Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2010-08-19
Phys. Rev. B 82, 104304 (2010)
Physics
Condensed Matter
Other Condensed Matter
10 pages, 8 figures
Scientific paper
10.1103/PhysRevB.82.104304
We investigate the low-energy properties of the Holstein polaron through calculation of the q-dependent phonon spectral function using an improved exact-diagonalization technique, defined over a variational Hilbert space. We perform a comprehensive study of the low-energy excitations of the polaron. Beside the energy range, where the additional phonon excitation is unbound, we observe separate coherent peaks which correspond to bound and antibound states of a polaron and additional phonon quanta. These novel states can be observed for intermediate and strong electron-phonon coupling strengths, as well as below and above the unbound one-phonon excitation spectrum. A detailed investigation of their properties is presented. We find good agreement between the phonon spectral function obtained from the first-order strong-coupling perturbation theory and numerical results.
Bonča Janez
Trugman Stuart A.
Vidmar Lev
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