University of Illinois Urbana-Champaign

Spontaneous spin-polarization in quantum point contact

Wang, Ningdong

Content Files
SP20-ECE499-Thesis-Wang, Ningdong.pdf

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https://hdl.handle.net/2142/107262

Description

Title
Spontaneous spin-polarization in quantum point contact
Author(s)
Wang, Ningdong
Contributor(s)
Leburton, Jean-Pierre
Issue Date
2020-05
Keyword(s)
  • quantum point contact
  • spin
  • spin polarization
Date of Ingest
2020-06-12T14:19:08Z
Abstract
One-dimensional nanostructures such as quantum wires (QWRs) and quantum point contacts (QPCs) have drawn interests for their electronic transport properties. QPCs are commonly made of a heterojunction of GaAs/AlGaAs with a metallic gate on top, which restricts electron movement in 1D through a 2D confinement potential. In this study, we implemented an unrestricted Hartree-Fock model to study electronic transport in quasi-1D systems with three-dimensional Coulomb and electron-electron interaction, neglecting spin-orbit coupling. The model predicts the emergence of spontaneous spin-polarized excited states for electron concentrations above a confinement-dependent threshold. We demonstrated the existence of spontaneous spin polarization in QPCs and verified previous results.
Type of Resource
text
Genre of Resource
other
Language
en
Permalink
http://hdl.handle.net/2142/107262

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