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UID:DSC-6867
DTSTART;TZID=Europe/Berlin:20140312T110000
SEQUENCE:1394610167
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20140312T120000
URL:https://dresden-science-calendar.de/calendar/en/detail/6867
LOCATION:MPI-PKS\, Nöthnitzer Straße 3801187 Dresden
SUMMARY:Kovacs: Infinitely disordered critical behavior
CLASS:PUBLIC
DESCRIPTION:Speaker: Istvan Kovacs\nInstitute of Speaker: Hungarian Academy
  of Sciences\nTopics:\nPhysik\n Location:\n  Name: MPI-PKS (Room 1D1)\n  S
 treet: Nöthnitzer Straße 38\n  City: 01187 Dresden\n  Phone: + 49 (0)351
  871 0\n  Fax: \nDescription: Phase transitions are among the most strikin
 g phenomena of nature. While continuously changing a given parameter\, the
  physical properties of the system display a sudden change at the transiti
 on point. At a continuous phase transition the emerging singularities are 
 powerful manifestations of collective phenomena\, exhibiting a broad unive
 rsality: the critical behavior is insensitive to microscopic details\, dep
 ending only on global characteristics. Since spatial inhomogeneity is an i
 nevitable feature of complex systems\, it is of basic importance to unders
 tand the possible effects of disorder around criticality. In condensed mat
 ter systems the dynamics of disorder is usually slow compared to experimen
 tal time scales\, thus inhomogeneities are well approximated by time-indep
 endent\, quenched disorder. The main result of this field is that\, quench
 ed disorder may dramatically change the critical behavior of the system al
 though being only a microscopic perturbation. For this scenario a paradigm
 atic example is the zero temperature quantum phase transition of the quant
 um Ising model\, exhibiting an exotic\, infinitely disordered critical beh
 avior. Besides the quantum Ising model\, there is a huge variety of furthe
 r examples\, such as the random walk in 1D or the simple infection spreadi
 ng model\, the contact process (SIS model).The profound effect of disorder
  extends also outside the critical point\, in the so called Griffiths phas
 es\, where the dynamical correlations are still long-ranged. During the ta
 lk I give an overview about phase transitions in strongly disordered syste
 ms focusing on my results leading to the first quantitative predictions in
  3 and even higher dimensional\, eg. small-world networks.
DTSTAMP:20260426T120700Z
CREATED:20140220T074246Z
LAST-MODIFIED:20140312T074247Z
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