Dresden 2020 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 65: Poster Session Topological Topics
TT 65.23: Poster
Donnerstag, 19. März 2020, 15:00–19:00, P2/EG
Transport and scanning tunneling microscopy study on EuMnBi2 — •Xinglu Que1, Jan Bruin1, Mohammad Pakdaman1, Claus Mühle1, Jürgen Nuss1, Qingyu He1, Lihui Zhou1, and Hidenori Takagi1,2,3 — 1Max Planck Institute for Solid State Research, Stuttgart, Germany — 2Institute for Functional Matter and Quantum Technologies, University of Stuttgart, Germany — 3Department of Physics, University of Tokyo, Japan
The quantum Hall effect (QHE) has been a compelling topic in physics in which the interplay of correlation and topology plays a key role. Though it is usually exclusive to two-dimensional electron systems, multilayered form of QHE has been reported in 3D materials with the layered pnictide EuMnBi2 being a notable example. In this system antiferromagnetically ordered Eu ions decouple the Bi square net layers which host Dirac fermions, exhibiting rich magnetic textures. By controlling the magnetic phase distinct electronic structures are accessible.
We report our investigation on EuMnBi2 utilizing transport measurement and scanning tunneling microscope (STM). Quantized Hall signals in both electrical and thermal conductance are clearly observed, with charge and entropy carriers characterized by Wiedemann-Franz law in this QHE system. STM results reveal atomically resolved surface after low temperature cleavage, and local spectroscopy finds features derived from Bi which is in good agreement with band structure calculations.