Dr. Fu-Jiun Jiang (Institute of Theoretical Physics, University of Bern)

Systematic Effective Field Theory Investigation of Lightly Hole-Doped

Abstract:
Motivated by the baryon chiral perturbation theory for QCD, using the symmetries as well as other relevant properties of the underlying microscopic t-J model, we have constructed a low-energy effective field theory for the t-J model on the square and honeycomb lattices. The effective field theory is universal and can make model-independent predictions for the entire class of antiferromagnetic cuprates. For example, We have used the resulting effective Lagrangian to investigate the possible spiral phases in the lightly hole-doped antiferromagnets. Our results can be verified in experiments. The principles behind this construction are simple but general, and can be extended to other lattice geometries including the frustrated lattices which are relevant to the real materials. Such extension, in particular the possible applications of the nested cluster algorithm which is a promising solution to the sign problem arising in the frustrated systems, will be discussed as well.

2009 年 3 月 06 日
14:30~15:30

RM 111, New Physics Building