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- Shiping Feng
- 2002

The effect of the additional second neighbor hopping t on the charge dynamics of the t-J model in the underdoped regime is studied within the fermion-spin theory. The conductivity spectrum of the t-t-J model shows the low-energy peak and unusual midinfrared band, while the resistivity exhibits a nearly temperature linear dependence with deviation at low… (More)

- Shiping Feng
- 2002

The Schwinger-boson mean-field theory is used to study the threedimensional antiferromagnetic ordering and excitations in compounds L2BaNiO5, a large family of quasi-one-dimensional mixed-spin antiferromagnet. To investigate magnetic properties of these compounds, we introduce a three-dimensional mixed-spin antiferromagnetic Heisenberg model based on… (More)

- Feng Yuan, Shiping Feng, Lu Yu
- 2001

The doping, temperature and energy dependence of the dynamical spin structure factors of the underdoped lanthanum cuprates in the normal state is studied within the t-J model using the fermion-spin transformation technique. Incommensurate peaks are found at [(1±δ)π, π], [π, (1±δ)π] at relatively low temperatures with δ linearly increasing with doping at the… (More)

- Shiping Feng, Bin Liu, Ying Liang
- 2004

Within the charge-spin separation fermion-spin theory, the mechanism of superconductivity in NaxCoO2 ·yH2O is studied. It is shown that dressed fermions interact occurring directly through the kinetic energy by exchanging magnetic excitations. This interaction leads to a net attractive force between dressed fermions(then the electron Cooper pairs), and… (More)

- Shiping Feng, Huaiming Guo
- 2006

Within the kinetic energy driven superconducting mechanism, we study the interplay between superconductivity and the nodal and antinodal superconducting quasiparticle coherences in cuprate superconductors, and find the s-wave superconducting transition temperature is heavily suppressed by the antinodal superconducting quasiparticle coherence, while the… (More)

- Shiping Feng, J. B. Wu, Z. B. Su
- 1993

The electron momentum distribution function in the t − J model is studied in the framework of slave particle approach. Within the decoupling scheme used in the gauge field and related theories, we treat formally phase and amplitude fluctuations as well as constraints without further approximations. Our result indicates that the electron Fermi surface… (More)

- Weiqiang Yu, Shiping Feng
- 1999

Within the t-J model, we study the electronic properties of the doped antiferromagnet on the kagomé lattice based on the framework of the self-consistent mean-field theory. At the half-filling, the spin-liquid ground-state energy per site of the kagomé antiferromagnet is Eg/NsJ = −0.859, which is in very good agreement with the numerical estimates. Away… (More)

- Shiping Feng, Huaiming Guo, Yu Lan, Li Cheng
- 2008

In this paper, we review the low energy electronic structure of the kinetic energy driven d-wave cuprate superconductors. We give a general description of the chargespin separation fermion-spin theory, where the constrained electron is decoupled as the gauge invariant dressed holon and spin. In particular, we show that under the decoupling scheme, the… (More)

- Shiping Feng, Yun Song
- 1997

A mean-field theory which satisfying the electron on-site local constraint in the relevant regime of density for the high temperature superconductors is developed. electron density of states of copper oxide materials are discussed, and the results are qualitative consistent with the numerical simulations.

Using the fermion-spin transformation to implement spin-charge separation of constrained electrons, a model of two t − J chains with interchain single-electron hopping is studied by abelian bosonization. After spin-charge decoupling the charge dynamics can be trivially solved, while the spin dynamics is determined by a strongcoupling fixed point where the… (More)