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13 papers · 1 filter
Spin Liquid Phase in Anisotropic Triangular Lattice Heisenberg Model: Exact diagonalization and density-matrix renormalization group calculations
M. Q. Weng, D. N. Sheng, Z. Y. Weng +1
Based on exact diagonalization and density matrix renormalization group (DMRG) method, we show that an anisotropic triangle lattice Heisenberg spin model has three distinct quantum…
Theory of Anisotropic Hopping Transport due to Spiral Correlations in the Spin-Glass Phase of Underdoped Cuprates
Valeri N. Kotov, Oleg P. Sushkov
We study the in-plane resistivity anisotropy in the spin-glass phase of the high- cuprates, on the basis of holes moving in a spiral spin background. This picture follows fr…
Optical absorption and activated transport in polaronic systems
G. Schubert, G. Wellein, A. Weiße +2
We present exact results for the optical response in the one-dimensional Holstein model. In particular, by means of a refined kernel polynomial method, we calculate the ac and dc e…
Boundary susceptibility in the open XXZ-chain
Michael Bortz, Jesko Sirker
In the first part we calculate the boundary susceptibility in the open -chain at zero temperature and arbitrary magnetic field by Bethe ansatz. We present analytical…
Microscopic modelling of doped manganites
Alexander Weisse, Holger Fehske
Colossal magneto-resistance manganites are characterised by a complex interplay of charge, spin, orbital and lattice degrees of freedom. Formulating microscopic models for these co…
Thermodynamics of a Spin-1/2 Chain Coupled to Einstein Phonons
Alexander Bühler, Götz S. Uhrig, Jaan Oitmaa
A high order series expansion is employed to study the thermodynamical properties of a S=1/2 chain coupled to dispersionless phonons. The results are obtained without truncating th…