Polarobreathers in soft potentials

Abstract

We consider polarons in models of coupled electronic and vibrational degrees of freedom, in the presence of a soft nonlinear inter-particle potential (Morse potential). In particular, we focus on a a bound state of a polaron with a breather, a so-called ``polarobreather''. We analyze the existence of this branch based on frequency resonance conditions and illustrate its stability using Floquet spectrum techniques. Multi-site solutions of this type are also obtained both in the stationary case (two-site polarons) and in the breathing case (two-site polarobreathers). We also obtain a different branch of solutions, namely a polaronic nanopteron.

7 pages, 10 figures

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• Theory of Nonlinear Matter Waves in Optical Lattices
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Cited by in corpus (2)

• Self-organized escape of oscillator chains in nonlinear potentials
• Dynamics of Holstein polaron in a chain with thermal fluctuations