Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 31: Correlated Electrons: Metal Insulator Transition - Part 2

TT 31.17: Vortrag

Donnerstag, 30. März 2006, 18:15–18:30, HSZ 301

Transport properties of polaronic systems at finite temperature — •Alexander Weiße¹, Andreas Alvermann¹, Gerald Schubert¹, Gerhard Wellein², and Holger Fehske¹ — ¹Theoretische Physik II, Universität Greifswald, 17487 Greifswald — ²RRZ Erlangen, Universität Erlangen, 91058 Erlangen

We review recent developments of Chebyshev expansion based algorithms for the calculation of dynamical correlation functions and apply these techniques to the one-dimensional Holstein model. Focussing on the case of finite temperatures, we present exact numerical results for the optical response in this prototypical model for electron-lattice interaction. In addition, we analyze deviations from the standard small polaron theory in the intermediate coupling regime and discuss non-adiabaticity effects in detail. [Phys. Rev. B 72, 104304 (2005)]