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Title: Predicting charge transport in the presence of polarons: The beyond-quasiparticle regime in SrTiO 3

Journal Article · · Physical Review Research
 [1];  [2]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States). Dept. of Applied Physics and Materials Science; Caltech
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States). Dept. of Applied Physics and Materials Science

In materials with strong electron-phonon (e–ph) interactions, the electrons carry a phonon cloud during their motion, forming quasiparticles known as polarons. Predicting charge transport and its temperature dependence in the polaron regime remains an open challenge. Here, we present first-principles calculations of charge transport in a prototypical material with large polarons, SrTiO3. Using a cumulant diagram-resummation technique that can capture the strong e–ph interactions, our calculations can accurately predict the experimental electron mobility in SrTiO3 between 150–300 K. They further reveal that for increasing temperature the charge transport mechanism transitions from bandlike conduction, in which the scattering of renormalized quasiparticles is dominant, to a beyond-quasiparticle transport regime governed by incoherent contributions due to the interactions between the electrons and their phonon cloud. Our work reveals long-sought microscopic details of charge transport in SrTiO3, and provides a broadly applicable method for predicting charge transport in materials with strong e–ph interactions and polarons.

Research Organization:
California Institute of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0004993
OSTI ID:
1576515
Alternate ID(s):
OSTI ID: 1576674
Journal Information:
Physical Review Research, Journal Name: Physical Review Research Journal Issue: 3 Vol. 1; ISSN PPRHAI; ISSN 2643-1564
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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