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The role of lead openings in regular mesoscopic billiards

✍ Scribed by J.P. Bird; D.K. Ferry; R. Akis; R. Newbury; R.P. Taylor; D.M. Olatona; Y. Ochiai; K. Ishibashi; Y. Aoyagi; T. Sugano

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 226 KB
Volume: 20
Category: Article
ISSN: 0749-6036
DOI: 10.1006/spmi.1996.0080

No coin nor oath required. For personal study only.

✦ Synopsis

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 quasiperiodicity, 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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