Direct measurement of the phase coherence length in a GaAs/GaAlAs square network

Details Direct measurement of the phase coherence length in a GaAs/GaAlAs square network Direct measurement of the phase coherence length in a GaAs/GaAlAs square network

2004-02-20

arxiv.org/abs/cond-mat/0402534v2

Physical Review Letters 93 (2004) 246804

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Additional experimental data in version 2

Scientific paper

10.1103/PhysRevLett.93.246804

The low temperature magnetoconductance of a large array of quantum coherentloops exhibits Altshuler-Aronov-Spivak oscillations which periodicitycorresponds to 1/2 flux quantum per loop.We show that the measurement of the harmonics content in a square networkprovides an accurate way to determine the electron phase coherence length$L\_{\phi}$ in units of the lattice length without any adjustableparameters.We use this method to determine $L\_{\phi}$ in a network realised from a 2Delectron gas (2DEG) in a GaAS/GaAlAs heterojunction. The temperaturedependence follows a power law $T^{-1/3}$ from 1.3 K to 25 mK with nosaturation, as expected for 1D diffusive electronic motion andelectron-electron scattering as the main decoherence mechanism.

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