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- Sergej Flach, D. O. Krimer, Ch . Skokos
- Physical review letters
- 2009

In the absence of nonlinearity all eigenmodes of a chain with disorder are spatially localized (Anderson localization). The width of the eigenvalue spectrum and the average eigenvalue spacing inside the localization volume set two frequency scales. An initially localized wave packet spreads in the presence of nonlinearity. Nonlinearity introduces frequency… (More)

- Ch . Skokos, D. O. Krimer, Stavros Komineas, Sergej Flach
- Physical review. E, Statistical, nonlinear, and…
- 2009

We consider the spatiotemporal evolution of a wave packet in disordered nonlinear Schrödinger and anharmonic oscillator chains. In the absence of nonlinearity all eigenstates are spatially localized with an upper bound on the localization length (Anderson localization). Nonlinear terms in the equations of motion destroy the Anderson localization due to… (More)

- Joshua D. Bodyfelt, T. V. Laptyeva, Ch . Skokos, D. O. Krimer, Sergej Flach
- Physical review. E, Statistical, nonlinear, and…
- 2011

We probe the limits of nonlinear wave spreading in disordered chains which are known to localize linear waves. We particularly extend recent studies on the regimes of strong and weak chaos during subdiffusive spreading of wave packets [Europhys. Lett. 91, 30001 (2010)] and consider strong disorder, which favors Anderson localization. We probe the limit of… (More)

Nonstationary pulse regimes associated with self modulation of a Kerr-lens modelocked Ti:sapphire laser have been studied experimentally and theoretically. Such laser regimes occur at an intracavity group delay dispersion that is smaller or larger than what is required for stable modelocking and exhibit modulation in pulse amplitude and spectra at… (More)

- D. O. Krimer, Ramaz Khomeriki, Sergej Flach
- Physical review. E, Statistical, nonlinear, and…
- 2009

We study the evolution of a wave packet in a nonlinear Stark ladder. In the absence of nonlinearity all normal modes are spatially localized giving rise to an equidistant eigenvalue spectrum and Bloch oscillations. Nonlinearity induces frequency shifts and mode-mode interactions and destroys localization. For large strength of nonlinearity we observe… (More)

We study the non-Markovian quantum dynamics of an emitter inside an open multimode cavity, focusing on the case where the emitter is resonant with high-frequency cavity modes. Based on a Green’s-function technique suited for open photonic structures, we study the crossovers between three distinct regimes as the coupling strength is gradually increased: (i)… (More)

- Kurt Bräuer, Michael Pfitzner, D. O. Krimer, Michael Mayer, Yimin Jiang, M . Faesslerf J . K . Liu
- Physical review. E, Statistical, nonlinear, and…
- 2006

An elastic-strain-stress relation, the result of granular elasticity as introduced in the preceding paper, is employed here to calculate the stress distribution (a) in cylindrical silos and (b) under point loads assuming uniform density. In silos, the ratio k{J} between the horizontal and vertical stress is found to be constant (as conjectured by Janssen)… (More)

- Joshua D. Bodyfelt, T. V. Laptyeva, G. Gligoric, D. O. Krimer, Charalampos Skokos, S. Flach
- I. J. Bifurcation and Chaos
- 2011

- D. O. Krimer, Sergej Flach
- Physical review. E, Statistical, nonlinear, and…
- 2010

We study the properties of mode-mode interactions for waves propagating in nonlinear disordered one-dimensional systems. We focus on (i) the localization volume of a mode which defines the number of interacting partner modes, (ii) the overlap integrals which determine the interaction strength, (iii) the average spacing between eigenvalues of interacting… (More)

- D. O. Krimer, Michael Pfitzner, Kurt Bräuer, Yimin Jiang, M . Faesslerf J . K . Liu
- Physical review. E, Statistical, nonlinear, and…
- 2006

Granular materials are predominantly plastic, incrementally nonlinear, preparation-dependent, and anisotropic under shear. Nevertheless, their static stress distribution is well accounted for, in the whole range up to the point of failure, by a judiciously tailored isotropic nonanalytic elasticity theory termed granular elasticity. The first purpose of this… (More)