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Low percolation density and charge noise with holes in germanium

Journal Article (2021)
Author(s)

M. Lodari (TU Delft - QCD/Scappucci Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)

N.W. Hendrickx (TU Delft - QCD/Veldhorst Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)

W.I.L. Lawrie (TU Delft - QCD/Veldhorst Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)

T. Hsiao (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QCD/Vandersypen Lab)

L.M.K. Vandersypen (TU Delft - QuTech Advanced Research Centre, TU Delft - QN/Vandersypen Lab, Kavli institute of nanoscience Delft)

A. Sammak (TU Delft - QuTech Advanced Research Centre, TU Delft - BUS/TNO STAFF)

M. Veldhorst (TU Delft - QuTech Advanced Research Centre, TU Delft - QN/Veldhorst Lab, Kavli institute of nanoscience Delft)

G. Scappucci (TU Delft - QCD/Scappucci Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)

DOI related publication
https://doi.org/10.1088/2633-4356/abcd82 Final published version
More Info
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Publication Year
2021
Language
English
Journal title
Materials for Quantum Technology
Issue number
1
Volume number
1
Article number
011002
Downloads counter
394
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Abstract

We engineer planar Ge/SiGe heterostructures for low disorder and quiet hole quantum dot operation by positioning the strained Ge channel 55 nm below the semiconductor/dielectric interface. In heterostructure field effect transistors, we measure a percolation density for two-dimensional hole transport of 2.1 × 10 10 cm−2 , indicative of a very low disorder potential landscape experienced by holes in the buried Ge channel. These Ge heterostructures support quiet
operation of hole quantum dots and we measure an average charge noise level of √SE = 0.6 μeV/√Hz at 1 Hz, with the lowest level below our detection limit√SE = 0.2 μeV/√Hz. These results establish planar Ge as a promising platform for scaledtwo-dimensional spin qubit arrays