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• W2068864785 startingPage "14092" @default.
• W2068864785 abstract "The spectral weight functions and the optical conductivity of the Holstein model are studied on a one-dimensional six-site lattice with periodic boundary conditions for three different electron concentrations: a single electron, two electrons of opposite spins, and half filling. A density matrix approach is used to obtain an optimal phonon basis and to truncate the phonon Hilbert space without significant loss of accuracy. This approach allows us to calculate spectral functions for electrons dressed locally by the optimal phonons as well as for bare electrons. We obtain evidence for a smooth crossover from quasifree electrons to a heavy itinerant small polaron (single-electron case) or bipolaron (two-electron case) as the electron-phonon coupling strength increases. At half filling, we observe a crossover from a quasifree-electron ground state to a quasidegenerate Peierls charge-density-wave ground state for a finite electron-phonon coupling. This crossover is marked by an abrupt drop of the Drude weight, which is vanishingly small in the Peierls phase." @default.
• W2068864785 created "2016-06-24" @default.
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• W2068864785 date "1999-11-15" @default.
• W2068864785 modified "2023-10-15" @default.
• W2068864785 title "Dynamical properties of the one-dimensional Holstein model" @default.
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• W2068864785 doi "https://doi.org/10.1103/physrevb.60.14092" @default.
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