Theory for Magnetic-Field-Driven 3D Metal-Insulator Transitions in the Quantum Limit

Insulator–metal transitions in Pr0.7Ca0.3MnO3 induced by a magnetic field

Disorder- and correlation-driven metal-insulator transitions

Metal-insulator transitions driven by disorder (∆) and/or by electron correlations (U) are investigated within the Anderson-Hubbard model with local binary-alloy disorder using a simple but consistent mean-field approach. The ∆–U phase diagram is derived and discussed for T = 0 and finite temperatures.

Quantum critical “opalescence” around metal-insulator transitions

Divergent carrier-density fluctuations equivalent to the critical opalescence of gas-liquid transition emerge around a metal-insulator critical point at a finite temperature. In contrast to the gas-liquid transitions, however, the critical temperature can be lowered to zero, which offers a challenging quantum phase transition. We present a microscopic description of such quantum critical phenom...

Magnetic and metal-insulator transitions in coupled spin-fermion systems

R. Mondaini,1,2 T. Paiva,3 and R. T. Scalettar2 1Physics Department, The Pennsylvania State University, 104 Davey Laboratory, University Park, Pennsylvania 16802, USA 2Physics Department, University of California, Davis, California 95616, USA 3Instituto de Fı́sica, Universidade Federal do Rio de Janeiro Cx.P. 68.528, 21941-972 Rio de Janeiro RJ, Brazil (Received 14 August 2014; published 14 Octo...

Dynamical mean-field studies of metal–insulator transitions

How a substance evolves from a metallic to a non-metallic state is one of the most fundamental and richest problems in condensed matter physics. In general, there are several mechanisms at play. Electron–electron interactions can drive a metal to insulator transition in a pure substance (Mott 1990). This transition is named after Sir Nevill Mott who laid down the foundations for the physical un...