Numerical study of tetramer Heisenberg chain finds transition between tetramer and Haldane phases via deconfined critical state, with spinon/triplon/quinton excitations visible in RIXS for CuInVO5.
Haldane, Continuum dynamics of the 1-d heisenberg antifer- romagnet: Identification with the o(3) nonlinear sigma model, Physics Letters A 93, 464 (1983)
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Spin order, spin excitations, and RIXS spectra of spin-1/2 tetramer chains
Numerical study of tetramer Heisenberg chain finds transition between tetramer and Haldane phases via deconfined critical state, with spinon/triplon/quinton excitations visible in RIXS for CuInVO5.