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Statut |
Confirmé |
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Série |
SEM-EXCEP |
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Domaines |
cond-mat |
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Date |
Jeudi 2 Juillet 2026 |
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Heure |
14:00 |
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Institut |
ESPCI |
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Salle |
Room Charpak, entrance building, ground floor, 10 rue Vauquelin, Paris |
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Nom de l'orateur |
Aguiar |
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Prenom de l'orateur |
Maria Carolina O. |
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Addresse email de l'orateur |
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Institution de l'orateur |
Universidade Federal de Minas Gerais, Belo Horizonte, Brazil |
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Titre |
Formation of charge and spin ordering in interacting one-dimensional systems during and after quantum quenches |
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Résumé |
In recent work by my group, we aim at investigating the emergence of charge and spin
orderings within the extended Hubbard model during and after quantum quenches. We use
the time-dependent density matrix renormalization group method to describe the dynamics.
Starting from the non-interacting disordered state, we track its time evolution as
electronic interactions increase over a finite time, eventually reaching final values in
the charge density wave or spin density wave phase. These final values are considered
for the free evolution of the system after the quench.
According to the rate at which we turn on the electronic interactions during the
quench, we identify three temporal regimes: abrupt, intermediate, and adiabatic [1].
Systems subject to the adiabatic regime follow the instantaneous ground state during the
quench and remain stable in the post-quench analysis, while those subject to abrupt
changes do not present ordering during or after the quench. In between, in the
intermediate case, after a significant increase during the quench, the order parameters
exhibit oscillatory behavior in the post-quench, also observed in the entanglement
entropy and the fidelity between states. Exact diagonalization analyses of small chains
show that these oscillations arise from coherent superpositions within the low-energy
spectrum of the Hamiltonian governing the post-quench dynamics.
[1] Isaac M. Carvalho et al., Phys. Rev. B 106, 195405 (2022). |
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Numéro de preprint arXiv |
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Commentaires |
Please contact seminaires-lpem@espci.fr for the zoom link |
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Fichiers attachés |
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