2008
DOI: 10.1016/j.physleta.2007.11.044
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Low-energy properties of non-perturbative quantum systems: A space reduction approach

Abstract: We propose and test a renormalization procedure which acts in Hilbert space. We test its efficiency on strongly correlated quantum spin systems by working out and analyzing the low-energy spectral properties of frustrated quantum spin systems in different parts of the phase diagram and in the neighbourhood of quantum critical points.

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