text:   spin chains",1,"['Hal Tasaki\n""Topological phase transition and Z2 index for S=1 quantum spin chains""\nMy new paper on #QuantumSpin chains, which contains the first rigorous proof that the AKLT model is in a nontrivial SPT phase.  The argument, which I like, is quite pretty.\n<LINK>']",18,04,261