Berlin 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 19: Frustrated Magnets - Spin Liquids - Theory

TT 19.1: Vortrag

Montag, 12. März 2018, 15:00–15:15, H 3010

Thermal transport of the Kitaev spin ladder in a magnetic field — •Alexandros Metavitsiadis and Wolfram Brenig — Institute for Theoretical Physics, Technical University Braunschweig, Braunschweig, Germany

The Kitaev spin ladder (KSL) is a minimum quasi one-dimensional (1D) representative of the celebrated two-dimensional Kitaev model on the Honeycomb lattice. The frustration caused by the compass interactions leads to fractionalization which combined with the spatial confinement of 1D leads to localization in the absence of disorder and consequently to vanishing dc transport coefficients. Furthermore, the KSL exhibits an interesting phase diagram with gapless, as well as trivial and topological gapped phases. In this work, we present results for the thermodynamical as well as for the thermal transport properties of the Kitaev spin ladder in the presence of a magnetic field, which gives rise to finite dc transport coefficients. We provide results at finite temperatures for a wide range of the magnetic field’s strength, from the insulating to the diffusive regime, and for different sets of Kitaev couplings, starting from gapless or gapful phases in KSL’s phase diagram. We primarily rely on numerical techniques, namely exact diagonalization and the quantum typicality but we also provide comparison with an effective fermionic model, valid for weak magnetic fields.