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Optimal single quantum dot heat-to-pure-spin-current converters

DSpace at IIT Bombay

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Title Optimal single quantum dot heat-to-pure-spin-current converters
 
Creator BUDDHIRAJU, S
MURALIDHARAN, B
 
Subject ROOM-TEMPERATURE
DRIVEN
MAGNETIZATION
OSCILLATIONS
CONDUCTANCE
 
Description We delve into the conditions under which a quantum dot thermoelectric setup may be tuned to realize an optimal heat-to-pure-spin-current converter It is well known that a heat-to-pure-spin-current converter may be realized using a non-interacting quantum dot with a spin-split energy spectrum under particle hole symmetry conditions. However, with the inclusion of Coulomb interaction U, ubiquitous in typical quantum dot systems, the relevant transport physics is expected to be altered. In this work, we provide a detailed picture of thermoelectric pure spin currents at various Coulomb interaction parameters U and describe the conditions necessary for an exact cancelation of charge transport between energy levels c and their Coulomb-charged partner levels epsilon + U, so as to yield the largest terminal pure spin currents. A non-trivial aspect pointed out here is that at sufficiently large values of U (>= U-0), pure spin currents tend to optimize at points other than where the particle-hole symmetry occurs. It is also ascertained that a global maximum of pure spin current is generated at a typical value of the interaction parameter U. These optimum conditions may be easily realized using a typical gated quantum dot thermoelectric transport setup. (C) 2015 Elsevier B.V. All rights reserved
 
Publisher ELSEVIER SCIENCE BV
 
Date 2016-01-15T04:55:05Z
2016-01-15T04:55:05Z
2015
 
Type Article
 
Identifier PHYSICA B-CONDENSED MATTER, 478,153-160
0921-4526
1873-2135
http://dx.doi.org/10.1016/j.physb.2015.09.012
http://dspace.library.iitb.ac.in/jspui/handle/100/17810
 
Language en