Physical Review Research (Apr 2021)

Superballistic electron flow through a point contact in a Ga[Al]As heterostructure

  • Lev V. Ginzburg,
  • Carolin Gold,
  • Marc P. Röösli,
  • Christian Reichl,
  • Matthias Berl,
  • Werner Wegscheider,
  • Thomas Ihn,
  • Klaus Ensslin

DOI
https://doi.org/10.1103/PhysRevResearch.3.023033
Journal volume & issue
Vol. 3, no. 2
p. 023033

Abstract

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We measure electronic transport through point contacts in a high-mobility electron gas in a Ga[Al]As heterostructure at different temperatures and bulk electron densities. The conductance through all point contacts increases with increasing temperature in a temperature window around T∼10K for all investigated electron densities and point contact widths. For high electron densities this conductance exceeds the fundamental ballistic limit (Sharvin limit). These observations are in agreement with a viscous electron transport model and previous experiments in graphene.