Physics Bldg. Room 223A, Library
The MU Physics & Astronomy Department’s Condensed Matter - Biological Physics - Electrical & Computer Engineering seminar series presents, "Growth and Physical Properties of Novel Electronic and Spintronic Materials," by Prof. Dipanjan Mazumdar, Southern Illinois University, Carbondale, Wednesday, March 21, 4:00 p.m. Refreshments will be served beginning at 3:30 p.m.
Prof. Mazumdar writes, "We are interested in the growth of new materials and investigate physical properties affected by size, chemical doping, interface, heterostructure, and external tuning parameters (light, magnetic field, etc.). My talk consists of two separate topics that have involved several graduate and undergraduate students in the past three years. First, I will discuss our work on the influence finite-size in Topological insulator Bi2Se3 thin-films. Through a combination of quantum confinement and Burstein-Moss effect, we discovered a large optical blue-shift in Bi2Se3 as it approaches the 2D limit. We also correlate this increase in bulk band gap to enhanced resistivity and low Hall mobility in films below six quintuple layers. In the second part of my talk, I will present results on a theory-driven experimental search of new half-metallic materials that can be useful in emerging spintronics technologies such as spin-transfer torque random access memory. Several new and thermodynamically-stable half-metallic materials have been identified in the inverse-Heusler family (general formula X2YZ). Synthesis of such materials is underway both in bulk and thin-film form. I shall share some recent results on Manganese-based inverse-Heuslers."