5 papers
Suppression of superfluid density in the superfluid-supersolid transition
Tai Kai Ng
We show that the rather unexpected pressure dependence of superfluid density observed near the superfluid-supersolid transition by Kim {\em et.al.}[M.H.W. Chan, {\em private commun…
Quantum coherence and Kondo effect in multi quantum dot systems
Xi Dai, T. K. Ng
The quantum interference effect among coupled identical quantum dots is studied in the present paper in the limit of strong intra-dot Coulomb interaction. When the average electron…
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…
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…
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…