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Nonperturbative Quantum Nature of the Dislocation–Phonon Interaction

Despite the long history of dislocation–phonon interaction studies, there are many problems that have not been fully resolved during this development. These include an incompatibility between a perturbative approach and the long-range nature of a dislocation, the relation between static and dynamic scattering, and their capability of dealing with thermal transport phenomena for bulk material only. Here by utilizing a fully quantized dislocation field, which we called a “dislon”, a phonon interacting with a dislocation is renormalized as a quasi-phonon, with shifted quasi-phonon energy, and accompanied by a finite quasi-phonon lifetime, which are reducible to classical results. A series of outstanding legacy issues including those above can be directly explained within this unified phonon renormalization approach. For instance, a renormalized phonon naturally resolves the decade-long debate between dynamic and static dislocation–phonon scattering approaches, as two limiting cases. In particular, at nanosca...

Authors:   Mingda Li; Zhiwei Ding; Qingping Meng; Jiawei Zhou; Yimei Zhu; Hong Liu; M. S. Dresselhaus; Gang Chen
Journal:   Nano Letters
Year:   2017
DOI:   10.1021/acs.nanolett.6b04756
Publication date:   16-Feb-2017
Facts, background information, dossiers
  • scattering
  • quantum
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