Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 28: CE: (General) Theory 2

TT 28.4: Vortrag

Dienstag, 15. März 2011, 14:45–15:00, HSZ 105

Phase diagram of an extended classical dimer model — •Daniel Charrier — Max Planck Institut fuer Physik Komplexer Systeme, Noethnitzer Strasse 38, 01187 Dresden

Dimer models have attracted the interest of researchers in various branches of physics, ranging from statistical and condensed matter physics to high-energy physics. Their distinctive properties essentially result from the close-packing condition, which imposes that on a lattice, each site should be part of one and only one dimer. This strict condition generates strong correlations between degrees of freedom, even when interactions are absent from the system. Some years ago, it has been proposed that these systems could also sustain non-Landau phase transitions, i.e, transitions that are not easily described by the conventional theory of critical phenomena. We present here some new results obtained from an extensive numerical study of the attractive dimer model on the cubic lattice. The phase diagram of the model is discussed and the peculiarity of each phase is exposed. It is confirmed that the universality class of the phase transitions does not match critical exponents of conventional Landau theories. Moreover, the critical exponents seem to be related to the ones observed in exotic transitions in frustrated quantum magnets.