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Selective tuning of spin-orbital Kondo contributions in parallel-coupled quantum dots

Potts, Heidi LU ; Leijnse, Martin LU ; Burke, Adam LU orcid ; Nilsson, Malin LU ; Lehmann, Sebastian LU ; Dick, Kimberly A. LU and Thelander, Claes LU (2020) In Physical Review B 101(11).
Abstract

We use cotunneling spectroscopy to investigate spin, orbital, and spin-orbital Kondo transport in a strongly confined system of InAs double quantum dots that are parallel coupled to source and drain. In the one-electron transport regime, the higher-symmetry spin-orbital Kondo effect manifests at orbital degeneracy and no external magnetic field. We then proceed to show that the individual Kondo contributions can be isolated and studied separately: either by orbital detuning in the case of spin Kondo transport or by spin splitting in the case of orbital Kondo transport. By varying the interdot tunnel coupling, we show that lifting of the spin degeneracy is key to confirming the presence of an orbital degeneracy and to detecting a small... (More)

We use cotunneling spectroscopy to investigate spin, orbital, and spin-orbital Kondo transport in a strongly confined system of InAs double quantum dots that are parallel coupled to source and drain. In the one-electron transport regime, the higher-symmetry spin-orbital Kondo effect manifests at orbital degeneracy and no external magnetic field. We then proceed to show that the individual Kondo contributions can be isolated and studied separately: either by orbital detuning in the case of spin Kondo transport or by spin splitting in the case of orbital Kondo transport. By varying the interdot tunnel coupling, we show that lifting of the spin degeneracy is key to confirming the presence of an orbital degeneracy and to detecting a small orbital hybridization gap. Finally, in the two-electron regime, we show that the presence of a spin-triplet ground state results in spin Kondo transport at zero magnetic field.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
101
issue
11
article number
115429
publisher
American Physical Society
external identifiers
  • scopus:85083225062
ISSN
2469-9950
DOI
10.1103/PhysRevB.101.115429
language
English
LU publication?
yes
id
7277f239-c5c0-401f-b338-2e641e1ba96c
date added to LUP
2020-04-30 12:51:19
date last changed
2022-04-18 22:06:49
@article{7277f239-c5c0-401f-b338-2e641e1ba96c,
  abstract     = {{<p>We use cotunneling spectroscopy to investigate spin, orbital, and spin-orbital Kondo transport in a strongly confined system of InAs double quantum dots that are parallel coupled to source and drain. In the one-electron transport regime, the higher-symmetry spin-orbital Kondo effect manifests at orbital degeneracy and no external magnetic field. We then proceed to show that the individual Kondo contributions can be isolated and studied separately: either by orbital detuning in the case of spin Kondo transport or by spin splitting in the case of orbital Kondo transport. By varying the interdot tunnel coupling, we show that lifting of the spin degeneracy is key to confirming the presence of an orbital degeneracy and to detecting a small orbital hybridization gap. Finally, in the two-electron regime, we show that the presence of a spin-triplet ground state results in spin Kondo transport at zero magnetic field.</p>}},
  author       = {{Potts, Heidi and Leijnse, Martin and Burke, Adam and Nilsson, Malin and Lehmann, Sebastian and Dick, Kimberly A. and Thelander, Claes}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  number       = {{11}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Selective tuning of spin-orbital Kondo contributions in parallel-coupled quantum dots}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.101.115429}},
  doi          = {{10.1103/PhysRevB.101.115429}},
  volume       = {{101}},
  year         = {{2020}},
}