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Entanglement struct...
Entanglement structure of the two-channel Kondo model
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Alkurtass, B. (författare)
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Bayat, A. (författare)
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Affleck, I. (författare)
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Bose, S. (författare)
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- Johannesson, Henrik, 1953 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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Sodano, P. (författare)
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Sorensen, E. S. (författare)
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Le Hur, K. (författare)
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(creator_code:org_t)
- 2016
- 2016
- Engelska.
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Ingår i: Physical Review B. - 2469-9950. ; 93:8
- Relaterad länk:
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https://gup.ub.gu.se...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Two electronic channels competing to screen a single impurity spin, as in the two-channel Kondo model, are expected to generate a ground state with a nontrivial entanglement structure. We exploit a spin-chain representation of the two-channel Kondo model to probe the ground-state block entropy, negativity, tangle, and Schmidt gap, using a density matrix renormalization group approach. In the presence of symmetric coupling to the two channels, we confirm field-theory predictions for the boundary entropy difference ln(g(UV)/g(IR)) = ln(2)/2 between the ultraviolet and infrared limits and the leading ln(x)/x impurity correction to the block entropy. The impurity entanglement S-imp is shown to scale with the characteristic length xi(2CK). We show that both the Schmidt gap and the entanglement of the impurity with one of the channels-as measured by the negativity-faithfully serve as order parameters for the impurity quantum phase transition appearing as a function of channel asymmetry, allowing for explicit determination of critical exponents, nu approximate to 2 and beta approximate to 0.2. Remarkably, we find the emergence of tripartite entanglement only in the vicinity of the critical channel-symmetric point.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- conformal-field-theory
- non-fermi-liquid
- quantum criticality
- behavior
- crossover
- impurity
- systems
- temperature
- environment
- anisotropy
- Physics
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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