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We report three surprising results regarding the nature of the spatial broken symmetries in the two-dimensional ͑2D͒, quarter-filled band with strong electron-electron interactions that provides a microscopic model of the 2:1 cationic organic charge-transfer solids ͑CTS's͒. First, in direct contradiction to the predictions of one-electron theory, we find a(More)
We present a study of the effects of simultaneous charge and spin frustration on the two-dimensional strongly correlated quarter-filled band on an anisotropic triangular lattice. Our conclusions are based on exact diagonalization studies that include electron-electron interactions as well as adiabatic electron-phonon coupling terms treated(More)
We examine two recently proposed models of charge ordering ͑CO͒ in the nominally 1 4-filled, quasi-one-dimensional ͑1D͒ organic charge-transfer solids ͑CTS͒. The two models are characterized by site charge density ''cartoons''. .. respectively. We use the Peierls-extended Hubbard model to incorporate both electron-electron (e-e) and electron-phonon (e-ph)(More)
We report exact calculations of magnetic and superconducting pair-pair correlations for the half-filled band Hubbard model on an anisotropic triangular lattice. Our results for the magnetic phases are similar to those obtained with other techniques. The superconducting pair-pair correlations at distances beyond nearest neighbor decrease monotonically with(More)
The Suburban Birmingham project aimed to allow the exploration of a collection of resources originally presented through a website on a touch table. In this paper we will explore some of the issues illustrated by this project involving the manipulation and sharing of resources on multiuser applications in public spaces, including ownership, affordances, and(More)
Previous work has demonstrated the existence of soliton defect states with charges +/-e/2 in the limits of zero and infinite on-site Coulomb interactions in the one-dimensional (1D) quarter-filled band. For large but finite on-site Coulomb interaction, the low temperature 2kF bond distortion that occurs within the 4kF bond-distorted phase is accompanied by(More)
This installment of the Book Review department features two full reviews: one on an "Introduction to Computational Science: Modeling and Simulation for the Sciences" by A.B. Shiflet and G.W. Shiflet ("A System Dynamics Approach to Teaching Computational Science"), and the other on "Computer Algebra Recipes: An Advanced Guide to Scientific Modeling" by R.(More)
A natural explanation for the carrier concentration-dependent electronic behavior in the layered cobaltates emerges within correlated-electron Hamiltonians with finite on-site and significant nearest neighbor hole-hole Coulomb repulsions. The nearest neighbor repulsion decreases hole double occupancy below hole density 1/3, but increases the same at higher(More)
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