English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate near-equilibrium ballistic transport through a quantum pointcontact (QPC) along a GaAs/AlGaAs heterojunction with a transfer matrixtechnique, as a function of temperature and the shape of the potential barrierin the QPC. Our analysis is based on a three-dimensional (3D)quantum-mechanical variational model within the Hartree-Fock approximation thattakes into account the vertical depletion potential from ionized acceptors inGaAs and the gate-induced transverse confinement potential that reduce to aneffective slowly-varying one-dimensional (1D) potential along the narrowconstriction. The calculated zero-temperature transmission exhibits a shoulderranging from 0.3 to 0.6 depending on the length of the QPC and the profile ofthe barrier potential. The effect is a consequence of the compressibility peakin the 1D electron gas and is enhanced for anti-ferromagnetic interaction amongelectrons in the QPC, but is smeared out once temperature is increased by a fewtenths of a kelvin.

Temperature Modulation of the Transmission Barrier in Quantum Point Contacts