BEGIN:VCALENDAR
VERSION:2.0
PRODID:www.dresden-science-calendar.de
METHOD:PUBLISH
CALSCALE:GREGORIAN
X-MICROSOFT-CALSCALE:GREGORIAN
X-WR-TIMEZONE:Europe/Berlin
BEGIN:VTIMEZONE
TZID:Europe/Berlin
X-LIC-LOCATION:Europe/Berlin
BEGIN:DAYLIGHT
TZNAME:CEST
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
DTSTART:19810329T030000
RRULE:FREQ=YEARLY;INTERVAL=1;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:CET
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
DTSTART:19961027T030000
RRULE:FREQ=YEARLY;INTERVAL=1;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
UID:DSC-22357
DTSTART;TZID=Europe/Berlin:20251118T160000
SEQUENCE:1763447848
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20251118T183000
URL:https://dresden-science-calendar.de/calendar/de/detail/22357
LOCATION:MPI-PKS\, Nöthnitzer Straße 3801187 Dresden
SUMMARY:Herbut: Physik-Preis Dresden 2025: Unified theory of interacting Di
 rac fermions in two dimensions
CLASS:PUBLIC
DESCRIPTION:Speaker: Prof. Dr. Igor Herbut\nInstitute of Speaker: Simon Fra
 ser University\nTopics:\nPhysik\n Location:\n  Name: MPI-PKS ()\n  Street:
  Nöthnitzer Straße 38\n  City: 01187 Dresden\n  Phone: + 49 (0)351 871 0
 \n  Fax: \nDescription: Dirac fermions appear as low-energy quasiparticle 
 excitations in many condensed matter systems of current interest.  They ar
 e often weakly interacting\, as famously in graphene\, for example\, but a
 t interactions of intermediate strength they can also exhibit many ordered
  ground states by going through phase transitions at which gapless Dirac f
 ermions play a crucial role. Prime example of such a transition occurs in 
 the Hubbard model on honeycomb lattice at half filling\, which has a Dirac
  semimetal - Mott insulator transition in the so-called Heisenberg-Gross-N
 eveu universality class. I will present a unified theory of order paramete
 rs for Dirac systems in two-dimensions\, based on hidden O(8) symmetry tha
 t emerges in the Majorana representation of Dirac fermions. The interactin
 g relativistic field theory with the full O(8) symmetry turns out to be no
 thing else but the celebrated Gross-Neveu model. I will argue\, however\, 
 that this well-studied model has a novel phase transition at a strong inte
 raction of previously poorly unexplored sign\, at which the O(8) becomes s
 pontaneously broken.  The problem of the universality class of this transi
 tion\, in which the order parameter is a symmetric second-rank tensor coup
 led to relativistic fermions\, and the effect of a finite chemical potenti
 al on the phase diagram\, will be also discussed.
DTSTAMP:20260508T140033Z
CREATED:20251003T053926Z
LAST-MODIFIED:20251118T063728Z
END:VEVENT
END:VCALENDAR