Phonon-Induced Decoherence in Electron Evolution

  • Philipp Schwaha
  • Mihail Nedjalkov
  • Siegfried Selberherr
  • Ivan Dimov
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7116)

Abstract

A Monte Carlo analysis of the evolution of an electron interacting with phonons is presented in terms of a Wigner function. The initial electron state is constructed by a superposition of two wave packets and a pronounced interference term. The results show that phonons effectively destroy the interference term. The initial coherence in wave vector distribution is pushed towards the equilibrium distribution. Phonons hinder the natural spread of the density with time and advance it towards a classical localization. The decoherence effect due to phonons, which brings about the transition from a quantum to a classical state, is demonstrated by the purity of the state, which decreases from its initial value of 1, with a rate depending on the lattice temperature.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Philipp Schwaha
    • 2
    • 1
  • Mihail Nedjalkov
    • 1
    • 3
  • Siegfried Selberherr
    • 1
  • Ivan Dimov
    • 3
  1. 1.Institute for MicroelectronicsTU WienViennaAustria
  2. 2.Shenteq s.r.o.BratislavaSlovak Republic
  3. 3.Institute of Information and Communication TechnlogiesBulgarian Academy of SciencesSofiaBulgaria

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