Interaction effects in the transport of particles in nanowire quantum dots

Liney Halla Kristinsdottir

Research output: ThesisDoctoral Thesis (compilation)

150 Downloads (Pure)

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 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.
Original languageEnglish
QualificationDoctor
Awarding Institution
  • Mathematical Physics
Supervisors/Advisors
  • Reimann-Wacker, Stephanie M, Supervisor
Award date2015 May 12
ISBN (Print)978-91-7623-279-8
ISBN (electronic) 978-91-7623-280-4
Publication statusPublished - 2015

Bibliographical note

Defence details

Date: 2015-05-12
Time: 10:15
Place: Lundamarksalen at Lund Observatory, Sölvegatan 27, Lund

External reviewer(s)

Name: Schmelcher, Peter
Title: [unknown]
Affiliation: Institute for Laser Physics, University of Hamburg, Germany

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The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Mathematical Physics (Faculty of Technology) (011040002)

Subject classification (UKÄ)

  • Physical Sciences

Free keywords

  • Wigner localization
  • atom transport
  • electron transport
  • ultracold dipolar gases
  • Quantum dots
  • semiconductor nanowires
  • current blockade
  • thermopower
  • Fysicumarkivet A:2015:Kristinsdottir

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