Polaronic quasiparticle picture for generation dynamics of coherent phonons in semiconductors: Transient and nonlinear Fano resonance

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Bibliographic Information

Published
2017-01
Resource Type
journal article
Rights Information
  • © 2017 American Physical Society
DOI
  • 10.1103/physrevb.95.014301
  • 10.48550/arxiv.1510.00263
Publisher
American Physical Society

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Description

We examine generation dynamics of coherent phonons (CPs) in both of polar and non-polar semiconductors -- such as GaAs and Si -- based on a polaronic-quasiparticle (PQ) model. In the model concerned, the PQ operator is composed of two kinds of operators. One is a quasiboson operator -- defined as a linear combination of a set of pairs of electron operators -- and the other is a longitudinal optical (LO) phonon operator. The problem of transient and non-linear Fano resonance (FR) is tackled in particular; the vestige of this quantum interference effect was observed exclusively in lightly $n$-doped Si immediately after carriers were excited by an ultrashort pulse-laser [M. Hase et. al., Nature 426, 51 (2003)], though not observed yet in GaAs. It is shown that the phonon energy state is embedded in a continuum state formed by a set of adiabatic eigenstates of the quasiboson. This result implies the possibility of manifestation of the transient FR in the present optically-non-linear system.

28 pages, 13 figures

Journal

  • Physical review B

    Physical review B 95 (1), 014301-, 2017-01

    American Physical Society

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