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• W3100443100 abstract "We revisit the conserved quantities of the spin-1/2 XY model with open boundary conditions. In the absence of a transverse field, we find new families of local charges and show that half of the seeming conservation laws are conserved only if the number of sites is odd. In even chains the set of noninteracting charges is abelian, like in the periodic case when the number of sites is odd. In odd chains the set is doubled and becomes non-abelian, like in even periodic chains. The dependence of the charges on the parity of the chain's size undermines the common belief that the thermodynamic limit of diagonal ensembles exists. We consider also the transverse-field Ising chain, where the situation is more ordinary. The generalization to the XY model in a transverse field is not straightforward and we propose a general framework to carry out similar calculations. We conjecture the form of the bulk part of the local charges and discuss the emergence of quasilocal conserved quantities. We provide evidence that in a region of the parameter space there is a reduction of the number of quasilocal conservation laws invariant under chain inversion. As a by-product, we study a class of block-Toeplitz-plus-Hankel operators and identify the conditions that their symbols satisfy in order to commute with a given block-Toeplitz." @default.
• W3100443100 created "2020-11-23" @default.
• W3100443100 creator A5051513493 @default.
• W3100443100 date "2016-06-21" @default.
• W3100443100 modified "2023-10-13" @default.
• W3100443100 title "Local conservation laws in spin-$frac{1}{2}$ XY chains with open boundary conditions" @default.
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• W3100443100 doi "https://doi.org/10.1088/1742-5468/2016/06/063105" @default.
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