CMSP Seminar @ICTP EULER Lecture room Wednesday 27 July at 2.00 p.m. - Tony J.G. APOLLARO

[Condensed Matter Section]

Condensed Matter and Statistical Physics Seminar
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Attention: please note unusual VENUE and TIME

Wednesday 27 July at 14:00
EULER Lecture Hall, terrace level, Leonardo building

Tony J.G. APOLLARO(Universita' degli Studi di Palermo)

Title: "Fate of Quantum Critical Scaling under Periodic Driving"

Abstract:

Quantum many body systems driven out-of-equilibrium by means of 
time-dependent
Hamiltonians are currently of great interest both theoretically and 
experimentally. In this
talk the quantum Ising model with a periodic modulation of the 
transverse magnetic field
is considered and its dynamical properties are investigated under 
different driving conditions.
The Ising model is the simplest many body system exhibiting a second 
order quantum phase
transition at the critical value of the transverse field h=h_c, where 
both magnetic observables,
and other physical quantities that are not observables in the 
quantum-mechanical sense,
exhibit scaling relations: the transverse magnetic susceptibility, the 
concurrence, the fidelity
susceptibility all display finite-size scaling according to the 
exponents belonging to the Ising
universality class at criticality. We address the question of the 
validity of these scaling relations
when the system is periodically driven across the critical point. 
Furthermore, the asymptotic
steady state Entanglement Entropy is investigated, showing that it 
approaches a volume law.