The "topological" charge for the finite XX quantum chain

Details The "topological" charge for the finite XX quantum chain The "topological" charge for the finite XX quantum chain

2000-04-14

arxiv.org/abs/cond-mat/0004241v1

Physics

Condensed Matter

Statistical Mechanics

5 pages

Scientific paper

10.1088/0305-4470/33/42/101

It is shown that an operator (in general non-local) commutes with the
Hamiltonian describing the finite XX quantum chain with certain non-diagonal
boundary terms. In the infinite volume limit this operator gives the
"topological" charge.

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