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Electrical control of spins and giant g-factors in ring-like coupled quantum dots

Potts, H. LU ; Chen, I.–J. LU ; Tsintzis, A. LU ; Nilsson, M. LU ; Lehmann, S. LU ; Dick, K. A. LU ; Leijnse, M. LU and Thelander, C. LU (2019) In Nature Communications 10(1).
Abstract
Emerging theoretical concepts for quantum technologies have driven a continuous search for structures where a quantum state, such as spin, can be manipulated efficiently. Central to many concepts is the ability to control a system by electric and magnetic fields, relying on strong spin-orbit interaction and a large g-factor. Here, we present a mechanism for spin and orbital manipulation using small electric and magnetic fields. By hybridizing specific quantum dot states at two points inside InAs nanowires, nearly perfect quantum rings form. Large and highly anisotropic effective g-factors are observed, explained by a strong orbital contribution. Importantly, we find that the orbital contributions can be efficiently quenched by simply... (More)
Emerging theoretical concepts for quantum technologies have driven a continuous search for structures where a quantum state, such as spin, can be manipulated efficiently. Central to many concepts is the ability to control a system by electric and magnetic fields, relying on strong spin-orbit interaction and a large g-factor. Here, we present a mechanism for spin and orbital manipulation using small electric and magnetic fields. By hybridizing specific quantum dot states at two points inside InAs nanowires, nearly perfect quantum rings form. Large and highly anisotropic effective g-factors are observed, explained by a strong orbital contribution. Importantly, we find that the orbital contributions can be efficiently quenched by simply detuning the individual quantum dot levels with an electric field. In this way, we demonstrate not only control of the effective g-factor from 80 to almost 0 for the same charge state, but also electrostatic change of the ground state spin. (Less)
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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nature Communications
volume
10
issue
1
article number
5740
publisher
Nature Publishing Group
external identifiers
  • scopus:85076613083
  • pmid:31844044
ISSN
2041-1723
DOI
10.1038/s41467-019-13583-7
language
English
LU publication?
yes
id
bee78908-0f21-4723-bc6f-940d39096368
date added to LUP
2019-12-16 16:20:37
date last changed
2020-09-23 08:01:59
@article{bee78908-0f21-4723-bc6f-940d39096368,
  abstract     = {Emerging theoretical concepts for quantum technologies have driven a continuous search for structures where a quantum state, such as spin, can be manipulated efficiently. Central to many concepts is the ability to control a system by electric and magnetic fields, relying on strong spin-orbit interaction and a large g-factor. Here, we present a mechanism for spin and orbital manipulation using small electric and magnetic fields. By hybridizing specific quantum dot states at two points inside InAs nanowires, nearly perfect quantum rings form. Large and highly anisotropic effective g-factors are observed, explained by a strong orbital contribution. Importantly, we find that the orbital contributions can be efficiently quenched by simply detuning the individual quantum dot levels with an electric field. In this way, we demonstrate not only control of the effective g-factor from 80 to almost 0 for the same charge state, but also electrostatic change of the ground state spin.},
  author       = {Potts, H. and Chen, I.–J. and Tsintzis, A. and Nilsson, M. and Lehmann, S. and Dick, K. A. and Leijnse, M. and Thelander, C.},
  issn         = {2041-1723},
  language     = {eng},
  month        = {12},
  number       = {1},
  publisher    = {Nature Publishing Group},
  series       = {Nature Communications},
  title        = {Electrical control of spins and giant g-factors in ring-like coupled quantum dots},
  url          = {http://dx.doi.org/10.1038/s41467-019-13583-7},
  doi          = {10.1038/s41467-019-13583-7},
  volume       = {10},
  year         = {2019},
}