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Interaction effects in the transport of particles in nanowire quantum dots

Kristinsdottir, Liney Halla LU (2015)
Abstract
Interactions between physical bodies constantly affect their properties.

This thesis presents a theoretical study on the effects of interaction in few-body nanowire quantum dots. The focus is to a large extent on a phenomenon called Wigner localization, and how this, as well as other interaction effects, can be identified in an experiment by transport spectroscopy and by thermopower measurements. The physical systems considered are electrons in semiconductor nanowires and an ultracold gas of dipolar particles in magneto-optical traps. The full many-body description of the nanowire quantum dot is obtained by exact diagonalization (also known as the configuration interaction method) while the transport simulations are based on a... (More)
Interactions between physical bodies constantly affect their properties.

This thesis presents a theoretical study on the effects of interaction in few-body nanowire quantum dots. The focus is to a large extent on a phenomenon called Wigner localization, and how this, as well as other interaction effects, can be identified in an experiment by transport spectroscopy and by thermopower measurements. The physical systems considered are electrons in semiconductor nanowires and an ultracold gas of dipolar particles in magneto-optical traps. The full many-body description of the nanowire quantum dot is obtained by exact diagonalization (also known as the configuration interaction method) while the transport simulations are based on a Pauli master equation approach. The thesis is based on three papers: In Paper I we examine Wigner localization in an InSb nanowire quantum dot and identify the onset of Wigner localization in an experiment. In Paper II we study how different interaction regimes can be accessed in an ultracold dipolar gas by tuning the dipole-dipole interaction externally, providing Wigner localization for strong repulsion and total current blockade for attraction. The effect of excited states on the thermopower lineshape is investigated in Paper III, asserting the possibility to detect the onset of Wigner localization by thermopower measurements. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Schmelcher, Peter, Institute for Laser Physics, University of Hamburg, Germany
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Wigner localization, atom transport, electron transport, ultracold dipolar gases, Quantum dots, semiconductor nanowires, current blockade, thermopower, Fysicumarkivet A:2015:Kristinsdottir
pages
108 pages
defense location
Lundamarksalen at Lund Observatory, Sölvegatan 27, Lund
defense date
2015-05-12 10:15
ISBN
978-91-7623-279-8 (print)
978-91-7623-280-4 (pdf )
language
English
LU publication?
yes
id
468a212c-d8a0-4e33-a3c6-9bca7ecca05c (old id 5275254)
date added to LUP
2015-04-15 11:05:04
date last changed
2016-09-19 08:45:17
@misc{468a212c-d8a0-4e33-a3c6-9bca7ecca05c,
  abstract     = {Interactions between physical bodies constantly affect their properties.<br/><br>
 This thesis presents a theoretical study on the effects of interaction in few-body nanowire quantum dots. The focus is to a large extent on a phenomenon called Wigner localization, and how this, as well as other interaction effects, can be identified in an experiment by transport spectroscopy and by thermopower measurements. The physical systems considered are electrons in semiconductor nanowires and an ultracold gas of dipolar particles in magneto-optical traps. The full many-body description of the nanowire quantum dot is obtained by exact diagonalization (also known as the configuration interaction method) while the transport simulations are based on a Pauli master equation approach. The thesis is based on three papers: In Paper I we examine Wigner localization in an InSb nanowire quantum dot and identify the onset of Wigner localization in an experiment. In Paper II we study how different interaction regimes can be accessed in an ultracold dipolar gas by tuning the dipole-dipole interaction externally, providing Wigner localization for strong repulsion and total current blockade for attraction. The effect of excited states on the thermopower lineshape is investigated in Paper III, asserting the possibility to detect the onset of Wigner localization by thermopower measurements.},
  author       = {Kristinsdottir, Liney Halla},
  isbn         = {978-91-7623-279-8 (print)},
  keyword      = {Wigner localization,atom transport,electron transport,ultracold dipolar gases,Quantum dots,semiconductor nanowires,current blockade,thermopower,Fysicumarkivet A:2015:Kristinsdottir},
  language     = {eng},
  pages        = {108},
  title        = {Interaction effects in the transport of particles in nanowire quantum dots},
  year         = {2015},
}