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

Abstract

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.

4 pages, 1 figure

References in corpus (2)

• Magnetic impurity formation in quantum point contacts
• Assisted hopping and interaction effects in impurity models

Cited by in corpus (7)

• Experimental Test of the High-Frequency Quantum Shot Noise Theory in a Quantum Point Contact
• Effects of short-range interactions on transport through quantum point contacts: A numerical approach
• 0.7 Structure and Zero Bias Anomaly in Ballistic Hole Quantum Wires
• Conductance Anomaly and Fano Factor Reduction in Quantum Point Contacts
• The theory of the "0.7 anomaly" in quantum point contacts
• Dephasing in a quantum dot coupled to a quantum point contact
• Nuclear magnetic resonance probes for the Kondo scenario for the 0.7 feature in semiconductor quantum point contact devices