Zobrazeno 1 - 10
of 221
pro vyhledávání: '"Letz, M."'
Publikováno v:
In Computational Materials Science March 2019 159:73-85
Autor:
Letz, M., Parthier, L.
Charge centers in ionic crystals provide a channel for elementary interaction between electromagnetic radiation and the lattice. We calculate the electronic ground state energies which are needed to create a charge center -- namely a $F$- and a $H$-c
Externí odkaz:
http://arxiv.org/abs/cond-mat/0607725
Publikováno v:
Phys. Rev. B, 67, 233101 (2003)
The energy level of the exciton around the $\Gamma$ point in CaF$_2$ at about 11.1 eV was investigated by reflection measurements on oriented surfaces using dispersed synchrotron radiation. A small but clear energy shift of the exciton resonance stru
Externí odkaz:
http://arxiv.org/abs/cond-mat/0306510
The microscopic mechanism beyond the optical anisotropy of an ionic crystal which occurs for short wavelengths is investigated. The electron-hole, two particle propagator and its analytical behaviour close to the band edge of the one particle continu
Externí odkaz:
http://arxiv.org/abs/cond-mat/0204282
We investigate hard ellipsoids of revolution in a parameter regime where no long range nematic order is present but already finite size domains are formed which show orientational order. Domain formation leads to a substantial slowing down of a colle
Externí odkaz:
http://arxiv.org/abs/cond-mat/0109314
To investigate the influence of orientational degrees of freedom onto the dynamics of molecular systems in its supercooled and glassy regime we have solved numerically the mode-coupling equations for hard ellipsoids of revolution. For a wide range of
Externí odkaz:
http://arxiv.org/abs/cond-mat/0109286
We investigate the dynamics of a fluid of dipolar hard spheres in its liquid and glassy phase, with emphasis on the microscopic time or frequency regime. This system shows rather different glass transition scenarios related to its rich equilibrium be
Externí odkaz:
http://arxiv.org/abs/cond-mat/0105393
Autor:
Himmerich, M., Letz, M.
Publikováno v:
Phys.Rev.B64:144519,2001
We derive simplified Faddeev type equations for the three particle T-matrix which are valid in the Hubbard model where only electrons with opposite spins interact. Using the approximation of dynamical mean field theory these equations are partially s
Externí odkaz:
http://arxiv.org/abs/cond-mat/0009262
Publikováno v:
Eur. Phys. J. B, 19, 323 (2001)
The theory of light scattering for a system of linear molecules with anisotropic polarizabilities is considered. As a starting point for our theory, we express the result of a scattering experiment in VV and VH symmetry as dynamic correlation functio
Externí odkaz:
http://arxiv.org/abs/cond-mat/0007029
Autor:
Letz, M., Schilling, R.
Publikováno v:
Phil. Mag. B 79 (11/12), 1815-1820, (1999)
Molecular fluids show rich and complicated dynamics close to the glass transition. Some of these observations are related to the fact that translational and orientational degrees of freedom couple in nontrivial ways. A model system which can serve as
Externí odkaz:
http://arxiv.org/abs/cond-mat/9908295