We fabricated strongly confined Schottky-gated quantum point contacts by etching Si/SiGe heterostructures and observed intriguing conductance quantization in units of approximately 1e(2)/h. Nonlinear conductance measurements were performed depleting the quantum point contacts at fixed mode-energy separation. We report evidence of the formation of a half 1e(2)/h plateau, supporting the speculation that adiabatic transmission occurs through one-dimensional modes with complete removal of valley and spin degeneracies.
Conductance quantization in etched Si/SiGe quantum point contacts
E Giovine;A Notargiacomo;R Leoni;F Evangelisti
2006
Abstract
We fabricated strongly confined Schottky-gated quantum point contacts by etching Si/SiGe heterostructures and observed intriguing conductance quantization in units of approximately 1e(2)/h. Nonlinear conductance measurements were performed depleting the quantum point contacts at fixed mode-energy separation. We report evidence of the formation of a half 1e(2)/h plateau, supporting the speculation that adiabatic transmission occurs through one-dimensional modes with complete removal of valley and spin degeneracies.File in questo prodotto:
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