Tuning the Two-Electron Hybridization and Spin States in Parallel-Coupled InAs Quantum Dots
(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
- Nilsson, Malin LU ; Boström, Florinda Viñas LU ; Lehmann, Sebastian LU ; Dick, Kimberly A. LU ; Leijnse, Martin LU and Thelander, Claes LU
- organization
- publishing date
- 2018
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review Letters
- volume
- 121
- issue
- 15
- article number
- 156802
- publisher
- American Physical Society
- external identifiers
-
- pmid:30362807
- 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
- 2024-08-06 02:13:00
@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>}}, 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}}, doi = {{10.1103/PhysRevLett.121.156802}}, volume = {{121}}, year = {{2018}}, }