Quantum phenomena are the underlying mechanism behind most of what we see and do during our day-to-day life. However, in most materials, quantum effects are obscured already at length-scales as small as the distance between two to five atoms within the substance, roughly one nanometer. Advances in emerging material systems during the last decade lead to novel types of materials, which are as thin as only one or a few atoms so that the entire material is only a surface or an ‘open’ interface. Systems of this kind, such as graphene and topological insulators, demonstrate quantum states that are protected and therefore are preserved over distances that are significantly larger than the length scale relevant to quantum phenomena in other materials. Our lab will utilize molecular beam epitaxy (MBE) to fabricate clean quantum interface materials and hybridize these interfaces with clean functional materials. To examine the sought quantum phenomena at the interface/surface, scanning tunneling microscopy (STM), angle-resolved photoemission spectroscopy (ARPES),Physical Property Measurement System (PPMS), 3He-4He Dilution Refrigerator and Neutron Scatterings will be involved in our labs.
03/2018 Fei’s paper, Chromium-Induced Ferromagnetism with Perpendicular Anisotropy in Topological Crystalline Insulator SnTe (111) Ultra-Thin Films, is published on PRB. Congrats!
02/2018 Dr. Morteza Kayyalha from Purdue University joins our group as a postdoc, Welcome!
01/2018 Di’s paper, Realization of the Axion Insulator State in Quantum Anomalous Hall Sandwich Heterostructures, is published on PRL (Editors’ suggestion). Congrats!
11/2017 Mingda’s paper, Dirac-electron-mediated magnetic proximity effect in topological insulator/magnetic insulator heterostructures, is published on PRB (Rapid Communication). Congrats!
06/2017 Jia Yu from Peking University joins our group as a REU student, Welcome!
06/2017 Yifan Zhao from Penn State University joins our group as a graduate student, Welcome!
03/2017 Fei Wang from Institute of Metal Research, Chinese Academy of Sciences (IMR,CAS) joins our group as a visiting student, Welcome!
03/2017 Prof. Chang is awarded 2017 International Union of Pure and Applied Physics (IUPAP) Young Scientist Prize in the Structure and Dynamics of Condensed Matter (C10) “For the discovery of quantum anomalous Hall effect in magnetically doped 3D topological insulator films”! See MIT news and IUPAP news for more details.
02/2017 Dr. Chang joins The Penn State University. Chang Research Group is founded at Penn State.