Topological or not? ARPES reveals topologically non-trivial electronic structure in single crystals of the ferrimagnetic-TI candidate Mn(1+x)Sb(2-x)Te4.
ORAL
Abstract
The combination of nontrivial band topology with magnetism results in a wide variety of exotic electronic phases that - if realized at high temperatures - could revolutionize fields like spintronics or low-power consumption electronics. The new, second-generation ferrimagnetic (fM) compound Mn1+xSb2-xTe4 (0.1 ≤ x ≤ 1, abbreviated here as MST) promises to host the quantum anomalous Hall effect (QAHE) and other topological phases at higher temperatures than any of its predecessors, with TC up to 73K. The long-range magnetic order of these MST single crystals is confirmed, therefore the big question is “are they topologically non-trivial?”. I present temperature-dependent ARPES measurements that clearly argue that the answer is “yes”. Aditionally, I will discuss further temperature dependent features in the banstructure that could suggest the potential importance of electron-magnon coupling in understanding the ARPES data.
*Institute of Physics, University of Amsterdam
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Publication: Submitted paper (Chemistry of Materials): Mn Interstitials in Layered Mn1+xSb2−2/3xTe4: Structural Modification and Curie Temperature Boost.
Planned paper: Temperature-dependent electronic structure of the intrinsically ferrimagnetic topological insulator MnSb2Te4.
Presenters
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Sergio B Pierantoni
- University of Amsterdam