Analytic method for quadratic polarons in nonparabolic bands

Autor(en)

S. N. Klimin, J. Tempere, M. Houtput, S. Ragni, T. Hahn, C. Franchini, A. S. Mishchenko

Abstrakt

Including the effect of lattice anharmonicity on electron-phonon interactions has recently garnered attention due to its role as a necessary and significant component in explaining various phenomena, including superconductivity, optical response, and temperature dependence of mobility. This study focuses on analytically treating the effects of anharmonic electron-phonon coupling on the polaron self-energy, combined with numerical Diagrammatic Monte Carlo (DiagMC) data. Specifically, we incorporate a quadratic interaction into the method of squeezed phonon states, which has proven effective for analytically calculating the polaron parameters. Additionally, we extend this method to nonparabolic finite-width conduction bands while maintaining the periodic translation symmetry of the system. Our results are compared with those obtained from Diagrammatic Monte Carlo, partially reported in a recent study [S. Ragni, Phys. Rev. B 107, L121109 (2023)2469-995010.1103/PhysRevB.107.L121109], covering a wide range of coupling strengths for the nonlinear interaction. Remarkably, our analytic method predicts the same features as the Diagrammatic Monte Carlo simulation.

Organisation(en)

Computergestützte Materialphysik

Externe Organisation(en)

University of Antwerp, Harvard University, Università di Bologna, RIKEN, INSTITUT ZA FIZIKU, Flatiron Institute

Journal

Physical Review B

Band

110

Anzahl der Seiten

13

ISSN

2469-9950

DOI

https://doi.org/10.48550/arXiv.2403.18019

Publikationsdatum

08-2024

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik, 103015 Kondensierte Materie, 103043 Computational Physics

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/56ab983a-7e57-4b0e-b1be-bff824ae5fe4