Magic Doping and Robust Superconductivity in Monolayer FeSe on Titanates
Abstract
The enhanced superconductivity in monolayer FeSe on titanates opens a fascinating pathway toward the rational design of high‐temperature superconductors. Utilizing the state‐of‐the‐art oxide plus chalcogenide molecular beam epitaxy systems in situ connected to a synchrotron angle‐resolved photoemission spectroscope, epitaxial LaTiO3 layers with varied atomic thicknesses are inserted between monolayer FeSe and SrTiO3, for systematic modulation of interfacial chemical potential. With the dramatic increase of electron accumulation at the LaTiO3/SrTiO3 surface, providing a substantial surge of work function mismatch across the FeSe/oxide interface, the charge transfer and the superconducting gap in the monolayer FeSe are found to remain markedly robust. This unexpected finding indicate the existence of an intrinsically anchored “magic” doping within the monolayer FeSe systems.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 14, 2021
- Source ID
- 10.1002/advs.202003454
Entities
People
- Donghui Lu
- Dung‐hai Lee
- Makoto Hashimoto
- R. G. Moore
- Slavko N. Rebec
- Tao Jia
- Thomas P Devereaux
- Zhi‐xun Shen
- Zhuoyu Chen
Organizations
- Lawrence Berkeley National Laboratory
- Oak Ridge National Laboratory
- Office of Basic Energy Sciences
- Office of Science
- SLAC National Accelerator Laboratory
- Stanford University
- United States Department of Energy
- University of California, Berkeley