Beyer, A. D. and Koesters, M. and Libbrecht, K. G. and Black, E. D. (2005) Macroscopic coherence effects in a mesoscopic system: Weak localization of thin silver films. American Journal of Physics, 73 (11). pp. 1014-1019. ISSN 0002-9505. http://resolver.caltech.edu/CaltechAUTHORS:BEYajp05
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We present an advanced undergraduate experiment on weak localization in thin silver films with a thickness between 60-200 angstrom, 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.
|Additional Information:||©2005 American Association of Physics Teachers. Received: 9 March 2005; accepted: 29 July 2005. This work was supported by the National Science Foundation under Grant No. DUE-0088658.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Lindsay Cleary|
|Deposited On:||15 Sep 2006|
|Last Modified:||26 Dec 2012 09:02|
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