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TZID:Europe/Paris
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UID:1-11@lptms.universite-paris-saclay.fr
DTSTART:20120110T110000Z
DTEND:20120110T110000Z
DTSTAMP:20130418T124746Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-serguei-brazovski/
SUMMARY:Séminaire du LPTMS : Serguei Brazovski - LPTMS\, salle 201\, 2ème
  étage\, Bât 100\, Campus d'Orsay - 10 Jan 12 11:00
DESCRIPTION:Strong local and nonequilibrium events in electronic systems.\n
 Serguei Brazovskii (LPTMS)\nThis review seminar will report on resent join
 t experimental/theoretical studies of low-dimensional electronic system wi
 th symmetry broken states in general\, mostly electronic crystals\, notabl
 y charge density waves\, with extensions to superconductors. The selected 
 observations will be related to strong\, usually topologically nontrivial\
 , perturbations of the order parameter under an external impact. The patte
 rn may be either static\, induced by either electric field or doping or di
 sorder\, or dynamic\, under the optical pumping – a major recent trend i
 n solid state physics. Problems in temporal evolution and remnants of symm
 etry breaking phase transitions span subjects from high energy and cosmolo
 gy to condensed matter. Recent optical study [1] of a far-from-equilibrium
  electronic charge ordering recovered coherent aperiodic undulations of th
 e order parameter\, critical slowing down of the collective mode\, and evo
 lution of the particle-hole gap. Numerical modeling with no fitting parame
 ters allowed interpreting the observations\, particularly the spatio-tempo
 ral distortions arising from “earthquakes” - annihilation events of to
 pological defects in depth of the sample.  Strong perturbations are also r
 ecovered at the microscopic scale accessed by the new STM [2]\; there are 
 the amplitude solitons playing a role of neutral spin carriers - spinons. 
 Their aggregation into solitonic lattices gives rise to modulated phases i
 n spin-polarized superconductors or Charge Density Waves. Other experiment
 s on nano-junctions and their modeling recover the intrinsic reconstructio
 n by creating arrays of electronic vortices – dislocations. [1] In colla
 boration with D. Mihailovic group\, Ljubljana\, Slovenia. Yusupov\, et al\
 , “Coherent dynamics of macroscopic electronic order through a symmetry 
 breaking transition”\, Nature Physics\, 2010 [2] In collaboration with C
 \, Brun (Paris-Nano center)\, Z.Z. Wang (LPN\, Marcoussis)\, P. Monceau (I
 nst. Neel\, Grenoble). " Direct observation of spinons - the single-electr
 on solitons - in an electronic solid " \, PRL 2012\, to appear.
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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