Speaker
Simone Borlenghi
(Uppsala University)
Description
I will present an overview on recent research on the
off-equilbrium discrete nonlinear Schrödinger equation.
The latter is a general semi-classical model that describes
networks of nonlinear oscillators, and has application in
several branches of Physics, including Bose-Einstein
condensates, spin systems, lasers, mechanical oscillators
and photosynthetic reactions. When some oscillators of the
network are coupled to stochastic bath at different
temperatures, the system reaches a non-equilibrium steady
states where coupled currents propagate. The essential
condition for current propagation is the
phase-synchronisation of the oscillators, indicating a deep
relation between irreversibility an phase-coherence, that
can be expressed by means of a general fluctuation theorem.
I will present several examples of realistic spin devices,
where transport can be enhanced or suppressed by controlling
the phase synchronisation between the spin-oscillators,
giving rises to interesting phenomena, such as thermal/spin
rectification.
References:
S. Iubini et al.,Phys. Rev. E 86, 011108 (2012).
S. Borlenghi et al., Phys. Rev. Lett 112, 047203 (2014).
S. Borlenghi et al., Phys. Rev E 92, 012116 (2015).
S. Borlenghi, Phys. Rev. E 93, 012133 (2016).
