• Research
  • Condensed Matter Physics

In a surprising new discovery, alpha-tin, commonly called gray tin, exhibits a novel electronic phase when its crystal structure is strained, putting it in a rare new class of 3D materials called topological Dirac semimetals (TDSs). Only two other TDS materials are known to exist, discovered as recently as 2013. Alpha-tin now joins this class as its only simple-element member.

This discovery holds promise for novel physics and many potential applications in technology. The findings are the work of Caizhi Xu, a physics graduate student at the University of Illinois at Urbana-Champaign, working under U. of I. Professor Tai-Chang Chiang and in collaboration with scientists at the Advanced Light Source at the Lawrence Berkeley National Laboratory and six other institutions internationally.

  • Accolades
  • Condensed Matter Physics

Emeritus and Research Professor Tai-Chang Chiang of the University of Illinois at Urbana-Champaign has been elected by the Academia Sinica to its 2016 class of Academicians. He is among 22 scholars across all academic disciplines to receive this high honor this year. Academia Sinica is the national academy of Taiwan. Former Academicians in the mathematics and physics division include Nobel laureates T.D. Lee, C.N. Yang, Sam Ting, and Daniel Tsui.

Over the course of his career, Chiang has made lasting contributions to condensed matter physics, surface science, and synchrotron radiation research, including several truly groundbreaking findings. He has authored about 300 journal articles, and his work has been cited more than 8,500 times.