Êtes-vous un étudiant de l'EPFL à la recherche d'un projet de semestre?
Travaillez avec nous sur des projets en science des données et en visualisation, et déployez votre projet sous forme d'application sur Graph Search.
Motivated by the recently observed intriguing mode splittings in a magnetic field with inelastic neutron scattering in the spin ladder compound (C5H12N)(2) CuBr4 (BPCB), we investigate the nature of the spin ladder excitations using a density matrix renormalization group and analytical arguments. Starting from the fully frustrated ladder, for which we derive the low-energy spectrum, we show that bound states are generically present close to k = 0 in the dynamical structure factor of spin ladders above H-c1, and that they are characterized by a field-independent binding energy and an intensity that grows with H - H-c1. These predictions are shown to explain quantitatively the split modes observed in BPCB.
Dirk Grundler, Benedetta Flebus
Frédéric Mila, Bruce Normand, Philippe Heller, Nicolas Laflorencie