Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 38: Transport: Spintronics, Magnetotransport 1 (jointly with HL&MA)

MA 38.5: Vortrag

Donnerstag, 14. März 2013, 10:30–10:45, H18

Projective Boltzmann approach to thermal drag in spin-1/2-ladder systems coupled to phonons — •Christian Bartsch and Wolfram Brenig — Institute for Theoretical Physics, Technical University Braunschweig, D-38106 Braunschweig

We quantitatively investigate the spin-phonon drag contributions to the thermal conductivity of a two-leg-spin-1/2-ladder coupled to lattice vibrations in a magnetoelastic way. By applying suitable transformations the system is mapped onto a weakly interacting quantum gas model of bosonic spin excitations (magnons) and phonons. We adequately construct a collision term of a linear(ized) Boltzmann equation from the underlying quantum dynamics by means of a pertinent projection operator technique. From the Boltzmann equation we obtain concrete numerical values for the drag conductivity and relate it to the individual thermal conductivities of magnons and phonons for parameter ranges which are typical for certain material classes.