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Electron-hole interactions in coupled InAs-GaSb quantum dots based on nanowire crystal phase templates

Nilsson, Malin LU ; Namazi, Luna LU ; Lehmann, Sebastian LU ; Leijnse, Martin LU ; Dick, Kimberly A. LU and Thelander, Claes LU (2016) In Physical Review B (Condensed Matter and Materials Physics) 94(11).
Abstract

We report growth and characterization of a coupled quantum dot structure that utilizes nanowire templates for selective epitaxy of radial heterostructures. The starting point is a zinc blende InAs nanowire with thin segments of wurtzite structure. These segments have dual roles: they act as tunnel barriers for electron transport in the InAs core, and they also locally suppress growth of a GaSb shell, resulting in coaxial InAs-GaSb quantum dots with integrated electrical probes. The parallel quantum dot structure hosts spatially separated electrons and holes that interact due to the type-II broken gap of InAs-GaSb heterojunctions. The Coulomb blockade in the electron and hole transport is studied, and periodic interactions of electrons... (More)

We report growth and characterization of a coupled quantum dot structure that utilizes nanowire templates for selective epitaxy of radial heterostructures. The starting point is a zinc blende InAs nanowire with thin segments of wurtzite structure. These segments have dual roles: they act as tunnel barriers for electron transport in the InAs core, and they also locally suppress growth of a GaSb shell, resulting in coaxial InAs-GaSb quantum dots with integrated electrical probes. The parallel quantum dot structure hosts spatially separated electrons and holes that interact due to the type-II broken gap of InAs-GaSb heterojunctions. The Coulomb blockade in the electron and hole transport is studied, and periodic interactions of electrons and holes are observed and can be reproduced by modeling. Distorted Coulomb diamonds indicate voltage-induced ground-state transitions, possibly a result of changes in the spatial distribution of holes in the thin GaSb shell.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
94
issue
11
publisher
American Physical Society
external identifiers
  • scopus:84991011497
  • wos:000385047300004
ISSN
1098-0121
DOI
10.1103/PhysRevB.94.115313
language
English
LU publication?
yes
id
9362119a-95c9-428e-89df-da1b7409d18f
date added to LUP
2016-11-02 15:07:17
date last changed
2017-04-09 04:51:13
@article{9362119a-95c9-428e-89df-da1b7409d18f,
  abstract     = {<p>We report growth and characterization of a coupled quantum dot structure that utilizes nanowire templates for selective epitaxy of radial heterostructures. The starting point is a zinc blende InAs nanowire with thin segments of wurtzite structure. These segments have dual roles: they act as tunnel barriers for electron transport in the InAs core, and they also locally suppress growth of a GaSb shell, resulting in coaxial InAs-GaSb quantum dots with integrated electrical probes. The parallel quantum dot structure hosts spatially separated electrons and holes that interact due to the type-II broken gap of InAs-GaSb heterojunctions. The Coulomb blockade in the electron and hole transport is studied, and periodic interactions of electrons and holes are observed and can be reproduced by modeling. Distorted Coulomb diamonds indicate voltage-induced ground-state transitions, possibly a result of changes in the spatial distribution of holes in the thin GaSb shell.</p>},
  articleno    = {115313},
  author       = {Nilsson, Malin and Namazi, Luna and Lehmann, Sebastian and Leijnse, Martin and Dick, Kimberly A. and Thelander, Claes},
  issn         = {1098-0121},
  language     = {eng},
  month        = {09},
  number       = {11},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Electron-hole interactions in coupled InAs-GaSb quantum dots based on nanowire crystal phase templates},
  url          = {http://dx.doi.org/10.1103/PhysRevB.94.115313},
  volume       = {94},
  year         = {2016},
}