Excitations and the tangent space of projected entangled-pair states

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 al...

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Veröffentlicht in:	Physical review. B 2015-11, Vol.92 (20), Article 201111
Hauptverfasser:	Vanderstraeten, Laurens, Mariën, Michaël, Verstraete, Frank, Haegeman, Jutho
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter Dispersions Excitation spectra Ground state Low energy Magnons Spectra Tangents
Online-Zugang:	Volltext
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