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Caltech Authors (147.820 recursos)

Repository of works by Caltech published authors.

Group = Institute for Quantum Information

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  1. Elementary Excitations in Gapped Quantum Spin Systems

    Haegeman, Jutho; Michalakis, Spyridon; Nachtergaele, Bruno; Osborne, Tobias J.; Schuch, Norbert; Verstraete, Frank
    For quantum lattice systems with local interactions, the Lieb-Robinson bound serves as an alternative for the strict causality of relativistic systems and allows the proof of 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 satisfies an exponential bound in the size of...
    (application/pdf; application/pdf) - 12-oct-2013

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