Entanglement entropy of low-lying excitation in localized interacting system: Signature of Fock space delocalization

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Abstract

The properties of the entanglement entropy (EE) of low-lying excitations in one-dimensional disordered interacting systems are studied. The ground state EE shows a clear signature of localization, while low-lying excitations show a significantly longer localization length. The dependence of the localization as a function of interaction strength and sample length is studied using the density matrix renormalization group (DMRG). This behavior corresponds to the presence of the predicted many-particle critical energy in the vicinity of the ground state energy. The implications of these results on experiments are discussed.

Original languageEnglish
Article number205137
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number20
DOIs
StatePublished - 30 May 2014

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