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Title:Spontaneous spin-polarization in quantum point contact
Author(s):Wang, Ningdong
Contributor(s):Leburton, Jean-Pierre
Subject(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.
Issue Date:2020-05
Genre:Other
Type:Text
Language:English
URI:http://hdl.handle.net/2142/107262
Date Available in IDEALS:2020-06-12


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