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cond-mat1998
Supersymmetry in models with strong on-site Coulomb repulsion - application to t-J model
T. K. Ng, Chi-Ho Cheng
A supersymmetric way of imposing the constraint of no double occupancy in models with strong on-site Coulomb repulsion is presented in this paper. In this formulation the physical…
cond-mat1997
Functional Integral approach to quasi-particles in Fermi Liquid theory
Tai-Kai Ng
In this paper we propose a new way of organizing many-body perturbation theory in the Path-integral formulation where a set of quasi-particle wave-functionals 's are introduced…
cond-mat1996
Non-magnetic impurities in S=1/2 spin-Peierls system and Heisenberg ladder systems
Tai-Kai Ng
In this paper we study the effect of non-magnetic impurities in spin-Peierls system within the framework of non-linear sigma model plus topological term. We show that loc…