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The State Key Lab of
High Performance Ceramics and Superfine Microstructure
Shanghai Institute of Ceramics, Chinese Academy of Sciences
中 国 科 学 院 上 海 硅 酸 盐 研 究 所 高 性 能 陶 瓷 和 超 微 结 构 国 家 重 点 实 验 室
Ferroelectricity at the Nanoscale
Speaker
Prof. Xiaoxing Xi
Department of Physics, Department of Materials Science and Engineering, and Materials Research Institute,
The Pennsylvania State University, University Park, Pennsylvania
时间： 6 月 3 日 （星期三）上午 10:00
地点： 14 号楼 1号会议室
联系人：顾辉 研究员
Abstract：
Ferroelectricity at the nanoscale has emerged as fertile ground for new physical phenomena and devices. The advance in oxide thin film technology has allowed growth of nanoscale oxide ultrathin films and heterostructures with extremely high structural quality. As an example, I will present the results on nanoscale BaTiO3/SrTiO3 superlattices and ultrathin BaTiO3 films. In bulk, BaTiO3 is ferroelectric below 403 K and SrTiO3 is quantum paraelectric. Using ultraviolet Raman spectroscopy we showed that one-unit-cell-thick BaTiO3 layers in BaTiO3/SrTiO3 superlattices are not only ferroelectric (with Tc as high as 250 kelvin) but also polarize the quantum paraelectric SrTiO3 layers adjacent to them. Tc was tuned by ~500 kelvin by varying the thicknesses of the BaTiO3 and SrTiO3 layers, revealing the essential roles of electrical and mechanical boundary conditions for nanoscale ferroelectricity.
Education
1/1987 Ph.D., Physics, Peking University and Institute of Physics, Chinese Academy of Science
Thesis Title: “Ion beam mixing at liquid helium temperature and superconductivity in disordered AlSi alloys”
Thesis Advisor: Professor Wei-Yan Guan
4/1982 B.S., Physics, Peking University
Experience
7/2004 - present: Professor, Department of Physics and Department of Materials Science and Engineering, Penn State University
12/2001 - present: Member, Materials Research Institute, Penn State University
8/2002 - 7/2003: Visiting Professor, Department of Applied Physics, Stanford University
8/2002 - 7/2003: Visiting Member of Technical Staff, Conductus/Superconductor Technologies, Inc.
12/2001 - 6/2004: Associate Professor, Department of Materials Science and Engineering, Penn State University
7/2001 - 6/2004: Associate Professor, Department of Physics, Penn State University
8/1995 - 6/2001 Assistant Professor, Department of Physics, Pennsylvania State University
2/1995 - 7/1995 Member Technical Staff, Superconducting Core Technologies, Inc
8/1993 - 12/1994 Research Scientist, National Institute of Standard and Technology
12/1990 - 2/1995 Research Scientist, University of Maryland.
6/1989 - 12/1990 Research Associate, Bellcore and Rutgers University
4/1987 - 5/1989 Visiting Scientist, Karlsruhe Nuclear Research Center
Honors and Awards
· Fellow, American Physical Society, 2007.
· Chang Jiang Scholar Visiting Professor at Tsinghua University, Chinese Ministry of Education and Li Ka Shing Foundation (2006-2009).
· Oversees Well-Known Scholar, Chinese Academy of Sciences, in the International Team on Superconductivity and Novel Electronic System, Institute of Physics (2005-2008).
· Italian National Research Council (CNR) visiting scholar award (2006).
· Guest Professor, Peking University (2005).
· Career Award, National Science Foundation, June 1997.
· Kong-Cheng Wang Award, Chinese Academy of Science, June 1997.
Guest Professor, Center for Modern Physics, Department of Physics, Peking University (1993-).
