Tunable zero-field Kondo splitting in a quantum dot
(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:
https://lup.lub.lu.se/record/4030656
- author
- Larsson, Marcus LU ; Lim, J. S. ; Lopez, R. and Xu, Hongqi LU
- organization
- publishing date
- 2013
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B (Condensed Matter and Materials Physics)
- volume
- 88
- issue
- 8
- article number
- 085407
- 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
- 2016-04-01 13:37:12
- date last changed
- 2023-09-03 02:26:09
@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.}}, 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}}, doi = {{10.1103/PhysRevB.88.085407}}, volume = {{88}}, year = {{2013}}, }