Degrees at Peking University: B.Sc. (1984), M.Sc. (1987), PhD (1993) Postdoctoral fellows: Royal Institute of Technology (KTH), Sweden (1995-1997), University of Surrey, UK (1997-2000) Professorship at Peking University: Associate professor (1994-1999), professor (2000-) Head of Department of Technical Physics, Peking University: 2001-2015