Spontaneous spin-polarization in quantum point contact
Wang, Ningdong
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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
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.
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