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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

Spectroscopy and level detuning of few-electron spin states in parallel InAs quantum dots

Author

  • Claes Thelander
  • Malin Nilsson
  • Florinda Viñas Boström
  • Adam Burke
  • Sebastian Lehmann
  • Kimberly A. Dick
  • Martin Leijnse

Summary, in English

We use tunneling spectroscopy to study the evolution of few-electron spin states in parallel InAs nanowire double quantum dots (QDs) as a function of level detuning and applied magnetic field. Compared to the much more studied serial configuration, parallel coupling of the QDs to source and drain greatly expands the probing range of excited-state transport. Owing to a strong confinement, we can here isolate transport involving only the very first interacting single QD orbital pair. For the (2,0)-(1,1) charge transition, with relevance for spin-based qubits, we investigate the excited (1,1) triplet, and hybridization of the (2,0) and (1,1) singlets. An applied magnetic field splits the (1,1) triplet, and due to spin-orbit induced mixing with the (2,0) singlet we clearly resolve transport through all triplet states near the avoided singlet-triplet crossings. Transport calculations, based on a simple model with one orbital on each QD, fully replicate the experimental data. Finally, we observe an expected mirrored symmetry between the one- to two-electron and two- to three-electron transitions resulting from the twofold spin degeneracy of the orbitals.

Department/s

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

Publishing year

2018-12-10

Language

English

Publication/Series

Physical Review B

Volume

98

Issue

24

Document type

Journal article

Publisher

American Physical Society

Topic

  • Condensed Matter Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 2469-9950