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Mesoscopic decoherence in Aharonov-Bohm rings | | A.E. Hansen
; A. Kristensen
; S. Pedersen
; C.B. Sorensen
; P.E. Lindelof
; | | Date: |
6 Feb 2001 | | Subject: | Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall | | 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 $
m K$ we find the phase coherence length $it L_{phi}$ $propto$ $T^{-1}$, 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. | | Source: | arXiv, cond-mat/0102096 | | Services: | Forum | Review | PDF | Favorites | |
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