Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 49: Topolectric Circuits and Quantum Hall Systems

TT 49.7: Vortrag

Mittwoch, 18. März 2020, 18:45–19:00, HSZ 103

Thermal Hall effect in a Bulk Quantum Hall System EuMnBi2 — •Mohammad Pakdaman1, Jan Bruin1, Claus Muehle1, Xinglu Que1, Yosuke Matsumoto1, and Hidenori Takagi1,2,31Max Planck Institute for Solid State Research, Stuttgart, Germany — 2Department of Physics, University of Tokyo, Japan — 3c Institute for Functional Matter and Quantum Technologies, University of Stuttgart, Germany

The recent observation of a quantum Hall effect in EuMnBi2 is attracting a lot of attention since it is a rare example of quantum Hall physics in a bulk material. Here, the largely suppressed coupling between 2D electron layers is a key. Moreover, the 2D electrons are understood to have a Dirac dispersion, which may help explain their low carrier density and high mobility. In this study, diagonal and nondiagonal thermal conductivity of EuMnBi2 were measured down to 90 mK up to the field range of 14 T. We report a strong thermal Hall effect and a field dependent thermal conductivity that carries signatures of both electronic and magnetic origins. Possible origin and signatures of quantization will be discussed in the talk.

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