGNETISM; OSCILLATIONS; QUANTUM DOTS; SPIN; THERMOELECTRIC GENERATORS NESDPS Office of Nuclear Energy Space and Defense Power Systems