Imaging cyclotron orbits and scattering sites in a high-mobility two-dimensional electron gas

R. Crook, C. G. Smith, M. Y. Simmons, and D. A. Ritchie
Phys. Rev. B 62, 5174 – Published 15 August 2000
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Abstract

We present experimental images and computer simulations of electron and conduction-band-hole trajectories transmitted between two series constrictions in a two-dimensional electron gas formed at a GaAs/AlGaAs heterojunction. The electric perturbation of a scanning charged probe modified the trajectories to generate the experimental images. In a weak magnetic field, the images revealed cyclotron orbits allowing a measurement of electron and conduction-band-hole energies. Using the same technique, a scattering site caused a 26° change in the trajectories. Computer simulations with localized charge fluctuations in the donor layer, which locally distort the conduction band by 24% of the Fermi energy, reproduced structures seen in the experimental images and features in a related magnetic steering experiment. Conduction-band-holes are holelike quasiparticles in the conduction band with an energy less than the Fermi energy, being equivalent to unoccupied electron states.

  • Received 23 September 1999

DOI:https://doi.org/10.1103/PhysRevB.62.5174

©2000 American Physical Society

Authors & Affiliations

R. Crook, C. G. Smith, M. Y. Simmons, and D. A. Ritchie

  • Department of Physics, Cavendish Laboratory, Madingley Road, Cambridge, CB3 OHE, United Kingdom

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Vol. 62, Iss. 8 — 15 August 2000

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