October 24, Nandini Trivedi, Ohio State University

nandini3:00 PM in Room 205, 8 St. Mary’s Street

Refreshments served at 2:45 PM

Interplay of Spin-Orbit Coupling and Coulomb Correlations in Transition Metal Oxides

Abstract: Quantum materials today can be classified as a function of the strength of Coulomb interactions U and spin orbit coupling λ, in units of the bandwidth W. At large U lie the 3d transition metal oxides that show phenomena such as colossal magneto-resistance and high Tc superconductivity. In the opposite quadrant we encounter topological band insulators with large λ but in weakly correlated s- and p- band materials. I will discuss the next frontier of 4d and 5d oxide materials in the central region of such a phase diagram and show how novel phases and phenomena arise from the close interplay of all three scales– λ, U and W. I will critically review the combination of computational methods that are necessary to address the richness of the 4d and 5d materials. The role of advanced spectroscopies such as angle resolved photoemission, inelastic neutron scattering, THz spectroscopy, and resonant x-ray scattering using circularly polarized photons, to identify different response functions of complex oxides will also be discussed.

Biography: Nandini Trivedi got her undergraduate degree from the Indian Institute of Technology, Delhi and a Ph.D in physics in 1987 from Cornell University. After post-doctoral research at University of Illinois at Urbana-Champaign and State University of New York, Stony Brook, she joined Argonne National Laboratory as a staff scientist. In 1995 she joined the faculty of the Tata Institute of Fundamental Research, Mumbai. Since 2004 she has been a professor of physics at the Ohio State University. Her research interests include strong correlations, disorder and Monte Carlo simulations of quantum materials and ultra-cold atomic gases.

 

Faculty Host: David Campbell

Student Host: Margaret Chen