SPONTANEOUS SPIN-POLARIZATION IN QUANTUM POINT CANTACT

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https://hdl.handle.net/2142/125052

Title: SPONTANEOUS SPIN-POLARIZATION IN QUANTUM POINT CANTACT
Author(s): Wang, Ningdong
Issue Date: 2020-05-01
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 electronelectron 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
Language: eng

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