Analytic method for quadratic polarons in nonparabolic bands
- Author(s)
- S. N. Klimin, J. Tempere, M. Houtput, S. Ragni, T. Hahn, C. Franchini, A. S. Mishchenko
- Abstract
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(s)
- Computational Materials Physics
- External organisation(s)
- University of Antwerp, Harvard University, University of Bologna, Ulmer Fundamental Symmetries Laboratory, INSTITUT ZA FIZIKU, Flatiron Institute
- Journal
- Physical Review B
- Volume
- 110
- No. of pages
- 13
- ISSN
- 2469-9950
- DOI
- https://doi.org/10.48550/arXiv.2403.18019
- Publication date
- 08-2024
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103018 Materials physics, 103015 Condensed matter, 103043 Computational physics
- ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials, Condensed Matter Physics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/56ab983a-7e57-4b0e-b1be-bff824ae5fe4