Tuesday, July 23, 2013

1307.5419 (Debarshee Bagchi)

Thermally driven classical Heisenberg model in one dimension with a
local time-varying field

Debarshee Bagchi
We study thermal transport in the one dimensional classical Heisenberg model driven by boundary heat baths in presence of a local time varying magnetic field that acts at one end of the system. The system is studied numerically using an energy conserving discrete-time odd even dynamics. We find that the steady state energy current shows thermal resonance as the frequency of the time- periodic forcing is varied. When the amplitude of the forcing field is increased the system exhibits multiple resonance peaks instead of a single peak. Both single and multiresonance survive in the thermodynamic limit and their magnitudes increase as the average temperature of the system is decreased. Finally we show that, although a reversed thermal current can be made to flow through the bulk for a certain range of the forcing frequency, the system fails to behave as a heat pump, thus revalidating the fact that thermal pumping is generically absent in such force-driven lattices.
View original: http://arxiv.org/abs/1307.5419

No comments:

Post a Comment