Mesoscopic decoherence in Aharonov-Bohm rings
A. E. Hansen, A. Kristensen, S. Pedersen, C. B. Sorensen, P. E. Lindelof
Abstract
We study electron decoherence by measuring the temperature dependence of Aharonov-Bohm (AB) oscillations in quasi-1D rings, etched in a high-mobility GaAs/GaAlAs heterostructure. The oscillation amplitude is influenced both by phase-breaking and by thermal averaging. Thermal averaging is important when the temperature approaches the energy scale, on which the AB oscillations shift their phase. For the phase-breaking, it is demonstrated that the damping of the oscillation amplitude is proportional to the length of the interfering paths. For temperatures T from 0.3 to 4 K we find the phase coherence length Lϕ T-1, close to what has been reported for open quantum dots. This might indicate that the T-1 decoherence rate is a general property of open and ballistic mesoscopic systems.
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