Exploring 2D magnetic topological materials by density functional theory

DIPC Seminars

Speaker: Gustav Bihlmayer, Forschungszentrum Jülich, Germany
When: 2019/06/06
14:00
Place: Donostia International Physics Center
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Exploring 2D magnetic topological materials by density functional theory

Topological insulators (TIs) are fascinating materials due to their protected edge-states and their possibilities for spintronic applications. While magnetism is usually detrimental to the topological properties, we show that exchange interactions in two-dimensional (2D) topological materials offer the possibility to realize a variety of new phases depending on the structural symmetry and the direction of the magnetic (exchange) field. Using density functional theory we explore the quantum spin Hall to quantum anomalous Hall state transition in TIs and topological crystalline insulators. We propose the existence of new states like the mixed nodal-line semimetals or the mixed Weyl semimetals in the phase diagram of these 2D materials, showing interesting magnetoelectric coupling phenomena as function of the magnetization direction. Host: Andres Arnau