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Holographic Kondo and Fano resonances

Holographic Kondo and Fano resonances
Holographic Kondo and Fano resonances
We use holography to study a (1+1)-dimensional conformal field theory (CFT) coupled to an impurity. The CFT is an SU(N) gauge theory at large N, with strong gauge interactions. The impurity is an SU(N) spin. We trigger an impurity renormalization group (RG) flow via a Kondo coupling. The Kondo effect occurs only below the critical temperature of a large-N mean-field transition. We show that at all temperatures T, impurity spectral functions exhibit a Fano resonance, which in the low-T phase is a large-N manifestation of the Kondo resonance. We thus provide an example in which the Kondo resonance survives strong correlations, and uncover a novel mechanism for generating Fano resonances, via RG flows between (0+1)-dimensional fixed points.
2470-0010
Erdmenger, Johanna
a6829342-7960-44ea-b502-fe531cde3f33
Hoyos, Carlos
65bc37c2-67c7-44f0-8160-3cb7461adff6
O'Bannon, Andrew
f0c14b6c-5b74-4319-8432-f9eba1e20cf3
Papadimitriou, Ioannis
61aeb3c8-7ab7-44db-a3ee-846392b997ba
Probst, Jonas
79a41e05-0c37-4efd-844d-cda7815aa622
Wu, Jackson M.S.
824868eb-0ba0-42a7-ae9f-d340c98c0e32
Erdmenger, Johanna
a6829342-7960-44ea-b502-fe531cde3f33
Hoyos, Carlos
65bc37c2-67c7-44f0-8160-3cb7461adff6
O'Bannon, Andrew
f0c14b6c-5b74-4319-8432-f9eba1e20cf3
Papadimitriou, Ioannis
61aeb3c8-7ab7-44db-a3ee-846392b997ba
Probst, Jonas
79a41e05-0c37-4efd-844d-cda7815aa622
Wu, Jackson M.S.
824868eb-0ba0-42a7-ae9f-d340c98c0e32

Erdmenger, Johanna, Hoyos, Carlos, O'Bannon, Andrew, Papadimitriou, Ioannis, Probst, Jonas and Wu, Jackson M.S. (2017) Holographic Kondo and Fano resonances. Physical Review D, 96 (2), [021901]. (doi:10.1103/PhysRevD.96.021901).

Record type: Article

Abstract

We use holography to study a (1+1)-dimensional conformal field theory (CFT) coupled to an impurity. The CFT is an SU(N) gauge theory at large N, with strong gauge interactions. The impurity is an SU(N) spin. We trigger an impurity renormalization group (RG) flow via a Kondo coupling. The Kondo effect occurs only below the critical temperature of a large-N mean-field transition. We show that at all temperatures T, impurity spectral functions exhibit a Fano resonance, which in the low-T phase is a large-N manifestation of the Kondo resonance. We thus provide an example in which the Kondo resonance survives strong correlations, and uncover a novel mechanism for generating Fano resonances, via RG flows between (0+1)-dimensional fixed points.

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Holographic Kondo and Fano Resonances - Accepted Manuscript
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Accepted/In Press date: 3 July 2017
e-pub ahead of print date: 12 July 2017

Identifiers

Local EPrints ID: 413789
URI: http://eprints.soton.ac.uk/id/eprint/413789
ISSN: 2470-0010
PURE UUID: d247f816-a235-4bf6-b266-ad063cf46885
ORCID for Andrew O'Bannon: ORCID iD orcid.org/0000-0001-7862-783X

Catalogue record

Date deposited: 06 Sep 2017 16:31
Last modified: 22 Nov 2021 03:09

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Contributors

Author: Johanna Erdmenger
Author: Carlos Hoyos
Author: Andrew O'Bannon ORCID iD
Author: Ioannis Papadimitriou
Author: Jonas Probst
Author: Jackson M.S. Wu

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