报告题目:Studies on novel quantum properties in 2D materials
报告人：姜达
报告时间：2021年7月2日（周五）上午10：00
报告地点：浙江工业大学理学楼A110
Abstract:
The surprising discovery of graphene, the thinnest material considered not possible to be prepared before, opened a new era where rich physics and significant potential applications are being explored. A series of graphene-like two-dimensional (2D) materials have been heavily studied recently, including boron nitride, MoS2, NbSe2, WS2, etc.
2D superconductors have a rich history in mesoscopic physics. As the film dimensions are reduced, many intriguing phenomena arise such as quantum confinement, quantum fluctuations, superconductor-insulator transition, etc., which may bring deep insight into the fundamentals of superconductivity. The surface and interface effects of 2D superconductors are expected to search for exotic quantum states, unveil the puzzling issue of unconventional superconducting mechanism, and explore for new prototype superconducting devices.
Professor Da Jiang’s lecture will present his recent three research progresses in 2D materials. (1) The investigation of the superconductivity in Bi2Sr2CaCu2O8+x (Bi2212) with half-unit cell thick. This is the first demonstration of high-Tc superconductivity preserved in Bi2212 down to half unit-cell thick. Meanwhile, it was found that graphene/2D Bi2212 heterostructure exhibited non-linear I-V characteristics, which provided the possibility for developing new superconducting devices. (2) The investigation of the edge superconductivity in 2D Fe1+ySexTe1-x (FST) by transport measurements and scanning-SQUID. The 1D superconductivity around the edge of FST have been observed, which provides strong evidence for the topological superconductivity nature of FST. (3) The investigation of the FFLO state, predicted by four theorists more than 50 years ago. In the past half century, there has been no undisputed experimental verification of the exotic FFLO superconducting state. Professor Da Jiang’s team has been successfully observed the FFLO state at the interface of 2D NbSe2/CrCl3 heterostructures. This finding sheds light on an opportunity to search for more novel quantum states and quantum devices.
Lecturer: Professor Da Jiang (Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences)
Da Jiang, the "Hundred Talents Program" professor of Chinese Academy of Sciences, hold the bachelor's degree from Department of Physics of Nanjing University in 2000, and the PhD degree from School of Physics and Astronomy of The University of Manchester in 2006 under the supervision of Professor Andre Geim, the Nobel Laureate in physics in 2010. Professor Jiang has been long engaged in the research of two-dimensional quantum materials and devices, and has published more than 30 papers in SCI journals, such as Science, Nature and its sub-journals, Physical Review Letters, PNAS, Nano Letters, which have been cited for more than 84,000 times.
邀请人：林强