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TT: Fachverband Tiefe Temperaturen

TT 11: Spintronics, Spincalorics and Magnetotransport

TT 11.2: Vortrag

Montag, 27. März 2023, 15:15–15:30, HSZ 304

Thermal transport in weakly coupled spin-1/2 Heisenberg ladders — •Anja Wenger, Christian Northe, and Ewelina Hankiewicz — Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany

We investigate the weakly coupled spin-1/2 Heisenberg ladder in the low energy limit. As magnetic excitations significantly contribute to the thermal transport, we expose the ladder to a magnetic field and analyze the thermal conductivity and the specific heat capacity depending on the magnetization. Starting point is the spin-1/2 Heisenberg chain and its fermionic and bosonic description by conformal field theory. From coupling two spin chains and applying the (rescaled) bosonisation technique, a free theory for spin-ladders and its spectrum is obtained. Special interest lies on the conformal anomaly and the Tomonaga-Luttinger Liquid parameters. Introducing temperature to the theory gives access to the thermal transport properties.