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Anomalous conductivity: impact of nonlinearity and disorder
M. V. Ivanchenko, S. Flach
We reveal the intricate impact of nonlinearity and disorder on the thermal conductivity of acoustic chains. Disorder induces mobility edges and allows to control the amount of exte…
The crossover from strong to weak chaos for nonlinear waves in disordered systems
T. V. Laptyeva, J. D. Bodyfelt, D. O. Krimer +2
We observe a crossover from strong to weak chaos in the spatiotemporal evolution of multiple site excitations within disordered chains with cubic nonlinearity. Recent studies have…
Energy carriers in the Fermi-Pasta-Ulam lattice: Solitons or Phonons?
Nianbei Li, Baowen Li, Sergej Flach
We investigate anomalous energy transport processes in the Fermi-Pasta-Ulam lattice. They are determined by the maximum sound velocity of the relevant weakly damped energy carr…
Interaction induced fractional Bloch and tunneling oscillations
Ramaz Khomeriki, Dmitry O. Krimer, Masudul Haque +1
We study the dynamics of few interacting bosons in a one-dimensional lattice with dc bias. In the absence of interactions the system displays single particle Bloch oscillations. Fo…
Quantum discrete breathers
Ricardo A. Pinto, Sergej Flach
We review recent studies about quantum discrete breathers. We describe their basic properties in comparison with their classical counterparts, and the ways they may be addressed th…