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Spin effects in thermoelectric transport through quantum dot systems

Łukasz Karwacki

Abstract

Spin Seebeck effect is currently believed to be one of the most effective ways to obtain spin current. In this thesis I consider both charge and spin Seebeck effects in quantum dot systems. Particularly, I considered the influence of such effects as Coulomb blockade and quantum interference effects on thermoelectric transport. The thesis has been divided into three parts, which pertain to different, so-called, transport regimes: Coulomb, strongly correlated (Kondo) and weakly coupled. In Coulomb regime I have analyzed transport through a single quantum dot and a double quantum dot system. In both cases dots were coupled to ferromagnetic leads. Moreover, Rashba spin-orbit coupling has been considered as one of the ways to control spin current in nanostructures. Second part pertains to analysis of the above-introduced models in the strongly correlated, or Kondo, regime. I have shown that due to quantum interference effects an enhancement of thermoelectric figure of merit is possible. Last part contains analysis of the transport through quantum dot coupled to two metallic leads and to two magnetic insulators, which are sources of spin waves. In this system temperature difference between electrodes leads to conversion of spin currents of magnon origin to spin current of electronic origin, and vice versa.
Record ID
UAM1c57c855d5b14396b75da93b909f6f42
Diploma type
Doctor of Philosophy
Author
Łukasz Karwacki (tfccs) Łukasz Karwacki,,
Title in Polish
Spinowe efekty w transporcie termoelektrycznym przez układy kropek kwantowych
Title in English
Spin effects in thermoelectric transport through quantum dot systems
Language
pl Polish
Certifying Unit
Faculty of Physics (SNŚ/WyF/FoP)
Discipline
physics / (physical sciences domain) / (physical sciences)
Scientific discipline (2.0)
6.6 physical sciences
Defense Date
06-07-2017
Title date
06-07-2017
Supervisor
URL
http://hdl.handle.net/10593/18210 opening in a new tab
Keywords in English
quantum dots spinowe, spin thermoelectric effects, spintronics, interference effects, Kondo effect
Abstract in English
Spin Seebeck effect is currently believed to be one of the most effective ways to obtain spin current. In this thesis I consider both charge and spin Seebeck effects in quantum dot systems. Particularly, I considered the influence of such effects as Coulomb blockade and quantum interference effects on thermoelectric transport. The thesis has been divided into three parts, which pertain to different, so-called, transport regimes: Coulomb, strongly correlated (Kondo) and weakly coupled. In Coulomb regime I have analyzed transport through a single quantum dot and a double quantum dot system. In both cases dots were coupled to ferromagnetic leads. Moreover, Rashba spin-orbit coupling has been considered as one of the ways to control spin current in nanostructures. Second part pertains to analysis of the above-introduced models in the strongly correlated, or Kondo, regime. I have shown that due to quantum interference effects an enhancement of thermoelectric figure of merit is possible. Last part contains analysis of the transport through quantum dot coupled to two metallic leads and to two magnetic insulators, which are sources of spin waves. In this system temperature difference between electrodes leads to conversion of spin currents of magnon origin to spin current of electronic origin, and vice versa.
Thesis file

Uniform Resource Identifier
https://researchportal.amu.edu.pl/info/phd/UAM1c57c855d5b14396b75da93b909f6f42/

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