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TT: Fachverband Tiefe Temperaturen
TT 23: Topological Insulators and Weyl Semimetals (joint session MA/TT)
TT 23.6: Talk
Tuesday, March 19, 2024, 10:45–11:00, H 2013
Surface reconstruction effects in thin films of Antiferromagnetic Topological Insulator MnBi2Te4 — •Shahid Sattar and Carlo Maria Canali — Department of Physics and Electrical Engineering, Linnaeus University, Kalmar SE-39231, Sweden
Intrinsic magnetic topological insulator MnBi2Te4 (MBT) characterized by a non-zero topological Z2 index has recently gained significant interest and attention. Experiments on thin films of MBT have confirmed the presence of the anomalous quantum Hall and axion insulating phases in odd and even septuple-layer films respectively. In this work, we investigate surface reconstruction effects on topological characteristics in thin films of MBT using first-principles calculations and an effective k· p model Hamiltonian. We discuss the implications of surface reconstruction on both the Chern and axion insulating phases and discuss the presence of Rashba surface states for the latter. Our results provide a theoretical framework needed to elucidate the nature of surface reconstruction in magnetic TI thin films, which can be useful for their experimental realization.
Keywords: Magnetic Topological Insulator; Surface Reconstruction; MnBi2Te4