Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 79: Correlated Electrons - Poster Session

TT 79.44: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

Optical absorption of a spin-1/2 Heisenberg antiferromagnet on a triangular lattice — •Boris Celan and Wolfram Brenig — Institute for theoretical Physics, Technische Universität Braunschweig

We investigate the optical absorption in a spin-1/2 antiferromagnetic Heisenberg model on the anisotropic triangular lattice coupled to lattice degrees of freedom. We describe the scattering of light from the system via a simple model of magneto-elastic coupling to nearest neighbor bond dipoles, assuming a monoatomic unit cell. The magnetic excitations are described using linear spin wave theory including interaction to O(1/S²). The absorption cross section is evaluated in terms of two-magnon-one-phonon Greens functions. Results will be presented for the conductivity versus frequency and temperature, with and without final state interactions. The impact of anisotropy will be analyzed. The role of different phonon density of states will be considered.