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- W2065201984 abstract "For quantum lattice systems with local interactions, the Lieb-Robinson bound acts as an alternative for the strict causality of relativistic systems and allows to prove many interesting results, in particular when the energy spectrum exhibits an energy gap. In this Letter, we show that for translation invariant systems, simultaneous eigenstates of energy and momentum with an eigenvalue that is separated from the rest of the spectrum in that momentum sector, can be arbitrarily well approximated by building a momentum superposition of a local operator acting on the ground state. The error decreases in the size of the support of the local operator, with a rate that is set by the gap below and above the targeted eigenvalue. We show this explicitly for the AKLT model and discuss generalizations and applications of our result." @default.
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- W2065201984 date "2013-08-19" @default.
- W2065201984 modified "2023-10-11" @default.
- W2065201984 title "Elementary Excitations in Gapped Quantum Spin Systems" @default.
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- W2065201984 doi "https://doi.org/10.1103/physrevlett.111.080401" @default.
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