Effect of a Voltage Probe on the Phase-Coherent Conductance of a Ballistic Chaotic Cavity

Details Effect of a Voltage Probe on the Phase-Coherent Conductance of a Ballistic Chaotic Cavity Effect of a Voltage Probe on the Phase-Coherent Conductance of a Ballistic Chaotic Cavity

1994-10-20

arxiv.org/abs/cond-mat/9410076v1

Phys.Rev.B 51 (1995) 7739

Physics

Condensed Matter

9 pages, REVTeX-3.0, 4 postscript figures appended as self-extracting archive, INLO-PUB-941020b

Scientific paper

10.1103/PhysRevB.51.7739

The effect of an invasive voltage probe on the phase-coherent conduction through a ballistic chaotic cavity is investigated by random-matrix theory. The entire distribution P(G) of the conductance G is computed for the case that the cavity is coupled to source and drain by two point contacts with a quantized conductance of 2 e^2/h, both in the presence (beta = 1) and absence (beta = 2) of time-reversal symmetry. The loss of phase-coherence induced by the voltage probe causes a crossover from P(G) ~ G^(-1 + beta/2) to a Gaussian centered at G = e^2/h with a beta-dependent width. ***Submitted to Physical Review B.***

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