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Title: Enhancement-mode two-channel triple quantum dot from an undoped Si/Si0.8Ge0.2 quantum well hetero-structure

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.5023596· OSTI ID:1457184
ORCiD logo [1];  [1];  [2];  [1];  [1]
  1. National Research Council of Canada, Ottawa, ON (Canada)
  2. National Research Council of Canada, Ottawa, ON (Canada); Tohoku Univ., Miyagi (Japan)

Here, we demonstrate coupled triple dot operation and charge sensing capability for the recently introduced quantum dot technology employing undoped Si/Si0.8Ge0.2 hetero-structures which also incorporate a single metal-gate layer to simplify fabrication. Si/SiGe hetero-structures with a Ge concentration of 20% rather than the more usual 30% typically encountered offer higher electron mobility. The devices consist of two in-plane parallel electron channels that host a double dot in one channel and a single dot in the other channel. In a device where the channels are sufficiently close a triple dot in a triangular configuration is induced leading to regions in the charge stability diagram where three charge-addition lines of different slope approach each other and anti-cross. In a device where the channels are further apart, the single dot charge-senses the double dot with relative change of ~2% in the sensor current.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1457184
Report Number(s):
SAND-2017-13809J; 659682
Journal Information:
Applied Physics Letters, Vol. 112, Issue 23; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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Cited By (6)

Capillary-driven elastic attraction between quantum dots journal January 2019
Quantum dots with split enhancement gate tunnel barrier control journal February 2019
Applied Physics Letters welcomes papers in Quantum Technologies journal January 2020
Single and double hole quantum dots in strained Ge/SiGe quantum wells journal March 2019
Spin-Blockade Spectroscopy of Si / Si - Ge Quantum Dots journal July 2019
Single and Double Hole Quantum Dots in Strained Ge/SiGe Quantum Wells text January 2018

Figures / Tables (5)