Shuttling heat across 1D homogenous nonlinear lattices with a Brownian heat motor

Details Shuttling heat across 1D homogenous nonlinear lattices with a Brownian heat motor Shuttling heat across 1D homogenous nonlinear lattices with a Brownian heat motor

2009-04-02

arxiv.org/abs/0904.0356v3

Phys. Rev. E 80, 011125 (2009)

Physics

Condensed Matter

Statistical Mechanics

9 pages, 10 figures. Phys. Rev. E (in press)

Scientific paper

10.1103/PhysRevE.80.011125

We investigate directed thermal heat flux across 1D homogenous nonlinear lattices when no net thermal bias is present on average. A nonlinear lattice of Fermi-Pasta-Ulam-type or Lennard-Jones-type system is connected at both ends to thermal baths which are held at the same temperature on temporal average. We study two different modulations of the heat bath temperatures, namely: (i) a symmetric, harmonic ac-driving of temperature of one heat bath only and (ii) a harmonic mixing drive of temperature acting on both heat baths. While for case (i) an adiabatic result for the net heat transport can be derived in terms of the temperature dependent heat conductivity of the nonlinear lattice a similar such transport approach fails for the harmonic mixing case (ii). Then, for case (ii), not even the sign of the resulting Brownian motion induced heat flux can be predicted a priori. A non-vanishing heat flux (including a non-adiabatic reversal of flux) is detected which is the result of an induced dynamical symmetry breaking mechanism in conjunction with the nonlinearity of the lattice dynamics. Computer simulations demonstrate that the heat flux is robust against an increase of lattice sizes. The observed ratchet effect for such directed heat currents is quite sizable for our studied class of homogenous nonlinear lattice structures, thereby making this setup accessible for experimental implementation and verification.

Affiliated with

Also associated with

No associations

Rating

Shuttling heat across 1D homogenous nonlinear lattices with a Brownian heat motor does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Shuttling heat across 1D homogenous nonlinear lattices with a Brownian heat motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shuttling heat across 1D homogenous nonlinear lattices with a Brownian heat motor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-63770