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:1-299@lptms.universite-paris-saclay.fr DTSTART:20141031T113000Z DTEND:20141031T121500Z DTSTAMP:20141017T104058Z URL:http://www.lptms.universite-paris-saclay.fr/seminars/journal-club-hagg ai-landa/ SUMMARY:Journal Club : Haggai Landa - LPTMS\, salle 201\, 2ème étage\, B ât 100\, Campus d'Orsay - 31 Oct 14 11:30 DESCRIPTION:Nanofriction in cold ion traps\, A. Benassi\, A. Vanoss &\; E. Tosatti\, Nature Communications 2\, 236 (2011)\nHaggai Landa (post doc LPTMS)\nSliding friction between crystal lattices and the physics of cold ion traps are so far non-overlapping fields. Two sliding lattices may eith er stick and show static friction or slip with dynamic friction\; cold ion s are known to form static chains\, helices or clusters\, depending on the trapping conditions. Here we show\, based on simulations\, that much coul d be learnt about friction by sliding\, through\, for example\, an electri c field\, the trapped ion chains over a corrugated potential. Unlike infin ite chains\, in which the theoretically predicted Aubry transition to free sliding may take place\, trapped chains are always pinned. Yet\, a proper ly defined static friction still vanishes Aubry-like at a symmetric–asym metric structural transition\, found for decreasing corrugation in both st raight and zig-zag trapped chains. Dynamic friction is also accessible in ringdown oscillations of the ion trap. Long theorized static and dynamic o ne-dimensional friction phenomena could thus become accessible in future c old ion tribology. LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 Rue Georges Clemenceau\, Orsay\, 91405\, France GEO:48.698185;2.181768 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 Rue Georges Clemenceau\, Orsay\, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=LPTMS\, salle 201\, 2è me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768 END:VEVENT END:VCALENDAR