Dresden 2017 – wissenschaftliches Programm
MA 53.2: Hauptvortrag
Donnerstag, 23. März 2017, 15:30–16:00, HSZ 01
Thermal Hall Effect of Spin Excitations in Quantum Magnets — •Max Hirschberger1, Robin Chisnell2, Jason W. Krizan3, Young S. Lee2, Robert J. Cava3, and N. Phuan Ong1 — 1Department of Physics, Princeton University, USA — 2Department of Physics, Massachusetts Institute of Technology, USA — 3Department of Chemistry, Princeton University, USA
In magnetic materials without delocalized electrons, the thermal Hall effect κxy is a sensitive tool to explore the topological properties of low-energy magnetic (spin) excitations in a magnetic field. For magnetically ordered systems, κxy is a direct probe of the Berry curvature of the quasiparticle bands. We will illustrate this point using our experimental results for the 2D layered Kagome ferromagnet Cu(1,3bdc). Moreover, we will discuss our measurements of a large κxy on the frustrated pyrochlore quantum spin ice Tb2Ti2O7, and its close relative Yb2Ti2O7. Finally, we highlight the absence (to our resolution) of a thermal Hall signal in many other frustrated magnetic systems we have studied recently.