Alfredo X. Sánchez, Jean-Pierre Leburton
We investigate ballistic transport through a quantum point contact (QPC) along a GaAs/AlGaAs heterojunction with a transfer matrix technique, as a function of temperature and the shape of the potential barrier in the QPC. Our analysis is based on a three-dimensional (3D) quantum-mechanical variational model within the Hartree-Fock approximation that takes into account the vertical depletion potential from ionized acceptors in GaAs and the gate-induced transverse confinement potential that reduce to an effective slowly-varying one-dimensional (1D) potential along the narrow constriction. The calculated transmission at T=\unit[0]{K} exhibits a shoulder ranging from 0.3 to 0.6 depending on the length of the QPC and the profile of the barrier potential. The effect is a consequence of the compressibility peak in the 1D electron gas and is enhanced for anti-ferromagnetic interaction among electrons in the QPC, but is smeared out once temperature is increased by a few tenths of a kelvin.
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http://arxiv.org/abs/1306.1879
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