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SUMMARY:A holographic model of the Kondo effect - Erdmenger\, JK (Max-Plan
 ck-Institut fr Physik\, Mnchen)
DTSTART:20130920T130000Z
DTEND:20130920T134500Z
UID:TALK47294@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Coauthors: C. Hoyos (Tel Aviv Univ.)\, A. O'Bannon (DAMTP Camb
 ridge)\, J. Wu (NCTS Taiwan)\n\nWe propose a holographic model of the Kond
 o effect\, i.e. of the screening of a magnetic impurity coupled to a bath 
 of conduction electrons at low temperatures. In a (1+1)-dimensional CFT de
 scription\, this corresponds to an RG flow from an UV to an IR fixed point
  triggered by a marginally relevant (0+1)-dimensional operator. In the lar
 ge N limit\, with spin SU(N) and charge U(1) symmetries\, the Kondo effect
  appears as a mean-field phase transition in which the U(1) symmetry is sp
 ontaneously broken. Inspired by a top-down brane model\, we model the Kond
 o RG flow by an AdS_3 Chern-Simons action coupled to an AdS_2 holographic 
 superconductor. We observe several characteristic features of the Kondo ef
 fect in this model\, such as dynamical scale generation and a phase shift.
  Moreover\, we find a power-law behaviour of the resistivity with temperat
 ure which is consistent with over-screening. Our model may serve as a basi
 s for investigating more involved problems such as Kondo lattices.\n
LOCATION:Seminar Room 1\, Newton Institute
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