Dresden 2026 – scientific programme
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DS: Fachverband Dünne Schichten
DS 5: Focus Session: Tunable Correlations in van der Waals Quantum Materials II (joint session TT/DS/HL)
DS 5.2: Talk
Tuesday, March 10, 2026, 10:00–10:15, HSZ/0105
Engineering Hubbard models with gated two-dimensional moiré systems — •Yiqi Yang1, Yubo Yang2, Miguel Morales3, and Shiwei Zhang3 — 1Lund University, Lund, Sweden — 2Hofstra University, New York, USA — 3Flatiron Institute, New York, USA
Lattice models are powerful tools for studying strongly correlated quantum many-body systems, but their general lack of exact solutions motivates efforts to simulate them in tunable platforms. Recently, a promising new candidate has emerged for such platforms from two-dimensional materials. A subset of moiré systems can be effectively described as a two-dimensional electron gas (2D EG) subject to a moiré potential, with electron-electron interactions screened by nearby metallic gates. In this talk, we present the realization of lattice models in such systems [1]. We show that, by controlling the gate separation, a 2D EG in a square moiré potential can be systematically tuned into a system whose ground state exhibits orders analogous to those of the square lattice Hubbard model, including the stripe phase. Furthermore, we study how variations in gate separation and moiré potential depth affect the ground-state orders. A number of antiferromagnetic phases, as well as a ferromagnetic phase and a paramagnetic phase, are identified.We then apply our quantitative downfolding approach to triangular moiré systems closer to current experimental conditions, compare them with the square lattice parameters studied, and outline routes for experimental realization of the phases.
[1] arXiv:2508.13314
Keywords: Twistronics; Quantum many-body systems; Two-dimensional electron gas; Hubbard model; Density functional theory