A chain, a bath, a sink and a wall

Iubini, Stefano and Lepri, Stefano and Livi, Roberto and Oppo, Gian-Luca and Politi, Antonio (2017) A chain, a bath, a sink and a wall. Entropy, 19 (9). 445. ISSN 1099-4300

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    Abstract

    We numerically investigate out-of-equilibrium stationary processes emerging in a Discrete Nonlinear Schrödinger chain in contact with a heat reservoir (a bath) at temperature TL and a pure dissipator (a sink) acting on opposite edges. Long-time molecular-dynamics simulations are performed by evolving the equations of motion within a symplectic integration scheme. Mass and energy are steadily transported through the chain from the heat bath to the sink. We observe two different regimes. For small heat-bath temperatures TL and chemical-potentials, temperature profiles across the chain display a non-monotonous shape, remain remarkably smooth and even enter the region of negative absolute temperatures. For larger temperatures TL, the transport of energy is strongly inhibited by the spontaneous emergence of discrete breathers, which act as a thermal wall. A strongly intermittent energy flux is also observed, due to the irregular birth and death of breathers. The corresponding statistics exhibit the typical signature of rare events of processes with large deviations. In particular, the breather lifetime is found to be ruled by a stretched-exponential law.

    ORCID iDs

    Iubini, Stefano, Lepri, Stefano, Livi, Roberto, Oppo, Gian-Luca ORCID logoORCID: https://orcid.org/0000-0002-5376-4309 and Politi, Antonio;
    • Item type:Article
      ID code:61940
      Dates:
      Date
      Event
      25 August 2017
      Published
      24 August 2017
      Accepted
      Keywords:discrete nonlinear schrödinger, discrete breathers, negative temperatures, open systems, Physics, Physics and Astronomy(all)
      Subjects:Science > Physics
      Department:Faculty of Science > Physics
      Depositing user: Pure Administrator
      Date deposited:06 Oct 2017 10:39
      Last modified:14 May 2021 00:34
      Related URLs:
      URI:https://strathprints.strath.ac.uk/id/eprint/61940
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