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Ballistic Conductance Fluctuations in Shape Space

1995; American Physical Society; Volume: 74; Issue: 19 Linguagem: Inglês

10.1103/physrevlett.74.3876

1092-0145

Ian Chan, R. M. Clarke, C. M. Marcus, K. L. Campman, A. C. Gossard,

Quantum chaos and dynamical systems

Ballistic conductance fluctuations were measured in a GaAs quantum dot as a function of shape distortion and magnetic field. Shape distortion provides a novel source of conductance fluctuations and creates an effective ``ensemble of dots,'' allowing statistics to be studied at fixed field. Continuous changes in fluctuation statistics due to breaking of time-reversal symmetry are seen about zero magnetic field. Throughout, conductance fluctuation distributions appear Gaussian. The power spectrum of shape fluctuations appears exponential over three decades.