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Quantum ballistic transport in strained epitaxial germanium

Gul, Y; Holmes, SN; Newton, PJ; Ellis, DJP; Morrison, C; Pepper, M; Barnes, CHW; (2017) Quantum ballistic transport in strained epitaxial germanium. Applied Physics Letters , 111 , Article 233512. 10.1063/1.5008969. Green open access

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Abstract

Large scale fabrication using Complementary Metal Oxide Semiconductor compatible technology of semiconductor nanostructures that operate on the principles of quantum transport is an exciting possibility now due to the recent development of ultra-high mobility hole gases in epitaxial germanium grown on standard silicon substrates. We present here a ballistic transport study of patterned surface gates on strained Ge quantum wells with SiGe barriers, which confirms the quantum characteristics of the Ge heavy hole valence band structure in 1-dimension. Quantised conductance at multiples of 2e2/h is a universal feature of hole transport in Ge up to 10 x (2e2/h). The behaviour of ballistic plateaus with finite source-drain bias and applied magnetic field is elucidated. In addition, a reordering of the ground state is observed.

Type: Article
Title: Quantum ballistic transport in strained epitaxial germanium
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.5008969
Publisher version: https://doi.org/10.1063/1.5008969
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Physics, Applied, Physics, POINT-CONTACT, ELECTRON-GAS, HETEROSTRUCTURES
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10041343
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