Dynamic properties of a polaron coupled to dispersive optical phonons

Bonča, J.; Trugman, S. A.

doi:10.1103/physrevb.103.054304

Title: Dynamic properties of a polaron coupled to dispersive optical phonons

Journal Article · Fri Feb 12 00:00:00 EST 2021 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.103.054304· OSTI ID:1856155

Bonča, J. ^[1];

^[2]

J. Stefan Inst., Ljubljana (Slovenia); Univ. of Ljubljana (Slovenia)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We study static and dynamic properties of an electron coupled to dispersive quantum optical phonons in the framework of the Holstein model defined on a one-dimensional lattice. Calculations are performed using the Lanczos algorithm based on a highly efficient construction of the variational Hilbert space. Even small phonon dispersion has a profound effect on the low-energy optical response. While the upward phonon dispersion broadens the optical spectra due to single-phonon excitations, the downward dispersion has the opposite effect. With increasing dispersion, a multiphonon excitation (MPE) state becomes the lowest excited state of the system at zero momentum and determines the low-frequency response of the optical conductivity where the threshold for optical absorption moves below the single-phonon frequency. Multiphonon states form a well-defined bandlike feature just above the polaron band as clearly seen in the electron spectral function. Low-energy MPEs should be observable in systems with strong optical phonon dispersion in optical as well as angle-resolved photoemission experiments.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1856155

Report Number(s):: LA-UR-20-30004; TRN: US2305080

Journal Information:: Physical Review. B, Vol. 103, Issue 5; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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