146 citations · 381 across the 6 of their papers we have counts for
6 papers
Optical bounds on many-electron localization
Ivo Souza, Richard M. Martin, Massimiliano Stengel
We establish rigorous inequalities between different electronic properties linked to optical sum rules, and organize them into weak and strong bounds on three characteristic proper…
Correlation effects in quasi one dimensional electron wires
L. Shulenburger, M. Casula, G. Senatore +1
We explore the role of electron correlation in quasi one dimensional quantum wires as the range of the interaction potential is changed and their thickness is varied by performing…
Exchange-Correlation Hole in Polarized Insulators: Implications for the Microscopic Functional Theory of Dielectrics
Gerardo Ortiz, Ivo Souza, Richard M. Martin
We present a simple and direct proof that the exchange-correlation hole, and therefore the exchange-correlation energy, in a polarized insulator is not determined by the bulk densi…
Mott-Hubbard insulators for systems with orbital degeneracy
Olle Gunnarsson, Erik Koch, Richard M. Martin
We study how the electron hopping reduces the Mott-Hubbard band gap in the limit of a large Coulomb interaction U and as a function of the orbital degeneracy N. The results support…
Important role of alkali atoms in A4C60
O. Gunnarsson, S. C. Erwin, E. Koch +1
We show that hopping via the alkali atoms plays an important role for the t1u band of A4C60 (A=K, Rb), in strong contrast to A3C60. Thus the t1u band is broadened by more than 40 %…
Mott Transition in Degenerate Hubbard Models: Application to Doped Fullerenes
Olle Gunnarsson, Erik Koch, Richard M. Martin
The Mott-Hubbard transition is studied for a Hubbard model with orbital degeneracy N, using a diffusion Monte-Carlo method. Based on general arguments, we conjecture that the Mott-…