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Final Defense: Mengke Liu
Friday, July 08, 2022, 08:00am

Mengke Liu, UT-Austin

"Superconductivity, Correlation, and Topology in Atomic-thin Quantum Materials"

Abstract: Atomic-thin quantum materials that host exotic quantum phases such as unconventional superconductivity, correlated insulating, and quantum anomalous Hall insulating states have become research frontiers due to their intriguing physical phenomena and potential applications that may revolutionize contemporary human life. Atomic-thin quantum materials reduce the dimensionality into two, which leads to many unique properties such as reduced interlayer coupling, weakened Coulomb screening, and increased phase fluctuations in the order parameters. Thank to the advancement of material engineering techniques, synthesis or separation of atomic thin quantum materials has become possible and popular. My thesis focuses on designing, controlling, and characterizing atomic-thin quantum materials using molecular beam epitaxy, scanning tunneling microscopy, and double-coil mutual inductance system. In this talk, I will cover three topics in three atomic-thin material systems. I will use intrinsic magnetic topological insulator MnBi2Te4 as a platform to discuss the interplay of the Dirac surface states with magnetism [https://arxiv.org/abs/2205.09195]. I will also discuss the manifestation of strong electron correlation and how it leads to magnetic insulating states in the charge density wave phase of 1T-NbSe2 [https://www.science.org/doi/10.1126/sciadv.abi6339]. Finally, I will briefly mention how the geometric morphology of a monolayer indium thin-film affects its superconductivity transition temperature and superfluid density [https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.127.127003]. 
Location: Zoom