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.

arXiv comment4 pages, 1 figure

References in corpus (19)

• Shot Noise in Mesoscopic Conductors
• Possible Spin Polarization in a One-Dimensional Electron Gas
• The Low-Temperature Fate of the 0.7 Structure in a Point Contact: A Kondo-like Correlated State in an Open System
• Measurements with a noninvasive detector and dephasing mechanism
• Interaction Effects in a One-Dimensional Constriction
• Kondo model for the "0.7 anomaly" in transport through a quantum point contact
• Bias and temperature dependence of the 0.7 conductance anomaly in Quantum Point Contacts
• Dephasing and the Orthogonality Catastrophe in Tunneling through a Quantum Dot: the ``Which Path?'' Interferometer
• Magnetic impurity formation in quantum point contacts
• Many-body spin related phenomena in ultra-low-disorder quantum wires
• Dephasing in a quantum dot due to coupling with a quantum point contact
• Local moment formation in quantum point contacts
• Phenomenological model for the 0.7 conductance feature in quantum wires
• Shot-Noise Signatures of 0.7 Structure and Spin in a Quantum Point Contact
• Shot Noise through a Quantum Dot in the Kondo Regime
• Fano factor reduction on the 0.7 structure in a ballistic one-dimensional wire
• On the perturbative expansion of the magnetization in the out-of-equilibrium Kondo model
• Controlled dephasing of a quantum dot in the Kondo regime
• Assisted hopping and interaction effects in impurity models

Cited by in corpus (10)

• What lurks below the last plateau: Experimental studies of the 0.7 x 2e^2/h conductance anomaly in one-dimensional systems
• 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
• On the relation between the 0.7-anomaly and the Kondo effect: Geometric Crossover between a Quantum Point Contact and a Kondo Quantum Dot
• Spin fluctuations in the 0.7-anomaly in quantum point contacts
• 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