Avalanches in a nonlinear oscillator chain in a periodic potential

Dirk Hennig, Andrew Burbanks, Andrew Osbaldestin

Research output: Contribution to journalArticlepeer-review


We consider the dynamics of a chain of coupled units evolving in a periodic substrate potential. The chain is initially in a flat state and situated in a potential well. A bias force, acting as a weak driving mechanism, is applied at a single unit of the chain. We study the instigation of directed transport in two types of system: (i) a microcanonical situation associated with deterministic and conservative dynamics and (ii) the Langevin dynamics when the system is in contact with a heat bath. Interestingly, for the deterministic and conservative dynamics the directed transport is drastically enhanced compared with its Langevin counterpart. In particular, in the deterministic and conservative regime a self-organised redistribution of energy triggers huge-sized avalanches yielding ultimately accelerated transport of the chain. In contrast, in the thermally-assisted process between avalanches the chain settles always into a pinned metastable state impeding continual accelerated chain motion.
Original languageEnglish
Pages (from-to)145-156
Number of pages12
JournalThe European Physical Journal Special Topics
Issue number1
Publication statusPublished - 2010


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