报告题目：Emergent Phenomena in Ferroelectric/van der Waals Heterostructures
报 告 人：洪霞教授，美国内布拉斯加大学林肯分校。
时 间：2023年09月26日(周二)10:30
地 点：安徽大学磬苑校区材料科学大楼A101报告厅
主办单位：材料科学与工程学部
报告摘要：The heterointerfaces between ferroelectrics and two-dimensional (2D) van der Waals materials present a versatile platform for achieving novel interfacial coupling, nonvolatile field effect control, and nanoscale programmable functionalities. In this talk, I will discuss a range of emergent phenomena in ferroelectric/vdW heterostructures mediated by interfacial coupling of charge, lattice, and polar symmetry. By combining polarization doping with nanoscale domain patterning in a ferroelectric polymer P(VDF-TrFE) top-gate, we create directional conducting paths in an insulating 2D channel, which reveals highly anisotropic conductivity in monolayer (1L) to 4-layer 1T’-ReS2 between the directions along and perpendicular to the Re-chain. The interface-epitaxy between P(VDF-TrFE) and ReS2 leads to large scale P(VDF-TrFE) thin films composed of highly ordered, close-packed, 10 and 35 nm wide crystalline nanowires. We observe enhanced polar alignment, piezoelectricity, and Curie temperature in thin CuInP2S6 (CIPS) flakes prepared on ferroelectric oxide PbZr0.2Ti0.8O3 (PZT), which can be attributed to the interfacial strain imposed by PZT. An unconventional filtering effect of second harmonic generation (SHG) signal is enabled by the polar coupling of 1L MoS2 with either the polar domain or the chiral dipole rotation at the domain wall surface in PZT thin films or free-standing membranes. Our study showcases the rich research opportunities offered by integrating ferroelectrics with 2D materials.
洪霞简介：Xia Hong is a Professor in the Department of Physics and Astronomy at the University of Nebraska-Lincoln (UNL). She received her B.S. degree from Peking University and Ph.D. from Yale University. After working as a postdoctoral scholar at the Pennsylvania State University, she joined the faculty of UNL in 2011 as an Assistant Professor. She received the NSF Career Award in 2012 and the DOE Early Career Award in 2016. Her research focuses on the nanofabrication, magnetotransport and scanning probe studies of novel two-dimensional electron systems and complex oxide nanostructures and interfaces.
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