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Portrait of Martin Leijnse; Photo: Kennet Ruona

Martin Leijnse

Professor, Member of NanoLund Management Group

Portrait of Martin Leijnse; Photo: Kennet Ruona

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

Author

  • Heidi Potts
  • Martin Leijnse
  • Adam Burke
  • Malin Nilsson
  • Sebastian Lehmann
  • Kimberly A. Dick
  • Claes Thelander

Summary, in English

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.

Department/s

  • Solid State Physics
  • NanoLund: Center for Nanoscience
  • Centre for Analysis and Synthesis

Publishing year

2020

Language

English

Publication/Series

Physical Review B

Volume

101

Issue

11

Document type

Journal article

Publisher

American Physical Society

Topic

  • Condensed Matter Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 2469-9950