Shedding Light on the Enigma of High Temperature Superconductivity in Monolayer FeSe / SrTiO3

Who: Dr. Kyle Shen, Cornell University
Monday, March 1, 2021 - 4:00pm

Quantum materials host a vast array of emergent electronic phenomena, including high-temperature superconductivity, topological properties, and nanoscale charge / spin ordering. One of the challenges is to be able to precisely and deterministically manipulate their properties. To achieve this control, we employ molecular beam epitaxy (MBE) to synthesize artificial quantum materials with atomic layer precision, combined with angle-resolved photoemission spectroscopy (ARPES) which provides direct insights into the electronic structure. In particular, I will focus on the enhanced high-temperature superconductivity in monolayer FeSe grown on SrTiO3 substrates, where superconductivity has previously been reported to exceed 60 K, nearly one order of magnitude higher than that of bulk FeSe (Tc = 8K). This dramatic enhancement remains the largest amongst known superconductors, positioning monolayer FeSe / SrTiO3 as an ideal platform for investigating fundamental questions about interfacial superconductivity. n particular, the combination of its high Tc and inherently two-dimensional (2D) nature makes FeSe / SrTiO3 suited for exploring the interplay between 2D phase fluctuations and the interfacial enhancement of superconductivity, a better understanding of which could enable the future design and engineering of artificial higher- Tc superconductors.

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