Relaxation in dipolar spin ladders

From pair production to false-vacuum decay

verfasst von
Gustavo A. Domínguez-Castro, Thomas Bilitewski, David Wellnitz, Ana Maria Rey, Luis Santos
Abstract

Ultracold dipolar particles pinned in optical lattices or tweezers provide an excellent platform for the study of the intriguing equilibration dynamics of spin models with dipolar exchange. Starting with an initial state in which spins of opposite orientation are prepared in each of the legs of a ladder lattice, we show that spin relaxation displays an unexpected dependence on interleg distance and dipole orientation. This dependence, stemming from the interplay between intra- and interleg interactions, results in three distinct relaxation regimes: (i) ergodic, characterized by the fast relaxation towards equilibrium of correlated pairs of excitations generated at exponentially fast rates from the initial state; (ii) metastable, in which the state is quasilocalized in the initial state and only decays in exceedingly long timescales, resembling false-vacuum decay; and, surprisingly, (iii) partially relaxed, with coexisting fast partial relaxation and partial quasilocalization. The realization of this intriguing dynamics is at hand in current state-of-the-art experiments in dipolar gases.

Organisationseinheit(en)
Institut für Theoretische Physik
Externe Organisation(en)
Oklahoma State University
Joint Institute for Laboratory Astrophysics (JILA)
University of Colorado Boulder
Typ
Letter
Journal
Physical Review A
Band
110
Anzahl der Seiten
6
ISSN
2469-9926
Publikationsdatum
15.08.2024
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Atom- und Molekularphysik sowie Optik
Elektronische Version(en)
https://doi.org/10.48550/arXiv.2311.18091 (Zugang: Offen)
https://doi.org/10.1103/PhysRevA.110.L021302 (Zugang: Geschlossen)