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          Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 716450.0, MPI für Physik / YB 2016
Entanglement Entropy in a Holographic Kondo Model
Authors:Erdmenger, Johanna; Flory, Mario; Hoyos, Carlos; Newrzella, Max-Niklas; Wu, Jackson
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Fortschritte der Physik/Progress of Physics
Journal Abbrev.:Fortschr.Phys.
Issue / Number:64
Start Page:109
End Page:130
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We calculate entanglement and impurity entropies in a recent holographic model of a magnetic impurity interacting with a strongly coupled system. There is an RG flow to an IR fixed point where the impurity is screened, leading to a decrease in impurity degrees of freedom. This information loss corresponds to a volume decrease in our dual gravity model, which consists of a codimension one hypersurface embedded in a BTZ black hole background in three dimensions. There are matter fields defined on this hypersurface which are dual to Kondo field theory operators. In the large N limit, the formation of the Kondo cloud corresponds to the condensation of a scalar field. The entropy is calculated according to the Ryu-Takayanagi prescription. This requires to determine the backreaction of the hypersurface on the BTZ geometry, which is achieved by solving the Israel junction conditions. We find that the larger the scalar condensate gets, the more the volume of constant time slices in the bulk is reduced, shortening the bulk geodesics and reducing the impurity entropy. This provides a new non-trivial example of an RG flow satisfying the g-theorem. Moreover, we find explicit expressions for the impurity entropy which are in agreement with previous field theory results for free electrons. This demonstrates the universality of perturbing about an IR fixed point.
Classification / Thesaurus:Theoretical Physics
Comment of the Author/Creator:26 pages + appendices, 10 figures
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
Affiliations:MPI für Physik
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