Coexistence of Superconductivity and Antiferromagnetism in Topological Magnet MnBi2Te4 Films

Abstract

The interface of two materials can harbor unexpected emergent phenomena. One example is interface-induced superconductivity. In this work, we employ molecular beam epitaxy to grow a series of heterostructures formed by stacking together two non-superconducting antiferromagnetic materials, an intrinsic antiferromagnetic topological insulator MnBi2Te4 and an antiferromagnetic iron chalcogenide FeTe. Our electrical transport measurements reveal interface-induced superconductivity in these heterostructures. By performing scanning tunneling microscopy and spectroscopy measurements, we observe a proximity-induced superconducting gap on the top surface of the MnBi2Te4 layer, confirming the interaction between superconductivity and antiferromagnetism in the MnBi2Te4 layer. Our findings will advance the fundamental inquiries into the topological superconducting phase in hybrid devices and provide a promising platform for the exploration of chiral Majorana physics in MnBi2Te4-based heterostructures.

arXiv comment24 pages, 4 figures, comments are welcome

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• Intrinsic magnetic topological insulators of the MnBi${}_2$Te${}_4$ family
• Stoichiometric FeTe is a Superconductor
• Mystery of superconductivity in FeTe films and the role of neighboring layers
• Higher-order epitaxy: A pathway to suppressing structural instability and emergent superconductivity
• Optimizing proximitized magnetic topological insulator nanoribbons for Majorana bound states
• Vertex correction for the linear and nonlinear optical responses in superconductors: multiband effect and topological superconductivity
• Meissner Effect and Nonreciprocal Charge Transport in Non-Topological 1T-CrTe2/FeTe Heterostructures
• Moire Engineering of Cooper-Pair Density Modulation States