Non-Kondo zero-bias anomaly in quantum wires

T. M. Chen, A. C. Graham, M. Pepper, I. Farrer, D. A. Ritchie

研究成果: Article同行評審

24 引文 斯高帕斯(Scopus)

摘要

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 there fore 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.

原文English
文章編號e153303
期刊Physical Review B - Condensed Matter and Materials Physics
79
發行號15
DOIs
出版狀態Published - 2009

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學

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