Interactions and coherences in electron transport through serially coupled quantum dots
Author
Summary, in English
This thesis is considering various aspects of electronic transport through quantum dots, with the focus on two or three dots coupled in series.
In paper I, we study the impact of electron-electron interactions on transport in a system of triple quantum dots with spin. We show that due to electron-electron scattering processes, transport is possible beyond the common single-particle transmission channels. We also check the validity of the Pauli master equation by comparing it with the first-order von Neumann approach.
In paper II, we report the addition of phonon scattering to the recently established numerical package QmeQ for transport in quantum dot systems. Also, we analyze phonon-assisted transport in the absence of applied source-drain voltage.
In paper III, we present a combined experimental and theoretical study of a nanowire double quantum dot system. We investigate the origin and properties of the bias triangle features and predict and observe features directly related to the inter-dot exchange energy.
In paper IV, based on what was presented in paper II, it is shown that by coupling a hot phonon bath to a double quantum dot, phonon assisted transport can be used to drive currents through the double dot and effectively harvest energy from the phonon bath.
In paper I, we study the impact of electron-electron interactions on transport in a system of triple quantum dots with spin. We show that due to electron-electron scattering processes, transport is possible beyond the common single-particle transmission channels. We also check the validity of the Pauli master equation by comparing it with the first-order von Neumann approach.
In paper II, we report the addition of phonon scattering to the recently established numerical package QmeQ for transport in quantum dot systems. Also, we analyze phonon-assisted transport in the absence of applied source-drain voltage.
In paper III, we present a combined experimental and theoretical study of a nanowire double quantum dot system. We investigate the origin and properties of the bias triangle features and predict and observe features directly related to the inter-dot exchange energy.
In paper IV, based on what was presented in paper II, it is shown that by coupling a hot phonon bath to a double quantum dot, phonon assisted transport can be used to drive currents through the double dot and effectively harvest energy from the phonon bath.
Publishing year
2019
Language
English
Full text
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Document type
Dissertation
Publisher
Lund University , Department of physics
Topic
- Physical Sciences
Status
Published
Supervisor
ISBN/ISSN/Other
- ISBN: 978-91-7895-393-6
- ISBN: 978-91-7895-392-9
Defence date
24 January 2020
Defence time
09:00
Defence place
Lecture Hall Rydberg, Fysicum, Professorsgatan 1, Lund
Opponent
- Jonas Fransson (Professor)