Fractional spin-wave continuum in spin liquid states on the kagome lattice

          @misc{ pirsa_PIRSA:15070063,
            doi = {10.48660/15070063},
            url = {https://pirsa.org/15070063},
            author = {Mei, Jia-Wei},
            keywords = {Condensed Matter, Quantum Gravity, Quantum Information},
            language = {en},
            title = {Fractional spin-wave continuum in spin liquid states on the kagome lattice   },
            publisher = {Perimeter Institute},
            year = {2015},
            month = {jul},
            note = {PIRSA:15070063 see, \url{https://pirsa.org}}
          }
          

Abstract

Motivated by spin-wave continuum (SWC) observed in recent neutron scattering experiments in Herbertsmithite, we use Gutzwiller-projected wave functions to study dynamic spin structure factor of spin liquid states on the kagome lattice. As their ground state, spin-1 excited states for spin liquids are represented by Gutzwiller-projected two-spinon excited wave functions. We investigate three different spin liquid candidates, spinon Fermi-surface spin liquid (FSL), Dirac spin liquid (DSL) and random-flux spin liquid (RSL). We find that DSL has no explicit contradiction with experiments. Besides a fractionalized spin moment, DSL has a fractionalized crystal momentum which is also detectable directly in the neutron scattering measurements.