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Title: Heat generation by electronic current in a quantum dot spin-valve

Electric-current-induced heat generation in an interacting single-level quantum dot connected to ferromagnetic leads with noncollinear magnetizations is theoretically investigated. We find that when the two leads' spin polarization rates are identical and much smaller than unit, the magnitude of the heat generation is almost monotonously enhanced as the angle between the leads' magnetic moments is varied from zero to π, while the magnitude of the electric current is continuously suppressed. Moreover, the properties of the heat generation depend on the lead's spin polarization rate in different ways when the angle is varied. If at least one of the leads' spin polarization rate approaches to unit, the spin-valve effect of the heat generation is identical to that of the electric current. Now the previously found negative differential of the heat generation disappears when the angle approaches to π. As compared to the current, the heat generation is more sensitive to the system's asymmetry when one of the electrodes is half-metallic in noncollinear configurations.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. School of Physical Science and Technology, Inner Mongolia University, Huhehaote 010023 (China)
  2. (China)
  3. College of Science, North China University of Technology, Beijing 100041 (China)
  4. College of Engineering, Bohai University, Jinzhou 121013 (China)
Publication Date:
OSTI Identifier:
22308182
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ASYMMETRY; ELECTRIC CURRENTS; MAGNETIC MOMENTS; MAGNETIZATION; QUANTUM DOTS; SPIN ORIENTATION