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Shot noise suppression in InGaAs/InGaAsP quantum channels
release_j5hit7opmfb35avyv6dg2redhm
by
Yoshitaka Nishihara,
Shuji Nakamura,
Kensuke Kobayashi,
Teruo Ono,
Makoto Kohda,
Junsaku Nitta
Released
as a article
.
2012
Abstract
We have measured the shot noise in a quantum point contact (QPC) fabricated
by using InGaAs/InGaAsP heterostructure, whose conductance can be electrically
tuned by the gate voltages. The reduced shot noise is observed when the QPC
conductance equals to N(2e^2/h) (N=4, 5, and 6), which is the direct
experimental evidence of the coherent quantized channel formation in the QPC.
The deviation of the observed Fano factor from the theory is explained by the
electron heating effect generated at the QPC.
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1205.6271v2
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