On the nature of the optical conductivity of polaron

Abstract

We study theoretically a fundamental issue in solids: the evolution of the optical spectra of polaron as the electron-phonon coupling increases. By comparing the exact results obtained by diagrammatic Monte Carlo method and the data got through exact diagonalization within an appropriate subspace of the phononic wavefunctions, the physical nature of the crossover from weak to strong coupling is revealed. The optical spectra are well understood by the quantum mechanical superposition of states with light and heavy phonon clouds corresponding to large and small polarons, respectively. It is also found that the strong coupling Franck-Condon regime is not accessible at realistic values of the coupling constant.

4 pages

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Cited by in corpus (21)

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• Finite-temperature density-matrix renormalization group method for electron-phonon systems: Thermodynamics and Holstein-polaron spectral functions
• Crossover from Super- to Sub-Diffusive Motion and Memory Effects in Crystalline Organic Semiconductors
• Coexistence of excited polarons and metastable delocalized states in photo-induced metals
• Numerically Exact Generalized Green's Function Cluster Expansions for Electron-Phonon Problems
• Lecture notes on Diagrammatic Monte Carlo for the Fröhlich polaron
• Optical signatures of exciton-polarons from diagrammatic Monte Carlo
• Electron-phonon coupling in undoped cuprate $YB{a}_{2}C{u}_3{O}_6$ estimated from Raman and optical conductivity spectra
• Dissipative dynamics of a driven qubit: interplay between non-adiabatic dynamics and noise effects from weak to strong coupling regime
• Beyond the Born-Markov approximation: dissipative dynamics of a single qubit
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• Optical conductivity of a strong-coupling polaron
• Renormalized energy of ground and first excited state of Fröhlich polaron in the range of weak coupling
• Polarons with arbitrary nonlinear electron-phonon interaction
• Energy spectrum of localized quasiparticles renormalized by multi-phonon processes at finite temperature
• 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
• Dynamical response of ultracold interacting fermion-boson mixtures
• Renormalized spectrum of quasiparticle in limited number of states, strongly interacting with two-mode polarization phonons at $T=0$ K