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8 papers · 1 filter
Quantum lattice dynamical effects on the single-particle excitations in 1D Mott and Peierls insulators
H. Fehske, G. Wellein, G. Hager +2
As a generic model describing quasi-one-dimensional Mott and Peierls insulators, we investigate the Holstein-Hubbard model for half-filled bands using numerical techniques. Combini…
Sp(n)U(1)-connections with parallel totally skew-symmetric torsion
Bogdan Alexandrov
We consider the unique Hermitian connection with totally skew-symmetric torsion on a Hermitian manifold. We prove that if the torsion is parallel and the holonomy is Sp(n)U(1), con…
Constructing Extensions of CP-Maps via Tensor Dilations with the Help of Von Neumann Modules
Rolf Gohm, Michael Skeide
We apply Hilbert module methods to show that normal completely positive maps admit weak tensor dilations. Appealing to a duality between weak tensor dilations and extensions of CP-…
Standard dilations of q-commuting tuples
Santanu Dey
Here we study dilations of q-commuting tuples. In [BBD] the authors gave the correspondence between the two standard dilations of commuting tuples and here these results have been…
Lattice and superexchange effects in doped CMR manganites
Alexander Weisse, Holger Fehske
We report on the influence of the lattice degrees of freedom on charge, orbital and spin correlations in colossal magnetoresistance (CMR) manganites. For the weakly doped compounds…
On the Entropy and Letter Frequencies of Ternary Square-Free Words
Christoph Richard, Uwe Grimm
We enumerate all ternary length-l square-free words, which are words avoiding squares of words up to length l, for l<=24. We analyse the singular behaviour of the corresponding gen…