Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 17: PhD Symposium: Quantum Magnets: Frustration and Topology in Experiment and Theory (jointly with Young DPG (jDPG)
MA 17.5: Vortrag
Dienstag, 21. März 2017, 12:30–12:45, HSZ 04
Thermal and spin transport properties of frustrated spin-1/2 chains in high magnetic fields — •Jan Stolpp1, Christoph Karrasch2, Shang-Shun Zhang3, Cristian Batista3, and Fabian Heidrich-Meisner1 — 1Arnold Sommerfeld Center for Theoretical Physics - Ludwig-Maximilians-Universität München — 2Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin — 3Department of Physics, University of Tennessee, Knoxville, and Oak Ridge National Laboratory
We perform a full diagonalization study of frustrated spin-1/2 chains (i.e. spin-1/2 chains with nearest and next nearest neighbor interaction) in the presence of an external magnetic field. The thermal and spin conductivity are computed from Kubo formulae as a function of frustration and field strength. We are especially interested in the transport properties in the vector chiral phase that appears in the phase diagram at strong frustration and in a high field. We observe an enhanced low-frequency response in the high-field vector chiral phase which we trace back to a renormalization and enhancement of the characteristic velocity.