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Quantized Transport in Two-Dimensional Spin-Ordered Structures
Ilaria Campana, Giancarlo Jug, Klaus Ziegler
We study in detail the transport properties of a model of conducting electrons in the presence of double-exchange between localized spins arranged on a 2D Kagome lattice, as introd…
Jahn-Teller systems at half filling: crossover from Heisenberg to Ising behavior
K. Ziegler
The Jahn-Teller model with electron-phonon coupling and local (Hubbard-like) Coulomb interaction is considered to describe a lattice system with two orbitals per site a…
Quantum phases in mixtures of fermionic atoms
C. Ates, K. Ziegler
A mixture of spin-polarized light and heavy fermionic atoms on a finite size 2D optical lattice is considered at various temperatures and values of the coupling between the two ato…
Finite E x beta Jahn-Teller Systems: A Continued-Fraction Approach
K. Ziegler
A recursive method is developed to treat electrons coupled to phonons. It is applied to small systems with Jahn-Teller coupling. Two cases are considered, a model with…
Electron-phonon interaction for adiabatic anharmonic phonons
K. Ziegler, D. Schneider
A model with Holstein-like electron-phonon coupling is studied in the limit of adiabatic phonons. The phonon distribution is anharmonic with two degenerate maxima. This model can b…