It is found that the sharp resistivity peak observed near the Curie temperature TC in the manganites R1-xAxMnO3 is closely correlated to the residual resistivity ρ0 of the sample, suggesting that nonmagnetic randomness plays an important role in deter . . .

Using the four-terminal Landauer-Büttiker formula and Green’s function approach, we calculate numerically the spin-Hall conductance in a two-dimensional junction system with the Rashba spin-orbit (SO) coupling and disorder. We find that the spin-Hall . . .

A real spin-charge separation scheme is found based on a saddle-point state of the t-J model. In the one-dimensional (1D) case, such a saddle-point reproduces the correct asymptotic correlations at the strong-coupling fixed point of the model. In the . . .

The spin Hall effect in a two-dimensional electron system on honeycomb lattice with both intrinsic and Rashba spin-orbit couplings is studied numerically. Integer quantized spin Hall conductance is obtained at the zero Rashba coupling limit when elect . . .

Elementary excitations are discussed in the ffux-binding phase [Weng, Sheng, and Ting, Phys. Rev. B 49, 607 (1994)j of the t Jm-odel. It is shown that the density snd current constraints in the gauge-theory description will dramatically modify the cha . . .

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 . . .

We present a self-consistent RVB theory which unifies the metallic (superconducting) phase with the half-filling antiferromagnetic (AF) phase. Two crucial factors in this theory include the RVB condensation which controls short-range AF spin correlati . . .

A generalized slave-particle scheme is introduced to study the t-J model with nonlocal effects included. A charge-spin decoupled state is found in this scheme, in which the nonlocal gauge fields play a role of attaching fictitious quantized fluxes to . . .

In this paper we explore the incommensurate spatial modulation of spin-spin correlations as the intrinsic property of the doped Mott insulator, described by the t-J model. We show that such an incommensurability is a direct manifestation of the phase- . . .

The motion of a single hole in a Mott antiferromagnet is investigated based on the t-J model. An exact expression of the energy spectrum is obtained, in which the irreparable phase string effect [Phys. Rev. Lett. 77, 5102 (1996)] is explicitly present . . .