Three Key Questions on Fractal Conductance Fluctuations: Dynamics, Quantization and Coherence

Details Three Key Questions on Fractal Conductance Fluctuations: Dynamics, Quantization and Coherence Three Key Questions on Fractal Conductance Fluctuations: Dynamics, Quantization and Coherence

2003-06-22

arxiv.org/abs/cond-mat/0306550v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

17 pages, 4 figures, in press for Physical Review B

Scientific paper

10.1103/PhysRevB.70.085302

Recent investigations of fractal conductance fluctuations (FCF) in electron billiards reveal crucial discrepancies between experimental behavior and the semiclassical Landauer-Buttiker (SLB) theory that predicted their existence. In particular, the roles played by the billiard's geometry, potential profile and the resulting electron trajectory distribution are not well understood. We present measurements on two custom-made devices - a 'disrupted' billiard device and a 'bilayer' billiard device - designed to probe directly these three characteristics. Our results demonstrate that intricate processes beyond those proposed in the SLB theory are required to explain FCF.

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