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arXiv · 2611.00548

Elucidating the topological nature of molecular beam epitaxy grown high Curie temperature (Mn1+ySb2-yTe4)x(Sb2-yMnyTe3)1-x using angle resolved photoelectron spectroscopy

Candice R. Forrester·Jisoo Moon·Sina Mohammadi·Asish Kundu·Amy Lopez Navarro·Kaushini Wickramasinghe·Abhay Pasupathy·Anil K. Rajapitamahuni·Maya N. Nair·Elio Vescovo·Lia Krusin-Elbaum·Maria C. Tamargo
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Abstract

Angle-resolved photoemission spectroscopy (ARPES) is used to elucidate the band structure of (Mn1+ySb2-yTe4)x(Sb2-yMnyTe3)1-x, a new magnetic quantum material grown using molecular beam epitaxy that has a Curie temperature (TC) above 100K, much higher than those reported for other materials of the MnxSb2-xTe4 class. Conflicting and sparse theory and experiments, as well as the complex disordered structure of the materials make it difficult to establish their topological nature. Here we explore this question by performing ARPES studies for two samples with x=0.65 and x=0.92, respectively. Images of the band structures of these two samples were acquired using photon energy dependent studies. The bulk and surface states of this complex material system, and the effects of composition on the band structure were investigated. Evidence of surface state features as well as bulk related ones were obtained, supporting their non-trivial nature. No signature of Fermi-arcs consistent with Weyl semimetals were seen. A shift in the Fermi level of the two samples due to different carrier densities allowed observation of the onset of a Dirac point in the surface states. Temperature dependent ARPES suggests possible band splitting as the materials undergo magnetic transitions, helping to understand the magnetic interactions. Our results point to their likely magnetic topological insulating nature.

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Candice R. Forrester, Jisoo Moon, Sina Mohammadi, Asish Kundu, Amy Lopez Navarro, Kaushini Wickramasinghe, Abhay Pasupathy, Anil K. Rajapitamahuni, Maya N. Nair, Elio Vescovo, Lia Krusin-Elbaum, Maria C. Tamargo. 2026-10-31. Elucidating the topological nature of molecular beam epitaxy grown high Curie temperature (Mn1+ySb2-yTe4)x(Sb2-yMnyTe3)1-x using angle resolved photoelectron spectroscopy. https://arxiv.org/abs/2611.00548

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