Suppression of Shot Noise in Quantum Point Contacts in the "0.7" Regime

Details Suppression of Shot Noise in Quantum Point Contacts in the "0.7" Regime Suppression of Shot Noise in Quantum Point Contacts in the "0.7" Regime

2006-05-04

arxiv.org/abs/cond-mat/0605114v1

Phys. Rev. Lett. 97, 186801 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.97.186801

Experimental investigations of current shot noise in quantum point contacts show a reduction of the noise near the 0.7 anomaly. It is demonstrated that such a reduction naturally arises in a model proposed recently to explain the characteristics of the 0.7 anomaly in quantum point contacts in terms of a quasi-bound state, due to the emergence of two conducting channels. We calculate the shot noise as a function of temperature, applied voltage and magnetic field, and demonstrate an excellent agreement with experiments. It is predicted that with decreasing temperature, voltage and magnetic field, the dip in the shot noise is suppressed due to the Kondo effect.

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