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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-361@lptms.universite-paris-saclay.fr
DTSTART:20150522T110000Z
DTEND:20150522T121500Z
DTSTAMP:20150513T113626Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-quantiq
 ue-informel-du-lptms-alberto-rosso/
SUMMARY:Séminaire quantique informel du LPTMS : Alberto Rosso - LPTMS\, sa
 lle 201\, 2ème étage\, Bât 100\, Campus d'Orsay - 22 Mai 15 11:00
DESCRIPTION:Dynamic Nuclear Polarization and the paradox of Quantum Thermal
 ization\nAlberto Rosso (LPTMS)\n\nDynamic Nuclear Polarization (DNP) is to
  date the most  effective technique to increase the nuclear polarization 
 up to a factor 100\,000 opening disruptive perspectives for medical applic
 ations. In DNP\, the nuclear spins are driven to an - out of equilibrium -
  hyperpolarized state by microwave saturation of the electron spins in int
 eraction with them. Here we show that the electron dipolar interactions co
 mpete with the local magnetic fields resulting in two distinct dynamical p
 hases: for strong interactions the electron spins equilibrate to an extrem
 ely low effective temperature that boosts  DNP  efficiency. For weak int
 eraction this spin temperature is not defined and the polarization profile
  has an 'hole burning' shape characteristic of the non interacting case. T
 he study of the many-body eigenstates reveals that these two phases are in
 timately related to the problem of thermalization in closed quantum system
 s where breaking of ergodicity is expected varying the strength of the int
 eractions.
CATEGORIES:seminars
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
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