BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Nonequilibrium quantum and statistical physics - ECPv4.9.9//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:Nonequilibrium quantum and statistical physics X-ORIGINAL-URL:https://chaos.fmf.uni-lj.si X-WR-CALDESC:Events for Nonequilibrium quantum and statistical physics BEGIN:VTIMEZONE TZID:Europe/Ljubljana BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:20180325T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20181028T010000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=Europe/Ljubljana:20180918T140000 DTEND;TZID=Europe/Ljubljana:20180918T160000 DTSTAMP:20240328T230343 CREATED:20180906T094708Z LAST-MODIFIED:20180906T094921Z UID:686-1537279200-1537286400@chaos.fmf.uni-lj.si SUMMARY:Fabio Franchini: The Frustration in being Odd: area law violation in local systems DESCRIPTION:We demonstrate the existence of a new quantum phase of matter that arises in antiferromagnetic spin chains with a weak frustration -just one bond in a large chain-. This is the case\, for instance\, in systems with an odd number of spins with periodic boundary conditions. Such new phase is extended\, gapless\, but non-relativistic: the low-energy excitations have a quadratic (Galilean) spectrum. Locally\, the correlation functions in the ground state do not show significant deviations\, compared to the non-frustrated case\, but correlators involving a number of sites (or distances) scaling like the system size display new behaviors. In particular\, the von Neumann entanglement entropy is found to follow new rules\, for which neither area law applies\, nor one has a divergence of the entropy with the system size. Such very long-range correlations are novel and of potential technological interest. We display such new phase in a few prototypical chains using numerical simulations and we study analytically the paradigmatic example of the Ising chain. Through these examples we argue that this phase emerges generally in (weakly) frustrated systems with discrete symmetries. \n* Fabio Franchini\, Ruđer Bošković Institute\, Zagreb \n[1] Salvatore Marco Giampaolo\, Flávia Braga Ramos\, Fabio Franchini\, arXiv:1807.07055 \n URL:https://chaos.fmf.uni-lj.si/event/fabio-franchini-the-frustration-in-being-odd-area-law-violation-in-local-systems/ LOCATION:Kuščerjev seminar\, Fakulteta za matematiko in fiziko UL\, Jadranska 19\, Ljubljana\, Slovenia END:VEVENT END:VCALENDAR