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Correlation effects in transport through quantum dot systems

Kacper Wrześniewski

Abstract

The PhD thesis concerns theoretical studies of charge and spin transport through the systems consisting of coupled quantum dots attached to external leads. The considered structures exhibit many interesting physical properties, not observed in bulk materials, resulting from various quantum effects and correlations, as well as different geometrical arrangements. The focus of this dissertation is on various correlation effects and their influence on transport through quantum dot systems. In particular, the quantum interference effects in triangular quantum dots responsible for the appearance of dark states are extensively studied. Moreover, an important class of considered systems are quantum dot based Cooper pair splitters. The proximity of superconductor induces pairing correlations in quantum dots and gives rise to the formation of Andreev bound states for energies smaller than the superconducting energy gap. The Andreev transport is analyzed with an emphasis on the current cross-correlations in order to optimize the parameters for obtaining high Cooper pair splitting efficiency.
Record ID
UAM7dfb9a99906a4135b6b30107ea17461f
Diploma type
Doctor of Philosophy
Author
Kacper Wrześniewski (SNŚ/WyF/FoP) Kacper Wrześniewski,,
Title in Polish
Efekty korelacji w transporcie przez układy kropek kwantowych
Title in English
Correlation effects in transport through quantum dot systems
Language
en English
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
05-11-2018
Title date
05-11-2018
Supervisor
URL
http://hdl.handle.net/10593/24098 opening in a new tab
Keywords in English
quantum dots, quantum transport, dark states, Cooper pair splitters
Abstract in English
The PhD thesis concerns theoretical studies of charge and spin transport through the systems consisting of coupled quantum dots attached to external leads. The considered structures exhibit many interesting physical properties, not observed in bulk materials, resulting from various quantum effects and correlations, as well as different geometrical arrangements. The focus of this dissertation is on various correlation effects and their influence on transport through quantum dot systems. In particular, the quantum interference effects in triangular quantum dots responsible for the appearance of dark states are extensively studied. Moreover, an important class of considered systems are quantum dot based Cooper pair splitters. The proximity of superconductor induces pairing correlations in quantum dots and gives rise to the formation of Andreev bound states for energies smaller than the superconducting energy gap. The Andreev transport is analyzed with an emphasis on the current cross-correlations in order to optimize the parameters for obtaining high Cooper pair splitting efficiency.
Thesis file

Uniform Resource Identifier
https://researchportal.amu.edu.pl/info/phd/UAM7dfb9a99906a4135b6b30107ea17461f/

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