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.
Erdmenger, Johanna
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Hoyos, Carlos
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O'Bannon, Andrew
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Papadimitriou, Ioannis
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Probst, Jonas
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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).
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.
Text
Holographic Kondo and Fano Resonances
- Accepted Manuscript
More information
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
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Date deposited: 06 Sep 2017 16:31
Last modified: 15 Mar 2024 15:53
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Contributors
Author:
Johanna Erdmenger
Author:
Carlos Hoyos
Author:
Ioannis Papadimitriou
Author:
Jonas Probst
Author:
Jackson M.S. Wu
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