Lattice Dynamics of 1T-TaTe2

Exciton condensation driving the periodic lattice distortion of 1T-TiSe2.

We address the lattice deformation of 1T-TiSe2 within the exciton condensate phase. We show that, at low temperature, condensed excitons influence the lattice through electron-phonon interaction. It is found that at zero temperature, in the exciton condensate phase of 1T-TiSe2, this exciton condensate exerts a force on the lattice generating ionic displacements comparable in amplitude to what i...

Structural Dynamics in the Charge Density Wave Compound 1T-TaS2

This Diploma thesis is centered around the study of the structural dynamics in charge density wave (CDW) compounds. Owing to their quasi low dimensionality, CDWs present an ideal model system to investigate the delicate interplay between various degrees of freedom like spins, electrons, lattice, etc., common to macroscopic quantum phenomena such as high-temperature-superconductivity and colossa...

Lattice Dynamics of Tetracyanoethylene

Chiral charge order in 1T -TiSe2: Importance of lattice degrees of freedom

B. Zenker,1 H. Fehske,1 H. Beck,2 C. Monney,3 and A. R. Bishop4 1Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, D-17489 Greifswald, Germany 2Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, CH-1700 Fribourg, Switzerland 3Fritz-Haber-Institut der Max Planck Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany 4Theory, Simulation, and Computat...

Dynamics of lattice kinks

We consider a class of Hamiltonian nonlinear wave equations governing a field defined on a spatially discrete one dimensional lattice, with discreteness parameter, d = h, where h > 0 is the lattice spacing. The specific cases we consider in detail are the discrete sine-Gordon (SG) and discrete φ models. For finite d and in the continuum limit (d → ∞) these equations have static kink-like (heter...