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Emergent interacting phases in the strong-coupling limit of twisted M-valley moiré systems: Application to SnSe2

Ming-Rui Li1,2, Dumitru Calugaru3, Yi Jiang4, Hanqi Pi4, Ammon Fischer5, Henning Schlömer6,7, Lennart Klebl8, Zhengchao Xia9, Maia G. Vergniory10,4 et al.

Dante M. Kennes5,11,12, Kin Fai Mak9,5, Jie Shan9,5, Siddharth A. Parameswaran3, Hong Yao1, B. Andrei Bernevig2,4,13,*, and Haoyu Hu2,14,†

  • *Contact author: bernevig@princeton.edu
  • †Contact author: hh5463@princeton.edu
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Phys. Rev. B 114, L051113 – Published 31 July, 2026

DOI: https://doi.org/10.1103/htld-vgws

Abstract

We establish twisted SnSe2 as a tunable platform for simulating dimension-dependent correlated physics, distinct from conventional K-valley moiré systems. By constructing interacting Wannier models, we show that the stacking configuration dictates the effective lattice geometry. In AA-stacked bilayers, a momentum-space nonsymmorphic symmetry constrains the single-particle hopping within each valley to be effectively one-dimensional while still allowing fully two-dimensional interactions, thereby giving rise to an effective quasi-one-dimensional system. This dimensional reduction stabilizes exotic phases including dimerized states with finite residual entropy, valence bond solids, and quantum paramagnetism. Conversely, AB stacking maps to a frustrated Kagome lattice; here, strong interactions drive the emergence of a classical spin liquid. The high tunability of this moiré system, which allows control over both the filling and interaction strength (via twist angle), renders twisted SnSe2 a versatile platform for realizing a wide range of exotic correlated quantum phases.

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Phys. Rev. B 114, L051113– Published 31 July, 2026
  • Received 1 September 2025
  • Revised 2 June 2026
  • Accepted 4 June 2026
Article part of CHORUS
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