The Physics Department is seeking enthusiastic students to work as Learning Assistants during the fall, 2014 semester. Student must have comleted Mechanics (PHYS 1430), and have an interest in helping others learn physics. Students who have not been a Learning Assistant before should complete the New LA Application at
Student who have served as LA's previously should complete the Returning LA Application at
ABSTRACT: The perovskites exhibit variety of interesting material characteristics, including magnetism, ferroelectricity, and superconductivity. High quality perovskite oxides can be grown epitaxially, using molecular beam epitaxy or pulsed laser deposition to achieve artificially tailored heterostructures. Moreover, it has also been shown that epitaxial growth of the perovskite crystal can be achieved on silicon and gallium arsenide—a necessary condition for integration with current technologies. Unlike conventional semiconductors in which the effective mass is a fraction of the bare electron mass, perovskite semiconductors can have band masses up to ten times the bare electron mass. This distinction is expected to lead to strong correlation effects in perovskite two-dimensional electron systems (2DESs). Perovskite oxide 2DESs with strong spin-orbit interaction (SOI) can be valuable for spintronics. Interplay between strong correlation and SOI can play a key role for a robust control of magnetic or superconducting properties.
In this talk I will present a theory that applies directly to strong SOI induced spin splitting in 2DESs formed at t2g perovskite surfaces and heterojunctions and establishes some essential differences from SOI in conventional semiconductors. In particular we find that interaction spin-splitting magnitudes are controlled by changes in metal-oxygen-metal bond angles and by atomic spin-orbit interaction strengths. Using qualitative considerations based on a two-center approximation for tight-binding-model matrix elements, we demonstrate that Rashba spin-orbit interactions in complex-oxide two-dimensional electron gases are due primarily to changes in metal-oxygen-metal bond angles at surfaces and interfaces. We verify this conclusion by comparing our picture with illustrative ab initio electronic structure calculations.Refreshments will be served before the presentation.
Physics students Daniel Curie, Beth Leblanc, Jessica Conn, and Maclyn Compton present their work at the WISE-2013 conference.
"We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology."
Carl Sagan (1934 - 1996)
The study of Physics provides a fantastic foundation that supports lifelong learning, teaching and discovering about the natural world. National efforts aimed at increasing the role of science, technology, engineering, and mathematics (STEM) curriculum from primary through college levels will ultimately affect many aspects of America's global technology competitiveness including immigration policy, national security, and workforce development.
The Physics department here at Texas State University actively contributes to engaging students in STEM coursework through its education and research activity.