Unconventional discontinuous transitions in isospin systems
ORAL
Abstract
We analyze the transition into the most favorable ordered state for a system of 2D fermions with spin and valley degrees of freedom. We show that for a range of rotationally invariant dispersions, the ordering transition is highly unconventional: the associated susceptibility diverges (or almost diverges) at the transition, yet immediately below it the system jumps discontinuously into a fully polarized state. Additionally, we consider ordering in a system with full SU(4) symmetry and show that there is a cascade of discontinuous transitions into a set of states, which includes a quarter-metal, a half-metal and a three-quarter meta similar to what is seen in bilayer and tri-layer graphene in displacement field.
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Publication: [1] Z. M. Raines, L. I. Glazman, and A. V. Chubukov, Unconventional Discontinuous Transitions in Isospin Systems, Phys. Rev. Lett. 133, 146501 (2024).<br>[2] Z. M. Raines, L. I. Glazman, and A. V. Chubukov, Unconventional discontinuous transitions in a two-dimensional system with spin and valley degrees of freedom, Phys. Rev. B 110, 155402 (2024).<br>[3] Z. M. Raines and A. V. Chubukov, Two-Dimensional Stoner Transitions beyond Mean-Field, arXiv:2409.18934.
Presenters
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Zachary M Raines
University of Minnesota
Authors
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Zachary M Raines
University of Minnesota
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Leonid I Glazman
Yale University
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Andrey V Chubukov
University of Minnesota