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Ergodic versus diffusive decoherence in mesoscopic devices
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DOI：10.1103/PhysRevB.87.041307.png)
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We report on the measurement of phase coherence length in a high-mobility two-dimensional electron gas patterned in two different geometries, a wire and a ring. The phase coherence length is extracted both from the weak localization correction in long wires and from the amplitude of the Aharonov-Bohm oscillations in a single ring, in a low-temperature regime when decoherence is dominated by electronic interactions. We show that these two measurements lead to different phase coherence lengths, namely L-Phi(wire) alpha T-1/3 and L-Phi(ring) alpha T-1/2. This difference reflects the fact that the electrons winding around the ring necessarily explore the whole sample (ergodic trajectories), while in a long wire the electrons lose their phase coherence before reaching the edges of the sample (diffusive regime). DOI: 10.1103/PhysRevB.87.041307
Keyword:
WEAK-LOCALIZATION
BOUNDARY SCATTERING
MAGNETIC-FIELD
COHERENCE
ELECTRONS
期刊
IF:
3.7
论文数:
15.4W
被引数:
41.0W
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Thermal noise and dephasing due to electron interactions in nontrivial geometries.png)
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