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O: Fachverband Oberflächenphysik
O 103: Topology and Symmetry Protected Materials I
O 103.2: Vortrag
Donnerstag, 19. März 2020, 10:45–11:00, WIL A317
Electronic and magnetic structure of the intrinsic magnetic topological insulator system (Bi2Te3)n(MnBi2Te4) (n=0,1) — •Thiago R. F. Peixoto1,5, Raphael C. Vidal1,5, Alexander Zeugner2,5, Simon Moser3,5, Michael Ruck2,5, Bernd Büchner4,5, Anna Isaeva4,5, Hendrik Bentmann1,5, and Friedrich Reinert1,5 — 1Exp. Phys. VII, Universität Würzburg — 2Faculty of Chemistry and Food Chemistry, TU Dresden — 3Exp. Phys. IV, Universität Würzburg — 4Leibniz IFW Dresden and Faculty of Physics, TU Dresden — 5Würzburg-Dresden Cluster of Excellence ct.qmat
Recently, MnBi2Te4 has been established as the first antiferromagnetic (AFM) topological insulator [1,2], and represents the n=0 member of the layered series (Bi2Te3)n(MnBi2Te4). For n=1, we confirm a non-stoichiometric composition proximate to MnBi4Te7, and featuring an AFM state below 13 K, followed by a state with net out-of-plane magnetization below 5 K [3].
Here we present the spectroscopic signatures of these magnetic topological phases by means of angle-resolved photoemission (ARPES) and X-ray magnetic linear and circular dichroism (XMLD/XMCD) experiments on MnBi2Te4 and MnBi4Te7 single crystals. Both compounds reveal topologically non-trivial Dirac surface states on the (0001) surface, providing a versatile platform for the realization of magnetic topological states of matter.
[1] M. M. Otrokov et al., ArXiv:1809.07389 (2019).
[2] R. C. Vidal et al., Phys. Rev. B 100, 121104(R) (2019).
[3] R. C. Vidal et al., ArXiv:1906.08394 (2019).