Conductance Fluctuations in PbSe: Manifestation of Ballistic Transport in Macroscale?
G. Grabecki, S. Takeyama, S. Adachi, Y. Takagi
Himeji Inst. of Technology, Faculty of Science, 1479-1 Kanaji, Kamigori-cho, Akogun, Hyogo, 678-12 Japan

T. Dietl
Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland

E. Kamińska, A. Piotrowska, E. Papis
Institute of Electron Technology, Al. Lotników 32/46, 02-668 Warszawa, Poland

N. Frank and G. Bauer
Institut für Halbleiterphysik, Johannes Kepler Universität Linz, 4040 Linz, Austria
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Precise magnetoresistance measurements on microstructures of photolithographically patterned PbSe epilayers have been performed in the mag­netic field range up to 17 Τ. Unusually large, reproducible magnetoconductance fluctuations have been observed. The fluctuation amplitude decreases exponentially with the magnetic field. A correlation magnetic field of the fluctuations corresponds to the Aharonov-Bohm effect which involves elec­tron trajectories much smaller than the electron mean free path. This points strongly to the ballistic, not diffusive, origin of the observed phenomenon.
DOI: 10.12693/APhysPolA.88.727
PACS numbers: 71.55.Jv