Projects per year
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.
Original language | English |
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Article number | 075107 |
Number of pages | 13 |
Journal | Physical Review B |
Volume | 110 |
Issue number | 7 |
DOIs | |
Publication status | Published - 15 Aug 2024 |
Austrian Fields of Science 2012
- 103018 Materials physics
- 103015 Condensed matter
- 103043 Computational physics
Projects
- 1 Active
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Ab-initio calculations for anharmonic polarons in hydrides
1/10/20 → 31/01/25
Project: Research funding