TY - JOUR
T1 - Non-Kondo zero-bias anomaly in quantum wires
AU - Chen, T. M.
AU - Graham, A. C.
AU - Pepper, M.
AU - Farrer, I.
AU - Ritchie, D. A.
N1 - Funding Information:
We acknowledge useful discussion with F. Sfigakis, K. Das Gupta, and K.-F. Berggren. This work was supported by EPSRC (U.K.). T.M.C. acknowledges an ORS award and financial support from the Cambridge Overseas Trust. A.C.G. acknowledges support from Emmanuel College, Cambridge.
Publisher Copyright:
© 2009 The American Physical Society.
PY - 2009
Y1 - 2009
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.79.153303
DO - 10.1103/PhysRevB.79.153303
M3 - Article
AN - SCOPUS:80155124492
SN - 1098-0121
VL - 79
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 15
M1 - e153303
ER -