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Perfect Zeeman Anisotropy in Rotationally Symmetric Quantum Dots with Strong Spin-Orbit Interaction

Aspegren, Markus LU ; Chergui, Lila LU ; Marnauza, Mikelis LU orcid ; Debbarma, Rousan LU ; Bengtsson, Jakob LU ; Lehmann, Sebastian LU ; Dick, Kimberly A. LU ; Reimann, Stephanie M. LU and Thelander, Claes LU (2024) In Nano Letters 24(26). p.7927-7933
Abstract

In nanoscale structures with rotational symmetry, such as quantum rings, the orbital motion of electrons combined with a spin-orbit interaction can produce a very strong and anisotropic Zeeman effect. Since symmetry is sensitive to electric fields, ring-like geometries provide an opportunity to manipulate magnetic properties over an exceptionally wide range. In this work, we show that it is possible to form rotationally symmetric confinement potentials inside a semiconductor quantum dot, resulting in electron orbitals with large orbital angular momentum and strong spin−orbit interactions. We find complete suppression of Zeeman spin splitting for magnetic fields applied in the quantum dot plane, similar to the expected behavior of an... (More)

In nanoscale structures with rotational symmetry, such as quantum rings, the orbital motion of electrons combined with a spin-orbit interaction can produce a very strong and anisotropic Zeeman effect. Since symmetry is sensitive to electric fields, ring-like geometries provide an opportunity to manipulate magnetic properties over an exceptionally wide range. In this work, we show that it is possible to form rotationally symmetric confinement potentials inside a semiconductor quantum dot, resulting in electron orbitals with large orbital angular momentum and strong spin−orbit interactions. We find complete suppression of Zeeman spin splitting for magnetic fields applied in the quantum dot plane, similar to the expected behavior of an ideal quantum ring. Spin splitting reappears as orbital interactions are activated with symmetry-breaking electric fields. For two valence electrons, representing a common basis for spin-qubits, we find that modulating the rotational symmetry may offer new prospects for realizing tunable protection and interaction of spin-orbital states.

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author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
quantum dot, quantum ring, spin−orbit interaction, symmetry, Zeeman effect
in
Nano Letters
volume
24
issue
26
pages
7 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • pmid:38885648
  • scopus:85196632168
ISSN
1530-6984
DOI
10.1021/acs.nanolett.4c01247
language
English
LU publication?
yes
id
f78908ad-bfff-4e59-8561-a890982d5607
date added to LUP
2024-08-30 14:53:31
date last changed
2025-05-24 16:56:29
@article{f78908ad-bfff-4e59-8561-a890982d5607,
  abstract     = {{<p>In nanoscale structures with rotational symmetry, such as quantum rings, the orbital motion of electrons combined with a spin-orbit interaction can produce a very strong and anisotropic Zeeman effect. Since symmetry is sensitive to electric fields, ring-like geometries provide an opportunity to manipulate magnetic properties over an exceptionally wide range. In this work, we show that it is possible to form rotationally symmetric confinement potentials inside a semiconductor quantum dot, resulting in electron orbitals with large orbital angular momentum and strong spin−orbit interactions. We find complete suppression of Zeeman spin splitting for magnetic fields applied in the quantum dot plane, similar to the expected behavior of an ideal quantum ring. Spin splitting reappears as orbital interactions are activated with symmetry-breaking electric fields. For two valence electrons, representing a common basis for spin-qubits, we find that modulating the rotational symmetry may offer new prospects for realizing tunable protection and interaction of spin-orbital states.</p>}},
  author       = {{Aspegren, Markus and Chergui, Lila and Marnauza, Mikelis and Debbarma, Rousan and Bengtsson, Jakob and Lehmann, Sebastian and Dick, Kimberly A. and Reimann, Stephanie M. and Thelander, Claes}},
  issn         = {{1530-6984}},
  keywords     = {{quantum dot; quantum ring; spin−orbit interaction; symmetry; Zeeman effect}},
  language     = {{eng}},
  month        = {{07}},
  number       = {{26}},
  pages        = {{7927--7933}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Nano Letters}},
  title        = {{Perfect Zeeman Anisotropy in Rotationally Symmetric Quantum Dots with Strong Spin-Orbit Interaction}},
  url          = {{http://dx.doi.org/10.1021/acs.nanolett.4c01247}},
  doi          = {{10.1021/acs.nanolett.4c01247}},
  volume       = {{24}},
  year         = {{2024}},
}