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• W896369156 abstract "We develop tangent space methods for projected entangled-pair states (PEPS) that provide direct access to the low-energy sector of strongly-correlated two-dimensional quantum systems. More specifically, we construct a variational ansatz for elementary excitations on top of PEPS ground states that allows for computing gaps, dispersion relations, and spectral weights directly in the thermodynamic limit. Solving the corresponding variational problem requires the evaluation of momentum transformed two-point and three-point correlation functions on a PEPS background, which we can compute efficiently by using a contraction scheme. As an application we study the spectral properties of the magnons of the Affleck-Kennedy-Lieb-Tasaki model on the square lattice and the anyonic excitations in a perturbed version of Kitaev's toric code." @default.
• W896369156 created "2016-06-24" @default.
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• W896369156 date "2015-11-23" @default.
• W896369156 modified "2023-10-17" @default.
• W896369156 title "Excitations and the tangent space of projected entangled-pair states" @default.
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• W896369156 doi "https://doi.org/10.1103/physrevb.92.201111" @default.
• W896369156 hasPublicationYear "2015" @default.
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