Optical signatures of exciton-polarons from diagrammatic Monte Carlo

Abstract

We study the interplay of electron-electron and electron-phonon interactions in the course of electron-hole bound state formation for gapped solid state systems. Adapting the essentially approximation-free diagrammatic Monte Carlo method for the calculation of the optical response, we discuss the absorption of light in correlated electron-phonon systems for the whole interaction and phonon frequency regimes. The spectral function obtained by analytical continuation from the imaginary-time current-current correlation function demonstrates the dressing of excitons by a phonon cloud when the coupling the lattice degrees of freedom becomes increasingly important, where notable differences show up between the adiabatic and anti-adiabatic cases.

6 pages, 5 figures

References in corpus (6)

• Exciton Binding Energy of Monolayer WS2
• Measurement of high exciton binding energy in the monolayer transition-metal dichalcogenides WS2 and WSe2
• Two-dimensional Hubbard-Holstein bipolaron
• Numerical analytic continuation: Answers to well-posed questions
• Fate of the excitonic insulator in the presence of phonons
• Exact treatment of exciton-polaron formation by Diagrammatic Monte Carlo

Cited by in corpus (4)

• Diagrammatic quantum Monte Carlo toward the calculation of transport properties in disordered semiconductors
• Generalized method of Feynman-Pines diagram technique in the theory of energy spectrum of two-level quasiparticle renormalized due to multi-phonon processes at cryogenic temperature
• Fingerprints of preformed pairs in two-electron angle-resolved photoemission spectroscopy
• Bound excited states of Fröhlich polarons in one dimension