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:0-814@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20220222T110000
DTEND;TZID=Europe/Paris:20220222T120000
DTSTAMP:20220210T105253Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-daniel-cabra-laplata/
SUMMARY:Séminaire du LPTMS :  Daniel Cabra (La Plata) - Petit amphi\, bât
 iment Pascal n° 530 - 22 Fév 22 11:00
DESCRIPTION:Multiferroics: Lattice assisted magneto-electric coupling\nDani
 el Cabra (Universidad Nacional de La Plata)\nHybrid seminar: onsite + zoom
 .\n\n\nZoom Link: https://cnrs.zoom.us/j/97529623199?pwd=Tm9tLy8vUUZDY2tq
 QmpNQnZFRTlqdz09\n\nMeeting ID: 975 2962 3199\nPasscode: 1kCW7x\n\n\nWe pr
 opose a microscopic magneto-electric model in which the coupling between s
 pins\nand electric dipoles is mediated by lattice distortions. The magnet
 ic sector is described\nby a Heisenberg model coupled directly to the latt
 ice via a standard spin-Peierls term and\nindirectly to the electric dipo
 le variables via the distortion of the surrounding electronic clouds.\nEl
 ectric dipoles are described by Ising variables for simplicity. We show t
 hat the effective\nmagneto-electric coupling which arises due to the inter
 connecting lattice deformations is\nquite efficient in one-dimensional ar
 rays. More precisely\, we show using bosonization and\nextensive DMRG nume
 rical simulations that by increasing the magnetic field above the spin\nP
 eierls gap\, a massive polarization switch-off occurs due to the prolifer
 ation of soliton pairs.\nIntroducing further neighbors couplings and singl
 e ion anisotropy\, the system also shows the\n"uudd" (or so-called antip
 hase) magnetic ordering observed in several type II multiferroic materials
 .\nWe also discuss recent results for a two-dimensional generalization.\n
CATEGORIES:seminars
LOCATION:Petit amphi\, bâtiment Pascal n° 530\, rue André Rivière\, Ors
 ay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Rivière\, Orsay
 \, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Petit amphi\, bâtiment Pasca
 l n° 530:geo:0,0
END:VEVENT
BEGIN:VTIMEZONE
TZID:Europe/Paris
X-LIC-LOCATION:Europe/Paris
BEGIN:STANDARD
DTSTART:20211031T020000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
END:STANDARD
END:VTIMEZONE
END:VCALENDAR