Universität zu Köln

Wagner, Christopher, Chowdhury, Tathagata ORCID: 0000-0002-0108-9719, Pixley, J. H. and Ingersent, Kevin (2018). Long-Range Entanglement near a Kondo-Destruction Quantum Critical Point. Phys. Rev. Lett., 121 (14). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

The numerical renormalization group is used to study quantum entanglement in the Kondo impurity model with a density of states rho(epsilon) proportional to vertical bar epsilon vertical bar(r) (0 < r < 1/2) that vanishes at the Fermi energy epsilon = 0. This nonintegrable model features a Kondo-destruction quantum critical point (QCP) separating a partially screened phase from a local-moment phase. The impurity contribution S-e(imp) to the entanglement entropy between a region of radius R around the magnetic impurity and the rest of the system reveals a length scale R* that distinguishes a region R << R* of strong critical entanglement from one R>> R* of weak entanglement. Within each phase, S-e(imp) is a universal function of R/R* with a power-law decay for R/R* >> 1. The entanglement length R* diverges on approach to the interacting QCP, showing that the critical Kondo screening cloud subsumes the entire system as the impurity becomes maximally entangled with the conduction band. This work has implications for entanglement calculations in other models and for the nature of heavy-fermion quantum criticality.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wagner, Christopher UNSPECIFIED UNSPECIFIED UNSPECIFIED Chowdhury, Tathagata UNSPECIFIED orcid.org/0000-0002-0108-9719 UNSPECIFIED Pixley, J. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ingersent, Kevin UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-169560
DOI:	10.1103/PhysRevLett.121.147602
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	121
Number:	14
Date:	2018
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RENORMALIZATION-GROUP; PHASE-TRANSITIONS; ANDERSON; IMPURITY; ENTROPY; SYSTEMS; FIELD; MODEL Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16956