Nonlinear cellular automata rules produce frustrated spin models whose quantum versions exhibit order-by-disorder and first-order phase transitions to paramagnets.
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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.
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Spin models from nonlinear cellular automata
Nonlinear cellular automata rules produce frustrated spin models whose quantum versions exhibit order-by-disorder and first-order phase transitions to paramagnets.
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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.