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Non-Kondo zero-bias anomaly in quantum wires

Chen, TM; Graham, AC; Pepper, M; Farrer, I; Ritchie, DA; (2009) Non-Kondo zero-bias anomaly in quantum wires. PHYS REV B , 79 (15) , Article 153303. 10.1103/PhysRevB.79.153303.

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Abstract

It has been suggested that a zero-bias conductance peak in quantum wires signifies the presence of Kondo spin-correlations, which might also relate to an intriguing one-dimensional (1D) spin effect known as the 0.7 structure. These zero-bias anomalies (ZBA) are strongly temperature dependent, and have been observed to split into two peaks in magnetic field, both signatures of Kondo correlations in quantum dots. We present data in which ZBAs in general do not split as magnetic field is increased up to 10 T. A few of our ZBAs split in magnetic field but by significantly less than the Kondo splitting value, and evolve back to a single peak upon moving the 1D constriction laterally. The ZBA therefore does not appear to have a Kondo origin, and instead we propose a simple phenomenological model to reproduce the ZBA which is in agreement mostly with observed characteristics.

Type:Article
Title:Non-Kondo zero-bias anomaly in quantum wires
DOI:10.1103/PhysRevB.79.153303
Keywords:Kondo effect, quantum dots, quantum wires, SINGLE-ELECTRON TRANSISTOR, POINT CONTACTS, SPIN POLARIZATION, MAGNETIC-FIELD, CONDUCTANCE, CONSTRICTION, ALLOYS
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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