Macroscopic coherence effects in a mesoscopic system: Weak localization of thin silver films

Abstract

We present an advanced undergraduate experiment on weak localization in thin silver films with a thickness between 60–200 Å, a mesoscopic length scale. At low temperatures, the inelastic dephasing length for electrons exceeds the film thickness, and the film becomes quasi-two-dimensional. In this limit, theory predicts corrections to the Drude conductivity due to the coherent interference between the wave functions of the conducting electrons, a macroscopically observable effect known as weak localization. This correction can be destroyed by the application of a magnetic field, and the resulting magnetoresistance curve provides information about electron transport in the film. © 2005 American Association of Physics Teachers. DOI: 10.1119/1.2049284

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@inproceedings{Beyer2005MacroscopicCE, title={Macroscopic coherence effects in a mesoscopic system: Weak localization of thin silver films}, author={Andrew D Beyer and Michael K{\"{o}sters and Kenneth G. Libbrecht}, year={2005} }