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Side-gated, enhancement mode, InAs nanowire double quantum dot devices-toward controlling transverse electric fields in spin-transport measurements

Dorsch, S. LU ; Dalelkhan, B. LU ; Fahlvik, S. LU and Burke, A. M. LU (2019) In Nanotechnology 30(14).
Abstract

A double quantum dot system with a definitive transverse electric field in the plane of the sample is defined by combining a facile side-gating technique with enhancement mode InAs nanowires. Positive bias on the plunger gates enhance quantum dot segments along the nanowire, negative bias on barrier gates deplete regions, and situating gates biased at opposite polarities on opposing sides of the nanowire allows an electric field to be engineered. With sufficiently biased barrier regions stable bias triangle features are observed in the weak interdot coupling regime. The singlet-triplet energy splitting Δ ST in Pauli spin-blockaded features is studied as a function of an external magnetic field applied perpendicular to the sample plane.... (More)

A double quantum dot system with a definitive transverse electric field in the plane of the sample is defined by combining a facile side-gating technique with enhancement mode InAs nanowires. Positive bias on the plunger gates enhance quantum dot segments along the nanowire, negative bias on barrier gates deplete regions, and situating gates biased at opposite polarities on opposing sides of the nanowire allows an electric field to be engineered. With sufficiently biased barrier regions stable bias triangle features are observed in the weak interdot coupling regime. The singlet-triplet energy splitting Δ ST in Pauli spin-blockaded features is studied as a function of an external magnetic field applied perpendicular to the sample plane. We interpret an apparent absence of mixing between singlet and triplet states as an indication that the spin-orbit field is oriented out of the sample plane due to the induced electric field. Finally, we discuss the potential of combining advanced gating architectures with enhancement mode nanowires to control the orientation of the spin-orbit field-a prospect that could enable multiple, nanowire-based spin-qubits to be operated on a single chip with a fixed-angle external magnetic field applied.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nanotechnology
volume
30
issue
14
article number
144002
publisher
IOP Publishing
external identifiers
  • pmid:30641514
  • scopus:85061241132
ISSN
0957-4484
DOI
10.1088/1361-6528/aafe5a
language
English
LU publication?
yes
id
3192deaa-f004-4c8b-98fa-1957590ee70d
date added to LUP
2019-02-18 13:50:54
date last changed
2020-01-13 01:29:32
@article{3192deaa-f004-4c8b-98fa-1957590ee70d,
  abstract     = {<p>A double quantum dot system with a definitive transverse electric field in the plane of the sample is defined by combining a facile side-gating technique with enhancement mode InAs nanowires. Positive bias on the plunger gates enhance quantum dot segments along the nanowire, negative bias on barrier gates deplete regions, and situating gates biased at opposite polarities on opposing sides of the nanowire allows an electric field to be engineered. With sufficiently biased barrier regions stable bias triangle features are observed in the weak interdot coupling regime. The singlet-triplet energy splitting Δ ST in Pauli spin-blockaded features is studied as a function of an external magnetic field applied perpendicular to the sample plane. We interpret an apparent absence of mixing between singlet and triplet states as an indication that the spin-orbit field is oriented out of the sample plane due to the induced electric field. Finally, we discuss the potential of combining advanced gating architectures with enhancement mode nanowires to control the orientation of the spin-orbit field-a prospect that could enable multiple, nanowire-based spin-qubits to be operated on a single chip with a fixed-angle external magnetic field applied.</p>},
  author       = {Dorsch, S. and Dalelkhan, B. and Fahlvik, S. and Burke, A. M.},
  issn         = {0957-4484},
  language     = {eng},
  number       = {14},
  publisher    = {IOP Publishing},
  series       = {Nanotechnology},
  title        = {Side-gated, enhancement mode, InAs nanowire double quantum dot devices-toward controlling transverse electric fields in spin-transport measurements},
  url          = {http://dx.doi.org/10.1088/1361-6528/aafe5a},
  doi          = {10.1088/1361-6528/aafe5a},
  volume       = {30},
  year         = {2019},
}