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28 March 2024
 
  » arxiv » physics/0503071

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Macroscopic coherence effects in a mesoscopic system: Weak localization of thin silver films in an undergraduate lab
A.D. Beyer ; M. Koesters ; K.G. Libbrecht ; E.D. Black ;
Date 9 Mar 2005
Subject Physics Education | physics.ed-ph
AbstractWe present an undergraduate lab that investigates weak localization in thin silver films. The films prepared in our lab have thickness, $a$, between 60-200 AA, a mesoscopic length scale. At low temperatures, the inelastic dephasing length for electrons, $L_{phi}$, exceeds the thickness of the film ($L_{phi} gg a$), and the films are then quasi-2D in nature. In this situation, theory predicts specific corrections to the Drude conductivity due to coherent interference between conducting electrons’ wavefunctions, a macroscopically observable effect known as weak localization. This correction can be destroyed with the application of a magnetic field, and the resulting magnetoresistance curve provides information about electron transport in the film. This lab is suitable for Junior or Senior level students in an advanced undergraduate lab course.
Source arXiv, physics/0503071
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