FisMat2017 - Submission - View

Abstract's title: A chain, a bath, a sink and a wall
Submitting author: Stefano Iubini
Affiliation: University of Florence
Affiliation Address: Via G. Sansone 1, 50019 Sesto Fiorentino (FI)
Country: Italy
Oral presentation/Poster (Author's request): Oral presentation
Other authors and affiliations: Stefano Lepri (ISC-CNR Florence), Roberto Livi (University of Florence), Gian-Luca Oppo (University of Strathclyde, UK), Antonio Politi (University of Aberdeen, UK)

Peculiar out-of-equilibrium stationary processes may emerge in a Discrete Nonlinear Schroedinger chain with a heat reservoir and a pure mass dissipator acting at its opposite edges. By increasing the temperature of the reservoir, a transition between two distinct regimes occurs. In the low temperature regime the temperature and chemical potential profiles display a smooth shape characteristic of thermodiffusive processes. Remarkably, a regime of negative absolute temperatures emerges spontaneously. In the high temperature regime, localized structures (discrete breathers) naturally arise out of the fluctuations and act as a "thermal wall" that strongly inhibits the flows of energy and mass towards the dissipator. The systems turns into a quasi-insulator.