Joint ICTP/SISSA Statistical Physics Seminar Tuesday 21 Feb. at 11:00 a.m. STASI seminar room: S. CILIBERTO

[Condensed Matter Section]

JOINT ICTP/SISSA Statistical Physics Seminar

Tuesday 21 February at 11:00 a.m.

Luigi Stasi Seminar Room, ICTP, Leonardo building, first floor


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Speaker: Sergio CILIBERTO (Research Director CNRS, Lab. di
Physique, ENS de Lyon, France)

Title: A Protocol for Reaching Equilibrium Arbitrary Fast


Abstract:

When a control parameter of a system is suddenly changed, the accessible
phase space changes too and the system needs its characteristic relaxation
time to reach the final equilibrium distribution. An important and 
relevant question
is whether it is possible to travel from an equilibrium state to another 
in an arbitrary
time, much shorter than the natural relaxation time.

Such strategies are reminiscent of those worked out in the recent field 
of Shortcut
to Adiabaticity, that aim at developing protocols, both in quantum and 
in classical
regimes, allowing the system to move as fast as possible from one 
equilibrium position
to a new one, provided that there exist an adiabatic transformation 
relating the two.
Proof of principle experiments have been carried out for isolated 
systems. Instead
in open system the reduction of the relaxation time, which is frequently 
desired
and necessary, is often obtained by complex feedback processes.

In this talk, we present a protocol, named Engineering (ESE), that 
shortcuts
time-consuming relaxations. We tested experimentally this protocol on a 
Brownian
particle trapped in an optical potential first and then on an AFM 
cantilever. We show
that applying a specific driving, one can reach equilibrium in an 
arbitrary short time.
We also estimate the energetic cost to get such a time reduction.

Beyond its fundamental interest, the ESE method paves the way for 
applictions
in micro and nano devices, in high speed AFM, or in monitoring mesoscopic
chemical or biological process.

References:

(1) Engineered Swift Equilibration, Ignacio A. Martinez; Artyom Petrosyan;
David GuŽry-Odelin; Emmanuel Trizac; Sergio Ciliberto, Nature Physics,
Vol 12, 843 (2016).

(2) Arbitrary Fast Modulation of an Atomic Force Microscope, Anne Le 
Cunuder;
Ignacio A. Martinez; Artyom Petrosyan; David GuŽry-Odelin; Emmanuel Trizac;
Sergio Ciliberto. Applied Physics Letters, 109, 113502 (2016)


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