Phys. Rev. Lett. 69, 506–509 (1992)Conductance fluctuations and chaotic scattering in ballistic microstructuresReceived 9 January 1992; published in the issue dated 20 July 1992 We report detailed measurements of the low-temperature magnetoconductance in ballistic microstructures in the shape of a ‘‘chaotic’’ stadium and a circle with quantum-point-contact leads. Both structures show large, aperiodic, conductance fluctuations as a function of perpendicular magnetic field, and a zero-field resistance peak indicating geometry-dependent enhanced backscattering. Power spectra of fluctuations are consistent with recent semiclassical analyses based on quantum chaotic scattering, with the circle showing enhanced high-frequency spectral content. © 1992 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.69.506
DOI:
10.1103/PhysRevLett.69.506
PACS:
73.20.Dx, 05.45.+b, 72.20.My, 73.20.Fz
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