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You are here: Home / Seminars / Theoretical Physics / What is common between disordered elastic systems, the sandpile model, loop erased random walks and the phi4 theory?

What is common between disordered elastic systems, the sandpile model, loop erased random walks and the phi4 theory?

Alberto Imaprato (Physics Departement, Univerity of Aarhus, Denmark)
When Jun 23, 2022
from 02:00 to 03:00
Where amphithèâtre G
Attendees Alberto Imaprato
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Jeudi 23 Juin

 

Title: Critical behaviour of interacting thermodynamic machines

Alberto Imaprato (Physics Departement, Univerity of Aarhus, Denmark)

 

Abstract:   


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.
For each of these systems, I will argue that the optimal operating regime occurs when the system is driven out-of-equilibrium in proximity of a phase transition.