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ArticleWeng, Z.Y.We propose a theory for a doped antiferromagnet based on the bosonic resonatingvalencebond (RVB) description incorporating the phase string effect. Both antiferromagnetic and superconducting phase transitions occur naturally inside such a bosonic RV . . .

ArticleWeng, Z.Y.A real spincharge separation scheme is found based on a saddlepoint state of the tJ model. In the onedimensional (1D) case, such a saddlepoint reproduces the correct asymptotic correlations at the strongcoupling fixed point of the model. In the . . .

ArticleWeng, Z.Y.Delocalization problem for a twodimensional noninteracting electron system under a random magnetic field is studied. The Chern number is used to characterize the extended states in such a system, and by studying finitesize scaling of the density of . . .

ArticleKruger, F.We study the S=1 square lattice Heisenberg antiferromagnet with spatially anisotropic nearestneighbor couplings J1x and J1y frustrated by a nextnearestneighbor coupling J2 numerically using the densitymatrix renormalizationgroup DMRG method and a . . .

ArticleWeng, Z.Y.Elementary excitations are discussed in the ffuxbinding phase [Weng, Sheng, and Ting, Phys. Rev. B 49, 607 (1994)j of the t Jmodel. It is shown that the density snd current constraints in the gaugetheory description will dramatically modify the cha . . .

ArticleTing, C.S.We reexamine the problem of a hole moving in an antiferromagnetic spin background and find that the injected hole will always pick up a sequence of nontrivial phases from the spin degrees of freedom. Previously unnoticed, such a stringlike phase origi . . .

ArticleSheng, DonnaWe present a selfconsistent RVB theory which unifies the metallic (superconducting) phase with the halffilling antiferromagnetic (AF) phase. Two crucial factors in this theory include the RVB condensation which controls shortrange AF spin correlati . . .

ArticleSheng, DonnaWe present the first numerical studies of the disorder effect on the recently proposed intrinsic spinHall conductance in a three dimensional lattice Luttinger model. The results show that the spinHall conductance remains finite in a wide range of di . . .

ArticleSheng, DonnaBased on exact diagonalization and density matrix renormalization group method, we show that an anisotropic triangular lattice Heisenberg spin model has three distinct quantum phases. In particular, a spinliquid phase is present in the weak interchai . . .

ArticleWeng, Z.Y.A generalized slaveparticle scheme is introduced to study the tJ model with nonlocal effects included. A chargespin decoupled state is found in this scheme, in which the nonlocal gauge fields play a role of attaching fictitious quantized fluxes to . . .
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