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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

Tuning the Two-Electron Hybridization and Spin States in Parallel-Coupled InAs Quantum Dots

Author

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

Summary, in English

We study spin transport in the one- and two-electron regimes of parallel-coupled double quantum dots (DQDs). The DQDs are formed in InAs nanowires by a combination of crystal-phase engineering and electrostatic gating, with an interdot tunnel coupling (t) tunable by one order of magnitude. Large single-particle energy separations (up to 10 meV) and |g∗| factors (∼10) enable detailed studies of the B-field-induced transition from a singlet-to-triplet ground state as a function of t. In particular, we investigate how the magnitude of the spin-orbit-induced singlet-triplet anticrossing depends on t. For cases of strong coupling, we find values of 230 μeV for the anticrossing using excited-state spectroscopy. Experimental results are reproduced by calculations based on rate equations and a DQD model including a single orbital in each dot.

Department/s

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

Publishing year

2018

Language

English

Publication/Series

Physical Review Letters

Volume

121

Issue

15

Document type

Journal article

Publisher

American Physical Society

Topic

  • Condensed Matter Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 0031-9007