Conductance quantization in etched Si/SiGe quantum point contacts

Details Conductance quantization in etched Si/SiGe quantum point contacts Conductance quantization in etched Si/SiGe quantum point contacts

2005-12-16

arxiv.org/abs/cond-mat/0512412v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to appear in Physical Review B

Scientific paper

10.1103/PhysRevB.74.035321

We fabricated strongly confined Schottky-gated quantum point contacts by etching Si/SiGe heterostructures and observed intriguing conductance quantization in units of approximately 1e2/h. Non-linear conductance measurements were performed depleting the quantum point contacts at fixed mode-energy separation. We report evidences of the formation of a half 1e2/h plateau, supporting the speculation that adiabatic transmission occurs through 1D modes with complete removal of valley and spin degeneracies.

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