V. Dobrosavljevic
Department of Physics and National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306, USA
地点：唐仲英楼A313
时间：2017-07-31 15:00
According to early ideas of Mott and Anderson, the interaction-driven metal-insulator transition （Mott Transition）remains a sharp T=0 phase transition even in absence of any spin or charge ordering. Should this phase transition be regarded as a quantum critical point? To address this question, here we examine the phase diagram and transport properties of the maximally frustrated half-filled Hubbard model, in the framework of dynamical mean-field theory. We identify a “quantum Widom line” (QWL) which defines the center of the corresponding quantum critical region associated with Mott metal-insulator transition in this model. The evolution of resistivity with temperature is then evaluated along trajectories following (parallel to) the QWL, displaying remarkable scaling behavior characteristic of quantum criticality. Precisely this kind of behavior was found in very recent experiments on organic Mott systems. In the case of the doping-driven Mott transition, we show that the mysterious “Bad Metal” behavior (T-linear resistivity around the Mott-Ioffe-Regel limit) coincides with the quantum critical region of the Mott transition.
Prof. Dobrosavljevic obtained his B.Sc. at the University of Belgrade in 1983, after which he moved to the US, where he earned his M.Sc. (1985) and his Ph.D. ta Brown University (1988). He carried postdoctoral research at the University of Maryland (1989-1991) and Rutgers University (1991-1995). He joined the Faculty at the Department of Physics at Florida State University (FSU), where he is currently a Professor of Physics, since 2006. He is also serving as the Director of the Condensed Matter Sciences – Theory program at the National High Magnetic Field Laboratory at FSU (2006-present). Prof. Dobrosavljevic is an expert in theories of stronglycorrelated electronic systems with and without disorder, and is primarily interested in understanding the fundamental nature of the Metal-Insulator Quantum Phase Transition.