Time: Tuesday 10:00 a.m. 10th February
Place: A622,SINANO
Academic Report：Interface superconductivity: a route to room temperature superconductor
Speaker：Dr. Fangsen Li
Abstract: Since 50 years ago, interface-enhanced superconducting was proposed to be a route to room temperature superconductor. A most recent successful example comes from dramatically increased superconducting gap Δ (~ 20 meV) and transition temperature Tc (higher than 50 K) in films of single unit-cell (UC) iron selenide (FeSe) grown on SrTiO3(001) substrate(Chin. Phys. Lett. 29, 037402 (2012)). Charge transfer (Nat. Mater. 12, 605 (2013)), interfacial enhance electron?phonon coupling (Nature 515, 245 (2014)) and interface ferroelectric transition (Phys. Rev. Lett. 114, 037002 (2015)) are suggested to play important role in the enhancement of Tc. Understanding such a substantial interface enhancement, which may provides a clue of how to further increase Tc and resolve the mechanism for high-temperature superconductor.
In this talk I will first review some efforts to room temperature superconductor, and then share our most recent results about the huge enhancement of Tc in single UC FeSe by introducing special interface.
Biography: Dr. Fangsen Li is a Postdoctoral Fellow in the Department of Physics at Tsinghua University since 2012. Dr. Li received his B.S. Degree in 2006, and Ph. D. degree in 2011 from the School of Materials Science and Engineering in Northwestern Polytechnical University, Xi'an, China. In 2008-2010, He visited the Nanoscale Physics Research Laboratory (NPRL) of the University of Birmingham in UK as a joint doctoral student. His research interests focus on the MEB growth, in situ STM/STS and electron transport characterization of low-dimensional quantum materials with novel properties, especially two-dimensional superconductors, topological insulators. Dr. Li has published more than 20 highly cited scientific papers in Nat. Commun., Proc. Natl. Acad. Sci. U.S.A., J. Am. Chem. Soc., J. Phys. Chem. C, Langmuir, Phys. Rev. B, etc.
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