The coexistence of π-flux state and d-wave RVB state is considered in this paper within the slave boson approach. A critical value of doping concentration δc is found, below which the coexisting π-flux and d-wave RVB state is favored in energy. The pseudo Fermi surface of spinons and the physical electron spectral function are calculated. A clear Fermi-level crossing is found along the (0,0) to...

Takada et al. have reported superconductivity in layered NaxCoO2.yH2O (Tc ≈ 5 K) and more recently Wen et al. in AxCoO2+δ (A = Na, K)(Tc ≈ 31 K). We model a reference neutral CoO2 layer as an orbitally non-degenerate spin1 2 antiferromagnetic Mott insulator on a triangular lattice and NaxCoO2.yH2O and AxCoO2+δ as electron doped Mott insulators described by a tJ model. It is suggested that at op...

An exotic fractionalized Fermi-liquid FL$^*$ theory of metallic systems, which combines resonant-valence-bond (RVB) state and the band current carriers, is treated. application this to spin-liquid, antiferromagnetic nearly systems proposed with use various bosonic fermionic representations, a comparison perturbation in $s-d(f)$ exchange model being performed. The topological aspects including f...

Resonating valence bond (RVB) liquids in two dimensions are believed to exhibit topological order and to admit no local order parameter of any kind. This is a defining property of ”liquids” but it has been explicitly confirmed only in a few exactly solvable models. In this paper, we investigate the quantum dimer model on the triangular lattice. It possesses an RVB-type liquid phase, however, fo...

BACKGROUND Lately, more and more preparation of various cocktails or mixtures of bioactive modulators have been introduced. Their true activity is, however, rarely tested. AIM To compare six commercially available, glucan-based immunostimulators. METHODS Immunological effects of tested combinations were measured by evaluation of phagocytosis of synthetic particles by peripheral blood neutro...

Background. Lately, more and more preparation of various cocktails or mixtures of bioactive modulators have been introduced. Their true activity is, however, rarely tested. Aim. To compare six commercially available, glucan-based immunostimulators. Methods. Immunological effects of tested combinations were measured by evaluation of phagocytosis of synthetic particles by peripheral blood neutrop...

We study the competition between non-magnetic (dimer or flux) states and short-range antiferromagnetically ordered RVB states in the t-J model and present a finite temperature phase diagram. We show that, for a wide range of temperatures and dopings, the stable phase results to be a state in which both the flux and the RVB parameters are nonzero. PACS: 71.27, 74.20. In this paper we want to ext...

As a revolutionary observation tool in life science, biomedical, and material optical microscopy allows imaging of samples with high spatial resolution wide field view. However, conventional methods are limited to single cannot accomplish real-time image processing. The edge detection, enhancement phase visualization schemes have attracted great interest the rapid development analog computing. ...