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BEGIN:VEVENT
UID:DSC-10265
DTSTART;TZID=Europe/Berlin:20151111T171500
SEQUENCE:1447227584
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20151111T180000
URL:https://www.dresden-science-calendar.de/calendar/de/detail/10265
LOCATION:MPI-PKS\, Nöthnitzer Straße 3801187 Dresden
SUMMARY:Reuther: Classification of spin liquids with strong spin-orbit coup
 ling
CLASS:PUBLIC
DESCRIPTION:Speaker: Johannes Reuther\nInstitute of Speaker: FU Berlin\nTop
 ics:\nPhysik\n Location:\n  Name: MPI-PKS (Seminarroom 4)\n  Street: Nöth
 nitzer Straße 38\n  City: 01187 Dresden\n  Phone: + 49 (0)351 871 0\n  Fa
 x: \nDescription: Spin liquids are exotic types of quantum matter that do 
 not develop any symmetry-breaking order even at zero temperature. In this 
 talk I give an introduction to some basic properties of spin liquids such 
 as fractional spinon excitations and topological ground-state degeneracies
 . Using a fermionic formalism for the spin operators I explain how spin li
 quids can be described by gauge theories. The concept of the \"projective 
 symmetry group\" (PSG) method is introduced that allows one to classify di
 fferent spin-liquid states based on a fermionic mean-field decoupling of t
 he spin Hamiltonian. Particularly\, I discuss the effects of spin-orbit co
 upling and show that a PSG classification of spin liquids in the case of b
 roken SU(2) spin-rotation symmetry yields spin-liquids states with a topol
 ogical spinon band structure. Hence\, these states realize the remarkable 
 situation where a non-trivial topology is implemented in two different way
 s\, via the existence of deconfined spinon excitations and by a symmetry-p
 rotected topological spinon band structure.
DTSTAMP:20260708T144109Z
CREATED:20151105T080027Z
LAST-MODIFIED:20151111T073944Z
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