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Conductance Quantization in Schottky-gated Si/SiGe Quantum Point Contacts

G. Scappucci, L. Di Gaspare, E. Giovine, A. Notargiacomo, R. Leoni, F. Evangelisti

cond-mat.mes-hallarXiv:cond-mat/0609111

Abstract

We report on the fabrication and electronic transport characterisation of Schottky-gated strongly confined Si/SiGe quantum point contacts (QPC). At zero magnetic field and T=450mK the QPC conductance as a function of gate voltage shows a quantization in units of e2/h, indicative of transport through 1D modes which appear to lack both spin and valley degeneracy.

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