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MM: Fachverband Metall- und Materialphysik
MM 13: Phase Transformations I
MM 13.4: Talk
Monday, March 18, 2024, 16:30–16:45, C 230
Phase diagram of the incommensurate magnetic Hubbard model — •Liam Rampon1, Fedor Šimkovic IV3, and Michel Ferrero1,2 — 1CPHT, CNRS, École Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau, France — 2Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France — 3IQM, Nymphenburgerstr. 86, 80636 Munich, Germany
We present the magnetic phase diagram of the cubic Hubbard model at strong coupling. We investigate the onset of spin-spiral orderings as a function of temperature and for dopings up to 20%. By computing relevant thermodynamical potentials, we identify the leading ordering vector and discuss the mechanism that gives rise to the ordered state. We observe manifestations of the Pomeranchuk effect and also show strong evidence for a phase separation at lower temperature and doping, possibly caused by an underlying "stripe" phase. These findings were obtained with single-site dynamical mean-field theory, using a broken-symmetry formalism that allows one to directly stabilize incommesurate spiral orders.
Keywords: Incommensurate magnetism; Dynamical Mean-Field Theory; Hubbard model; Strongly correlated materials