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Ground-state phases of the one-dimensional SU(N)-symmetric Kondo lattice model. – (Keisuke Totsuka / LPT / Seminar). – 12/03/2024, 11 H.

12 March; 14h00 - 16h00

Keisuke Totsuka (YITP, Kyoto)

Seminar LPT, 12/03/2024, 11H, 3R4, Conference hall

The Kondo-lattice model and its variants (e.g., the Kondo-Heisenberg model), in which itinerant fermions interact with immobile magnetic moments via spin-exchange coupling (Kondo coupling), have been playing an important role in understanding the physics of heavy-fermion systems. In this talk, I begin by quickly explaining how the SU(N) Kondo-lattice model, in which the spin SU(2) symmetry is generalized to SU(N), is realized in actual physical systems (e.g., cold fermions and twisted bilayer graphene), and then I focus on the ground-state properties of its one-dimensional version. Specifically, when the Kondo coupling is sufficiently large, we find ferromagnetic metallic phases that can be established rigorously as well as several insulating ones. I also show that the SU(N) Kondo-lattice model provides a natural condensed-matter realization of supersymmetric [i.e., SU(N|1)] models. Various (insulating) phases at small Kondo coupling are then explored using the machinery of bosonization and various conformal field theory (CFT) techniques, and the results are compared with the predictions of the Lieb-Schultz-Mattis-type (or anomaly-matching) argument.



12 March
14h00 - 16h00
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salle de séminaire 3ème étage
Bâtiment 3r1 Université Toulouse III
Toulouse, 31400 France
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