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Tunable zero-field Kondo splitting in a quantum dot

Larsson, Marcus LU ; Lim, J. S.; Lopez, R. and Xu, Hongqi LU (2013) In Physical Review B (Condensed Matter and Materials Physics) 88(8).
Abstract
We present detailed low-temperature transport measurements of a single quantum dot formed in an InGaAs/InP heterostructure with a strong tunnel coupling to the source and drain leads. The conventional spin-1/2 Kondo effect is observed for the quantum dot in the N = 9 charge state. By changing the voltages applied to the quantum dot barrier gates, we find a zero-field splitting of the Kondo resonance and a zero-bias differential conductance, which shows a nonmonotonic in-plane magnetic field and temperature dependence. Using a two-site Hubbard model, we show that the main observed features can be explained in terms of Kondo correlation effects resulting from the exchange interaction between two localized spins.
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
88
issue
8
publisher
American Physical Society
external identifiers
  • wos:000322813800007
  • scopus:84884506787
ISSN
1098-0121
DOI
10.1103/PhysRevB.88.085407
language
English
LU publication?
yes
id
f4843ce5-7166-4fc1-b85d-58051ab8859a (old id 4030656)
date added to LUP
2013-10-07 17:14:49
date last changed
2019-02-20 05:44:37
@article{f4843ce5-7166-4fc1-b85d-58051ab8859a,
  abstract     = {We present detailed low-temperature transport measurements of a single quantum dot formed in an InGaAs/InP heterostructure with a strong tunnel coupling to the source and drain leads. The conventional spin-1/2 Kondo effect is observed for the quantum dot in the N = 9 charge state. By changing the voltages applied to the quantum dot barrier gates, we find a zero-field splitting of the Kondo resonance and a zero-bias differential conductance, which shows a nonmonotonic in-plane magnetic field and temperature dependence. Using a two-site Hubbard model, we show that the main observed features can be explained in terms of Kondo correlation effects resulting from the exchange interaction between two localized spins.},
  articleno    = {085407},
  author       = {Larsson, Marcus and Lim, J. S. and Lopez, R. and Xu, Hongqi},
  issn         = {1098-0121},
  language     = {eng},
  number       = {8},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Tunable zero-field Kondo splitting in a quantum dot},
  url          = {http://dx.doi.org/10.1103/PhysRevB.88.085407},
  volume       = {88},
  year         = {2013},
}