Electron Doped

1. Dynamical Mean Field Theory Studies of the Mott Transition Marcello Civelli Olivier Parcollet, and Gabriel Kotliar Rutgers University, NSF DMR-0096462 The Mott transition, namely how the electron evolves from being wave-like and conducting to being particle-like and insulating as a function of a control parameter such as pressure (denoted by U/W in fig 1) is a central problem in materials theory. It is relevant to materials as diverse as kappa organics, and vanadium oxides. A new method, cellular dynamical mean field theory (CDMFT) developed thru NSF support, revealed that as the critical Mott endpoint is approached the distribution of spectral intensity acquires a d wave anisotropy PRL, 92, 226402. (2004)) .. DMFT Schematic phase diagram of a material undergoing a pressure driven Mott transition. Science 302, 67 (2003) Evolution of the distribution of low energy spectral intensity as the Mott transition is approached. (left curve fermi liquid), right curve within 5 % of the Mott endpoint.

2. The phenomena of the breakup of the Fermi surface and differentiaton in momentum space is generic to the approach to the Mott transition. Spectral Function A(k,ω→0)= -1/π G(k, ω→0) vs k . Theory , (bottom row Civelli et. al. to appear in Phys. Rev. Lett. 2005) and experiments (top row K. Shen et. al. Science (2004) and P. Armitage et. al. PRL (2001)) in doped cuprate high temperature superconductors . The transition is now doping ( denoted by x) driven. . Electron Doped Hole Doped