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Condensed Matter > Strongly Correlated Electrons

arXiv:2407.14583 (cond-mat)
[Submitted on 19 Jul 2024 (v1), last revised 21 Nov 2024 (this version, v2)]

Title:Correlated Topological Mixed-Valence Insulators in Moiré Hetero-Bilayers

Authors:Juan Felipe Mendez-Valderrama, Sunghoon Kim, Debanjan Chowdhury
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Abstract:Moiré transition metal dichalcogenide (TMD) materials provide an ideal playground for studying the combined interplay of strong interactions and band-topology over a range of electronic fillings. Here we investigate the panoply of interaction-induced electronic phases that arise at a total commensurate filling of $\nu_T=2$ in moiré TMD heterobilayers, focusing specifically on their renormalized band-topology. We carry out a comprehensive self-consistent parton mean-field analysis on an interacting mixed-valence Hamiltonian describing AB-stacked MoTe$_2$/WSe$_2$ to highlight different ingredients that arise due to "Mottness", band-flattening, an enhanced excitonic tendency, and band-inversion, leading to correlated topological semi-metals and insulators. We also propose a possible route towards realizing fractionalized insulators with emergent neutral fermionic excitations in this and other closely related platforms.
Comments: Main text: 7 pages, 3 figures, Supplementary information: 3 pages
Subjects: Strongly Correlated Electrons (cond-mat.str-el)
Cite as: arXiv:2407.14583 [cond-mat.str-el]
  (or arXiv:2407.14583v2 [cond-mat.str-el] for this version)
  https://doi.org/10.48550/arXiv.2407.14583
Journal reference: Phys. Rev. B 110, L201105, 2024
Related DOI: https://doi.org/10.1103/PhysRevB.110.L201105

Submission history

From: Juan-Felipe Mendez-Valderrama [view email]
[v1] Fri, 19 Jul 2024 18:00:00 UTC (3,066 KB)
[v2] Thu, 21 Nov 2024 16:02:23 UTC (3,066 KB)
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