5 papers
Comment on Tuning of the CDW in MX Chains
J. Tinka Gammel
In M. Alouani et al., Phys. Rev. Lett. 71, 1415 (1993), the authors performed local-density-approximation (LDA) calculations and fit to the two-band model [J.T. Gammel et al., Phys…
Infinite Volume Extrapolations of Finite Cluster Calculations, ---How Correct are These?
S. Mazumdar, F. Guo, D. Guo +2
Extrapolations of numerical data obtained from finite cluster calculations to the infinite volume limit can often give incorrect results. We discuss four separate cases: (a) the in…
A Non-Standard Quark Model and the Mass Difference
J. Tinka Gammel, John L. Gammel
We show that a highly unconventional theory, based on the 16 dimensional (,) irreducible representation of O(4), fits the masses of the baryons ,,$Σ…
Electron-Phonon Driven Spin Frustration in Multi-Band Hubbard Models: MX Chains and Oxide Superconductors
J. Tinka Gammel, K. Yonemitsu A. Saxena, A. R. Bishop +1
We discuss the consequences of both electron-phonon and electron-electron couplings in 1D and 2D multi-band (Peierls-Hubbard) models. After briefly discussing various analytic limi…
Relaxed Excited State Geometries in a Peierls-Hubbard Model for Polyenes
J. Tinka Gammel, D. K. Campbell
Using parameter values relevant to polyacetylene and its finite polyene analogs, we determine, via exact finite size diagonalization of a 1D Peierls-Hubbard model, the relaxed geom…