12 papers
The effects of the symmetric and antisymmetric anisotropies on the dynamics of the spin-1/2 XY chain
O. Derzhko, T. Verkholyak, T. Krokhmalskii +1
The dynamic properties of the spin-1/2 anisotropic XY chain with the Dzyaloshinskii-Moriya (DM) interaction in a transverse field are investigated. Using the Jordan-Wigner transfor…
Ground state and excitation of an asymmetric spin ladder model
Shu Chen, H. Büttner, J. Voit
We perform a systematic investigation of an asymmetric zig-zag spin ladder with inter-leg exchange and different exchange integrals on both legs. In the weak limi…
Exact ground state of the generalized three-dimensional Shastry-Sutherland model
Shu Chen, H. Büttner
We generalize the Shastry-Sutherland model to three dimensions. By representing the model as a sum of the semidefinite positive projection operators, we exactly prove that the mode…
Phase diagram of an asymmetric spin ladder
Shu Chen, H. Buettner, J. Voit
We investigate an asymmetric zig-zag spin ladder with different exchange integrals on both legs using bosonization and renormalization group. When the leg exchange integrals and fr…
The Phase Diagram of High-Tc Superconductors in the Presence of Dynamic Stripes
Annette Bussmann-Holder, Alan R. Bishop, Helmut Buettner +3
The phase diagram of superconducting copper oxides is calculated as a function of doping based on a theory of dynamic stripe induced superconductivity. The two major conclusions fr…
Quantum to classical crossover in the 2D easy-plane XXZ model
H. Fehske, C. Schindelin, A. Weiße +2
Ground-state and thermodynamical properties of the spin-1/2 two-dimensional easy-plane XXZ model are investigated by both a Green's-function approach and by Lanczos diagonalization…