Laboratoire de Physique Théorique

de la Matière Condensée

Alberto Imparato (Aarhus University, Denmark)

Critical behaviour of interacting thermodynamic machines

It is known that in an equilibrium system approaching a critical point, the response to a change in an external thermodynamic force can become significantly large. In other words, an equilibrium system at the verge of a second-order phase transition is highly susceptible to external thermodynamic forces.

Starting from this premise, in my talk I will discuss the properties of systems of interacting thermodynamic machines that operate at the verge of a phase transition. I will focus on the performance of different types of out-of-equilibrium machines converting heat or other forms of energy into useful work. Specifically, I will consider:

i) an out-of-equilibrium lattice model consisting of 2D discrete rotators, in contact with heath reservoirs at different temperatures,

ii) an out-of-equilibrium Frenkel--Kontorova model moving over a periodic substrate and in a position dependent temperature profile,

iii ) a transverse field Ising model undergoing a quantum phase transition, and operating as a battery-charger system.