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Coherent Transport in a Linear Triple Quantum Dot Made from a Pure-Phase InAs Nanowire

Wang, Ji Yin; Huang, Shaoyun; Huang, Guang Yao; Pan, Dong; Zhao, Jianhua and Xu, H. Q. LU (2017) In Nano Letters 17(7). p.4158-4164
Abstract

A highly tunable linear triple quantum dot (TQD) device is realized in a single-crystalline pure-phase InAs nanowire using a local finger gate technique. The electrical measurements show that the charge stability diagram of the TQD can be represented by three kinds of current lines of different slopes and a simulation performed based on a capacitance matrix model confirms the experiment. We show that each current line observable in the charge stability diagram is associated with a case where a QD is on resonance with the Fermi level of the source and drain reservoirs. At a triple point where two current lines of different slopes move together but show anticrossing, two QDs are on resonance with the Fermi level of the reservoirs. We... (More)

A highly tunable linear triple quantum dot (TQD) device is realized in a single-crystalline pure-phase InAs nanowire using a local finger gate technique. The electrical measurements show that the charge stability diagram of the TQD can be represented by three kinds of current lines of different slopes and a simulation performed based on a capacitance matrix model confirms the experiment. We show that each current line observable in the charge stability diagram is associated with a case where a QD is on resonance with the Fermi level of the source and drain reservoirs. At a triple point where two current lines of different slopes move together but show anticrossing, two QDs are on resonance with the Fermi level of the reservoirs. We demonstrate that an energetically degenerated quadruple point at which all three QDs are on resonance with the Fermi level of the reservoirs can be built by moving two separated triple points together via sophistically tuning of energy levels in the three QDs. We also demonstrate the achievement of direct coherent electron transfer between the two remote QDs in the TQD, realizing a long-distance coherent quantum bus operation. Such a long-distance coherent coupling could be used to investigate coherent spin teleportation and superexchange effects and to construct a spin qubit with an improved long coherent time and with spin state detection solely by sensing the charge states.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
coherent transport, cotunneling, InAs nanowire, Triple quantum dot
in
Nano Letters
volume
17
issue
7
pages
7 pages
publisher
The American Chemical Society
external identifiers
  • scopus:85024100308
  • wos:000405643300023
ISSN
1530-6984
DOI
10.1021/acs.nanolett.7b00927
language
English
LU publication?
yes
id
d645fd5b-6d13-4990-80ce-4cfe131b8f01
date added to LUP
2017-07-27 10:44:45
date last changed
2017-09-18 11:40:02
@article{d645fd5b-6d13-4990-80ce-4cfe131b8f01,
  abstract     = {<p>A highly tunable linear triple quantum dot (TQD) device is realized in a single-crystalline pure-phase InAs nanowire using a local finger gate technique. The electrical measurements show that the charge stability diagram of the TQD can be represented by three kinds of current lines of different slopes and a simulation performed based on a capacitance matrix model confirms the experiment. We show that each current line observable in the charge stability diagram is associated with a case where a QD is on resonance with the Fermi level of the source and drain reservoirs. At a triple point where two current lines of different slopes move together but show anticrossing, two QDs are on resonance with the Fermi level of the reservoirs. We demonstrate that an energetically degenerated quadruple point at which all three QDs are on resonance with the Fermi level of the reservoirs can be built by moving two separated triple points together via sophistically tuning of energy levels in the three QDs. We also demonstrate the achievement of direct coherent electron transfer between the two remote QDs in the TQD, realizing a long-distance coherent quantum bus operation. Such a long-distance coherent coupling could be used to investigate coherent spin teleportation and superexchange effects and to construct a spin qubit with an improved long coherent time and with spin state detection solely by sensing the charge states.</p>},
  author       = {Wang, Ji Yin and Huang, Shaoyun and Huang, Guang Yao and Pan, Dong and Zhao, Jianhua and Xu, H. Q.},
  issn         = {1530-6984},
  keyword      = {coherent transport,cotunneling,InAs nanowire,Triple quantum dot},
  language     = {eng},
  month        = {07},
  number       = {7},
  pages        = {4158--4164},
  publisher    = {The American Chemical Society},
  series       = {Nano Letters},
  title        = {Coherent Transport in a Linear Triple Quantum Dot Made from a Pure-Phase InAs Nanowire},
  url          = {http://dx.doi.org/10.1021/acs.nanolett.7b00927},
  volume       = {17},
  year         = {2017},
}