Maria Carolina O. Aguiar, Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil

Thursday July 20 2:00 pm (Paris time)
ESPCI, Room Holweck, Building C, 1st Floor

Quench dynamics of strongly correlated systems

In this seminar, I will address strongly correlated electron systems driven out of
equilibrium through a quantum quench protocol : the system is prepared in an initial
state, which is the ground state of a given Hamiltonian ; we then vary one or more
parameters of the model and let the system evolve in time according to the new
Hamiltonian.

I will discuss the main results we obtained (1) when suddenly coupling a magnetic
impurity to interacting chains, to study the formation of the Kondo effect, and (2) when
observing the formation of charge and spin orders from a disordered state during a finite
time quench. In the first case, we showed both numerically and analytically that the
electronic interactions in the chains favor the formation of the Kondo effect, that is,
it develops faster for finite interactions than in the non-interacting case. In the
second case, we concluded that a quench towards the charge-ordered phase must be slower
than the one towards the spin-ordered phase, to avoid entangled excited states from being
accessed during the process.

(1) Helena Bragança et al., Phys. Rev. B 103, 125152 (2021) ; Moallison F. Cavalcante,
Rodrigo G. Pereira and Maria C. O. Aguiar, Phys. Rev. B 107, 075110 (2023).
(2) Isaac M. Carvalho et al., Phys. Rev. B 106, 195405 (2022).


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