g-factor and well-width fluctuations as a function of carrier density in the two-dimensional hole accumulation layer of transfer-doped diamond

Golrokh Akhgar, Lothar Ley, Daniel L. Creedon, Alastair Stacey, Jeffrey C. McCallum, Alex R. Hamilton, and Christopher I. Pakes
Phys. Rev. B 99, 035159 – Published 29 January 2019
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Abstract

The two-dimensional (2D) hole gas at the surface of transfer-doped diamond shows quantum-mechanical interference effects in magnetoresistance in the form of weak localization and weak antilocalization (WAL) at temperatures below about 5 K. Here we use the quenching of the WAL by an additional magnetic field applied parallel to the 2D plane to extract the magnitude of the in-plane g-factor of the holes and fluctuations in the well width as a function of carrier density. Carrier densities are varied between 1.71 and 4.35×1013cm2 by gating a Hall bar device with an ionic liquid. Over this range, calculated values of |g| vary between 1.6 and 2.3 and the extracted well-width variation drops from 3 to 1.3 nm rms over the phase coherence length of 33 nm for a fixed geometrical surface roughness of about 1 nm as measured by atomic force microscopy. Possible mechanisms for the extracted variations in the presence of the ionic liquid are discussed.

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  • Received 9 October 2018
  • Revised 11 January 2019

DOI:https://doi.org/10.1103/PhysRevB.99.035159

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Golrokh Akhgar1,*, Lothar Ley1,2, Daniel L. Creedon3, Alastair Stacey3, Jeffrey C. McCallum3, Alex R. Hamilton4, and Christopher I. Pakes1,†

  • 1Department of Chemistry and Physics, La Trobe University, Victoria 3086, Australia
  • 2Institute of Condensed Matter Physics, Universität Erlangen, Staudt-Str. 1, 91058 Erlangen, Germany
  • 3School of Physics, The University of Melbourne, Victoria 3010, Australia
  • 4School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia

  • *g.akhgar@latrobe.edu.au
  • c.pakes@latrobe.edu.au

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Issue

Vol. 99, Iss. 3 — 15 January 2019

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