Experimentalphysik VI

Abstract We present a temperature-dependent infrared spectroscopy study on the layered topological semimetal Nb3SiTe6 combined with density-functional theory calculations of the electronic band structure and optical conductivity. Our results reveal an anisotropic behavior of the in-plane (ac-plane) optical conductivity, with three pronounced excitations located at around 0.15, 0.28, and 0.41 eV for the polarization of the incident radiation along the c axis.

Abstract Interplay between magnetism and electronic band topology is of central current interest in topological matter research. We use quantum oscillations as a powerful tool to probe the evolution of band topology in the Dirac semimetal EuMnSb2. The Eu local 4f magnetic moments display different antiferromagnetic states below 25 K and a field-polarized phase above 16 T.

Research Article Kan Zhao1,*,†, Hao Deng2,*, Hua Chen3,*, Kate A. Ross3, Vaclav Petříček4, Gerrit Günther5, Margarita Russina5, Vladimir Hutanu2, Philipp Gegenwart1,† 1Experimentalphysik VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany. 2Institute of Crystallography, RWTH Aachen University and Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), D-85747 Garching, Germany.