2 papers
cond-mat.supr-con1998
The possibility of two-exciton pairing in singlet and in triplet states
Fajian Shi
We propose a two-dimensional exciton model showing the possibility of two-exciton pairing in cuprates, both in singlet and in triplet states. The former is assumed to be responsibl…
cond-mat1996
Nagaoka State and Degeneracy in the U=infinity Hubbard Model
V. Subrahmanyam, Fajian Shi
The U=infinity Hubbard model on a hypercubic lattice with exactly one hole is studied. It is seen that a degeneracy can occur in the maximal-spin sector. It is proved variationally…