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X-ORIGINAL-URL:https://www.lps.u-psud.fr/
X-WR-CALNAME:Laboratoire de physique des Solides
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DTSTART;TZID=Europe/Paris:20260122T110000
DTEND;TZID=Europe/Paris:20260122T180000
DTSTAMP:20260108T093500
UID:MEC-2f73168bf3656f697507752ec592c437@lps.u-psud.fr
CREATED:20260108
LAST-MODIFIED:20260108
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:Charlotte Beneke : Spin and charge criticality in the (pseudogap) two-impurity Anderson model
DESCRIPTION:\nThe Kondo effect originates from spin screening of localized impurities by conduction electrons. This Kondo screening can be suppressed by a fermionic bath following a pseudogap (i.e. power-law) density of states, by inter-impurity interactions, or by coupling to multiple conduction channels.We investigate the two-impurity Anderson model in various limits, and establish mappings to known Kondo and Anderson models. This leads to rich phase diagrams with Kondo-breakdown transitions of distinct universality classes giving rise to non-Fermi-liquid behavior. We analyze the phase diagram, and critical exponents of the pseudogap two-impurity Anderson model in the particle-hole symmetric, SU(2)-invariant case using perturbative renormalization-group techniques. We recover the transitions of the pseudogap single-impurity Anderson model, and find additional Kondo-breakdown quantum transitions to inter-impurity singlet-, triplet- and new charge-ordered phases. At the quantum critical points, superconducting-pairing susceptibilities can be enhanced depending on the type of spin- and charge criticality.We discuss connections to heavy-fermion systems and two-quantum-dot realizations where quantum dots act as tunable magnetic impurities.\n
URL:https://www.lps.u-psud.fr/events/charlotte-beneke-spin-and-charge-criticality-in-the-pseudogap-two-impurity-anderson-model/
ORGANIZER;CN=Andrej Meszaros:MAILTO:
CATEGORIES:Séminaire de la Théorie de la Matière Condensée,Séminaires
LOCATION:Moyen amphi (LPS) + ONLINE (Zoom)
ATTACH;FMTTYPE=image/jpeg:https://www.lps.u-psud.fr/wp-content/uploads/2026/01/ed74b4db-cb27-45eb-a83c-f69dcccf680a.jpeg
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