DMRG study of frustrated four-leg spin-1/2 ladder finds three regimes including effective spin-2 Heisenberg chain confirmed by string order and effective Hamiltonian, with phase diagrams from coupled two-leg ladders.
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Competing spin-1 and spin-2 regimes in a frustrated four-leg spin-1/2 ladder
DMRG study of frustrated four-leg spin-1/2 ladder finds three regimes including effective spin-2 Heisenberg chain confirmed by string order and effective Hamiltonian, with phase diagrams from coupled two-leg ladders.