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Effects of Parity and Symmetry on the Aharonov-Bohm Phase of a Quantum Ring

Debbarma, Rousan LU ; Potts, Heidi LU ; Stenberg, Calle Janlén LU ; Tsintzis, Athanasios LU ; Lehmann, Sebastian LU ; Dick, Kimberly LU ; Leijnse, Martin LU and Thelander, Claes LU (2021) In Nano Letters
Abstract

We experimentally investigate the properties of one-dimensional quantum rings that form near the surface of nanowire quantum dots. In agreement with theoretical predictions, we observe the appearance of forbidden gaps in the evolution of states in a magnetic field as the symmetry of a quantum ring is reduced. For a twofold symmetry, our experiments confirm that orbital states are grouped pairwise. Here, a π-phase shift can be introduced in the Aharonov-Bohm relation by controlling the relative orbital parity using an electric field. Studying rings with higher symmetry, we note exceptionally large orbital contributions to the effective g-factor (up to 300), which are many times higher than those previously reported. These findings show... (More)

We experimentally investigate the properties of one-dimensional quantum rings that form near the surface of nanowire quantum dots. In agreement with theoretical predictions, we observe the appearance of forbidden gaps in the evolution of states in a magnetic field as the symmetry of a quantum ring is reduced. For a twofold symmetry, our experiments confirm that orbital states are grouped pairwise. Here, a π-phase shift can be introduced in the Aharonov-Bohm relation by controlling the relative orbital parity using an electric field. Studying rings with higher symmetry, we note exceptionally large orbital contributions to the effective g-factor (up to 300), which are many times higher than those previously reported. These findings show that the properties of a phase-coherent system can be significantly altered by the nanostructure symmetry and its interplay with wave function parity.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Aharonov-Bohm effect, parity, quantum dot, quantum ring, symmetry
in
Nano Letters
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85121914933
  • pmid:34910870
ISSN
1530-6984
DOI
10.1021/acs.nanolett.1c03882
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2021 The Authors. Published by American Chemical Society.
id
653408a1-6353-402e-ab4d-e9014a566e38
date added to LUP
2022-01-30 13:16:09
date last changed
2024-06-16 00:48:48
@article{653408a1-6353-402e-ab4d-e9014a566e38,
  abstract     = {{<p>We experimentally investigate the properties of one-dimensional quantum rings that form near the surface of nanowire quantum dots. In agreement with theoretical predictions, we observe the appearance of forbidden gaps in the evolution of states in a magnetic field as the symmetry of a quantum ring is reduced. For a twofold symmetry, our experiments confirm that orbital states are grouped pairwise. Here, a π-phase shift can be introduced in the Aharonov-Bohm relation by controlling the relative orbital parity using an electric field. Studying rings with higher symmetry, we note exceptionally large orbital contributions to the effective g-factor (up to 300), which are many times higher than those previously reported. These findings show that the properties of a phase-coherent system can be significantly altered by the nanostructure symmetry and its interplay with wave function parity. </p>}},
  author       = {{Debbarma, Rousan and Potts, Heidi and Stenberg, Calle Janlén and Tsintzis, Athanasios and Lehmann, Sebastian and Dick, Kimberly and Leijnse, Martin and Thelander, Claes}},
  issn         = {{1530-6984}},
  keywords     = {{Aharonov-Bohm effect; parity; quantum dot; quantum ring; symmetry}},
  language     = {{eng}},
  month        = {{12}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Nano Letters}},
  title        = {{Effects of Parity and Symmetry on the Aharonov-Bohm Phase of a Quantum Ring}},
  url          = {{http://dx.doi.org/10.1021/acs.nanolett.1c03882}},
  doi          = {{10.1021/acs.nanolett.1c03882}},
  year         = {{2021}},
}