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The role of lead openings in regular mesoscopic billiards

Authors
Journal
Superlattices and Microstructures
0749-6036
Publisher
Elsevier
Publication Date
Volume
20
Issue
3
Identifiers
DOI: 10.1006/spmi.1996.0080
Disciplines
  • Physics

Abstract

Abstract We discuss the results of experimental studies of ballistic electron transport in regular (i.e. non-chaotic) quantum dots. At low temperatures, coherent interference between electrons gives rise to reproducible fluctuations in the magneto-resistance, as well as to a weak localization peak near zero field. The lineshape of the peak evolves from a Lorentzian to a linear form, as the leads of the dot are closed, while the fluctuations exhibit striking quasi-periodicity, suggesting that transport through regular dots is dominated by just a small group of trajectories. Simulations show that these characteristics in turn result from the ability of the quantum point contact leads, to strongly select which trajectories participate in transport.

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