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

Nilsson, Malin LU ; Boström, Florinda Viñas LU ; Lehmann, Sebastian LU ; Dick, Kimberly A. LU ; Leijnse, Martin LU and Thelander, Claes LU (2018) In Physical Review Letters 121(15).
Abstract

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... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
121
issue
15
publisher
American Physical Society
external identifiers
  • scopus:85054855142
ISSN
0031-9007
DOI
10.1103/PhysRevLett.121.156802
language
English
LU publication?
yes
id
fd14f918-9216-46e7-b509-5b069e59657e
date added to LUP
2018-10-30 12:34:40
date last changed
2019-03-19 04:01:49
@article{fd14f918-9216-46e7-b509-5b069e59657e,
  abstract     = {<p>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.</p>},
  articleno    = {156802},
  author       = {Nilsson, Malin and Boström, Florinda Viñas and Lehmann, Sebastian and Dick, Kimberly A. and Leijnse, Martin and Thelander, Claes},
  issn         = {0031-9007},
  language     = {eng},
  number       = {15},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Tuning the Two-Electron Hybridization and Spin States in Parallel-Coupled InAs Quantum Dots},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.121.156802},
  volume       = {121},
  year         = {2018},
}