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Condensed Matter > Mesoscale and Nanoscale Physics
Title: Symmetry breaking in zero-field two-dimensional electron bilayers
(Submitted on 17 Dec 2023 (v1), last revised 27 Mar 2024 (this version, v2))
Abstract: We theoretically consider bilayers of two dimensional (2D) electron gases as in semiconductor quantum wells, and investigate possible spontaneous symmetry breaking transitions at low carrier densities driven by interlayer Coulomb interactions. We use a self-consistent technique implementing mean field truncations of the interacting four-fermion terms, and find a U(1) layer symmetry breaking transition at low carrier densities where the individual layer identities are lost leading to an effective pseudospin XY ferromagnet in the 2D plane. Our results validate earlier theoretical works using simpler restricted Hartree-Fock techniques, and establish the pseudospin XY ferromagnet as a possible low-density symmetry broken phase of 2D bilayers.
Submission history
From: Tessa Cookmeyer [view email][v1] Sun, 17 Dec 2023 18:38:11 GMT (337kb,D)
[v2] Wed, 27 Mar 2024 18:34:14 GMT (431kb,D)
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