Symmetry-controlled singlet-triplet transition in a double-barrier quantum ring
(2021) In Physical Review B 104(8).- Abstract
We engineer a system of two strongly confined quantum dots to gain reproducible electrostatic control of the even-electron spin at zero magnetic field. Coupling the dots in a tight ring-shaped potential with two tunnel barriers, we demonstrate that an electric field can switch the electron ground state between a singlet and a triplet configuration. Comparing our experimental cotunneling spectroscopy data to a full many-body treatment of interacting electrons in a double-barrier quantum ring, we find excellent agreement in the evolution of many-body states with electric and magnetic fields. The calculations show that the singlet-triplet energy crossover, not found in conventionally coupled quantum dots, is made possible by the... (More)
We engineer a system of two strongly confined quantum dots to gain reproducible electrostatic control of the even-electron spin at zero magnetic field. Coupling the dots in a tight ring-shaped potential with two tunnel barriers, we demonstrate that an electric field can switch the electron ground state between a singlet and a triplet configuration. Comparing our experimental cotunneling spectroscopy data to a full many-body treatment of interacting electrons in a double-barrier quantum ring, we find excellent agreement in the evolution of many-body states with electric and magnetic fields. The calculations show that the singlet-triplet energy crossover, not found in conventionally coupled quantum dots, is made possible by the ring-shaped geometry of the confining potential.
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- author
- Potts, Heidi LU ; Josefi, Josef LU ; Chen, I. Ju LU ; Lehmann, Sebastian LU ; Dick, Kimberly A. LU ; Leijnse, Martin LU ; Reimann, Stephanie M. LU ; Bengtsson, Jakob LU and Thelander, Claes LU
- organization
- publishing date
- 2021-08-15
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B
- volume
- 104
- issue
- 8
- article number
- L081409
- publisher
- American Physical Society
- external identifiers
-
- scopus:85114014271
- ISSN
- 2469-9950
- DOI
- 10.1103/PhysRevB.104.L081409
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2021 authors. Published by the American Physical Society.
- id
- 70ffe5fd-bf23-4617-9f2c-9f12723fa9c9
- date added to LUP
- 2022-02-11 14:44:54
- date last changed
- 2023-10-28 21:56:00
@article{70ffe5fd-bf23-4617-9f2c-9f12723fa9c9,
abstract = {{<p>We engineer a system of two strongly confined quantum dots to gain reproducible electrostatic control of the even-electron spin at zero magnetic field. Coupling the dots in a tight ring-shaped potential with two tunnel barriers, we demonstrate that an electric field can switch the electron ground state between a singlet and a triplet configuration. Comparing our experimental cotunneling spectroscopy data to a full many-body treatment of interacting electrons in a double-barrier quantum ring, we find excellent agreement in the evolution of many-body states with electric and magnetic fields. The calculations show that the singlet-triplet energy crossover, not found in conventionally coupled quantum dots, is made possible by the ring-shaped geometry of the confining potential.</p>}},
author = {{Potts, Heidi and Josefi, Josef and Chen, I. Ju and Lehmann, Sebastian and Dick, Kimberly A. and Leijnse, Martin and Reimann, Stephanie M. and Bengtsson, Jakob and Thelander, Claes}},
issn = {{2469-9950}},
language = {{eng}},
month = {{08}},
number = {{8}},
publisher = {{American Physical Society}},
series = {{Physical Review B}},
title = {{Symmetry-controlled singlet-triplet transition in a double-barrier quantum ring}},
url = {{http://dx.doi.org/10.1103/PhysRevB.104.L081409}},
doi = {{10.1103/PhysRevB.104.L081409}},
volume = {{104}},
year = {{2021}},
}