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6 papers · 2 filters
Holes as Dipoles in a Doped Antiferromagnet and Stripe Instabilities
Su-Peng Kou, Zheng-Yu Weng
Based on an effective model of a doped antiferromagnetic Mott insulator, we show that a doped hole will induce a dipole-like spin configuration in a spin ordered phase at low dopin…
Schwinger-Boson Mean-Field Theory of Mixed-Spin Antiferromagnet
Yun Song, Shiping Feng
The Schwinger-boson mean-field theory is used to study the three-dimensional antiferromagnetic ordering and excitations in compounds , a large family of quasi-one-dimen…
Convergence of energy-dependent incommensurate antiferromagnetic neutron scattering peaks to commensurate resonance in underdoped bilayer cuprates
Shiping Feng, Feng Yuan, Zhao-Bin Su +1
The recently discovered coexistence of incommensurate antiferromagnetic neutron scattering peaks and commensurate resonance in underdoped YBaCuO is calling for an e…
Topological Gauge Structure and Phase Diagram for Weakly Doped Antiferromagnets
Su-Peng Kou, Zheng-Yu Weng
We show that the topological gauge structure in the phase string theory of the {\rm t-J} model gives rise to a global phase diagram of antiferromagnetic (AF) and superconducting (S…
Effect of the additional second neighbor hopping on the charge dynamics in the t-J model
Feng Yuan, Shiping Feng
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…
Optical and transport properties in doped two-leg ladder antiferromagnet
Jihong Qin, Yun Song, Shiping Feng +1
Within the t-J model, the optical and transport properties of the doped two-leg ladder antiferromagnet are studied based on the fermion-spin theory. It is shown that the optical an…