BEGIN:VCALENDAR VERSION:2.0 PRODID:-//wp-events-plugin.com//6.4.7.2//EN TZID:Europe/Paris X-WR-TIMEZONE:Europe/Paris BEGIN:VEVENT UID:0-1106@lptms.universite-paris-saclay.fr DTSTART;TZID=Europe/Paris:20260407T110000 DTEND;TZID=Europe/Paris:20260407T120000 DTSTAMP:20260330T174152Z URL:http://www.lptms.universite-paris-saclay.fr/seminars/lptms-seminar-osc ar-bouverot-dupuis-alice-marche-lptms-orsay/ SUMMARY:LPTMS Seminar: Oscar Bouverot-Dupuis &\; Alice Marché (LPTMS\, Orsay) - Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°5 30 - 7 Avr 26 11:00 DESCRIPTION:Effect of dissipation on the one-dimensional Mott transition\nO scar Bouverot-Dupuis (LPTMS\, Orsay)\n \;\n\nIn one-dimensional quantu m systems\, the Mott transition is a well-understood superfluid-to-insulat or transition separating a perfectly conducting Luttinger liquid (LL) from a Mott insulator (MI). In this talk\, I will explore how this transition is modified when the system is coupled to local dissipative baths. Using a Caldeira-Leggett description of the environment and bosonization techniqu es\, the problem can be mapped onto an effective (1+1)D field theory with non-Markovian interactions induced by dissipation. As a starting point\, I will revisit the dissipation-free case and show how physical insights all ow to design efficient Monte Carlo algorithms. These algorithms are then u sed on the dissipative problem to establish its full phase diagram. This r eveals that dissipation qualitatively alters the transition: the direct LL -MI transition is avoided by the appearance of a intermediate dissipation- induced phase.\n\n \;\nObserving weakly broken conservation laws in a dipolar Rydberg quantum spin chain\nAlice Marché (LPTMS\, Orsay)\n \; \n\nIntegrability\, one of the main technical theoretical tools for the an alysis of models of physical setups\, is not just a mathematical property: it has deep physical consequences. Integrable and non-integrable setups d isplay qualitative different physical behaviours\, related to the presence (or absence) of families of extensive conservation laws. In the presence of weak perturbations\, a well-known dilemma takes place: is the system ak in to a thoroughly non-integrable setup\, or does it carry memory that int egrability has been only weakly broken? In this theoretical and experiment al collaboration we show that the weak breaking of conservation laws leave s a clear experimental fingerprint in a one-dimensional quantum spin chain of as few as 14 Rydberg atoms. Weak integrability breaking from resonant dipole-dipole interactions is directly detectable within experimentally ac cessible times in the dynamics of non-local observables. In particular\, m agnetization fluctuations are highly sensitive to the breaking of fragile conservation laws and exhibit anomalous growth\, which we observe experime ntally\; similar signatures appear in a semilocal string observable. We es tablish Rydberg-atom arrays as a platform to test perturbative description s of quantum many-body dynamics with weak integrability breaking. Based o n: https://arxiv.org/abs/2602.02251 CATEGORIES:seminars LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53 0\, rue André Riviere\, Orsay\, 91405\, France X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\ , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°530:geo:0,0 END:VEVENT BEGIN:VTIMEZONE TZID:Europe/Paris X-LIC-LOCATION:Europe/Paris BEGIN:DAYLIGHT DTSTART:20260329T030000 TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST END:DAYLIGHT END:VTIMEZONE END:VCALENDAR