COLLOQUIUM 2022
Shedding Light on the Interfacial Enhancement of Superconductivity in Monolayer FeSe / SrTiO3
| Speaker | Kyle M. Shen, Department of Physics, Cornell University, Ithaca NY 14853 |
| Host | Anjan Soumyanarayanan |
| Date | Thu, 24 Feb @ 11 AM – 12 PM |
| Zoom registration link | https://nus-sg.zoom.us/webinar/register/WN_1IfYHlqCQPiLUbxlESOSYQ |
Abstract
Quantum materials host a vast array of emergent 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. Here, we describe how we can dramatically enhance superconductivity in a single monolayer of FeSe through interfacial interactions with a substrate, SrTiO3. To achieve this enhancement, we employ a combination of molecular beam epitaxy (MBE) and angle-resolved photoemission spectroscopy (ARPES) which provides direct insights into the electronic structure and quantum many-body interactions. The dramatic enhancement of superconductivity in a single monolayer of FeSe / SrTiO3 remains the largest amongst known superconductors, positioning this system as an ideal platform for investigating fundamental questions about interfacial superconductivity.
Biography
Kyle Shen is the James A. Weeks Professor of Physical Sciences, and the Director of the Laboratory of Atomic and Solid State Physics at Cornell University. He received his Ph.D. in Applied Physics from Stanford University, and a B.S. in Physics and a B.S. in Electrical Engineering from M.I.T. His interests include investigating many-body interactions in quantum materials, with the aim of controlling potentially exotic properties such as superconductivity, magnetism, metal-insulator transitions, and topological properties through a combination of spectroscopies, molecular beam epitaxy, and synchrotron-based x-ray probes.