Regensburg 2025 – wissenschaftliches Programm

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PLV: Plenarvorträge

PLV XI

PLV XI: Plenarvortrag

Freitag, 21. März 2025, 08:30–09:15, H1

Exploring correlated phases and topology in van der Waals platforms — •Roser Valenti — Institute of Theoretical Physics, Goethe University Frankfurt

In recent years a plethora of new correlated states have been observed by stacking, twisting and straining two dimensional van der Waals materials of different kind. Some prominent examples are twisted bilayer graphene, bilayer heterostructures of graphene with the spin-orbit assisted Mott insulator α-RuCl3 -a candidate for Kitaev spin physics-, or bilayer heterostructures of the Mott insulator 1T-TaS2 with the metal 1H-TaS2. Unique to these bilayer structures is the possible emergence of phases not foreseable from the single layers alone, such as heavy fermions, Kondo insulators, quantum spin liquids, correlated metals, or topological superconductors.

In this talk I will discuss the microscopic modelling of such heterostructures by a combination of first-principles calculations, effective-model considerations, many-body techniques and statistical/ machine learning methods and will present exemplary cases on the emerging correlated electronic and magnetic properties[1-5] and will compare with experimental results.

[1] Rai et al. PRX 14, 031045 (2024)

[2] Crippa et al. Nature Communications 15, 1357 (2024)

[3] Akram et al. Nano Letters 24, 890 (2024)

[4] Hu et al. PRL 131, 166501 (2023)

[5] Yang et al. Nature Materials 22, 50 (2023)

Keywords: correlations; topology; heterostructures; modelling