Phys. Rev. Lett. 94, 136407 (2005) [4 pages]Coherence of Elementary Excitations in a Disordered Electron SystemReceived 7 January 2004; revised 22 December 2004; published 8 April 2005 The localization properties of the single-particle and collective electron excitations were investigated in the intentionally disordered GaAs/AlGaAs superlattices by weak-field magnetoresistance and Raman scattering. The localization length of the individual electron was found to be considerably larger than that of the collective excitations. This suggests that the disorder has a weaker effect on the electrons than on their collective motion and that the interaction which gives rise to the collective effects increases localization. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.136407
DOI:
10.1103/PhysRevLett.94.136407
PACS:
71.45.-d, 71.23.An, 71.55.Jv, 72.15.Rn
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