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Variational ground state of a two-orbital Hubbard model
- Source :
-
Journal of Physics & Chemistry of Solids . Aug/Sep2005, Vol. 66 Issue 8/9, p1384-1387. 4p. - Publication Year :
- 2005
-
Abstract
- Abstract: An optimization variational Monte Carlo method is formulated for a two-dimensional Hubbard model with doubly degenerate atomic orbitals. We use generalized Gutzwiller-type wave functions, which include all the possible intra-atomic correlations. As a demonstration, we show results of energy and some correlation functions for a special case; at a quarter filling and for large Coulomb interactions, a ferromagnetic state with an orbital order overcomes paramagnetic and superconducting states. However, this ferromagnetism is destabilized by electron doping or by introducing a diagonal transfer in one direction, both of which work as substantial frustrations. [Copyright &y& Elsevier]
- Subjects :
- *MONTE Carlo method
*NUMERICAL analysis
*MATHEMATICAL models
*STOCHASTIC processes
Subjects
Details
- Language :
- English
- ISSN :
- 00223697
- Volume :
- 66
- Issue :
- 8/9
- Database :
- Academic Search Index
- Journal :
- Journal of Physics & Chemistry of Solids
- Publication Type :
- Academic Journal
- Accession number :
- 18307005
- Full Text :
- https://doi.org/10.1016/j.jpcs.2005.05.014