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Realization of nearly dispersionless bands with strong orbital anisotropy from destructive interference in twisted bilayer MoS 2 .

Authors :
Xian L
Claassen M
Kiese D
Scherer MM
Trebst S
Kennes DM
Rubio A
Source :
Nature communications [Nat Commun] 2021 Sep 24; Vol. 12 (1), pp. 5644. Date of Electronic Publication: 2021 Sep 24.
Publication Year :
2021

Abstract

Recently, the twist angle between adjacent sheets of stacked van der Waals materials emerged as a new knob to engineer correlated states of matter in two-dimensional heterostructures in a controlled manner, giving rise to emergent phenomena such as superconductivity or correlated insulating states. Here, we use an ab initio based approach to characterize the electronic properties of twisted bilayer MoS <subscript>2</subscript> . We report that, in marked contrast to twisted bilayer graphene, slightly hole-doped MoS <subscript>2</subscript> realizes a strongly asymmetric p <subscript>x</subscript> -p <subscript>y</subscript> Hubbard model on the honeycomb lattice, with two almost entirely dispersionless bands emerging due to destructive interference. The origin of these dispersionless bands, is similar to that of the flat bands in the prototypical Lieb or Kagome lattices and co-exists with the general band flattening at small twist angle due to the moiré interference. We study the collective behavior of twisted bilayer MoS <subscript>2</subscript> in the presence of interactions, and characterize an array of different magnetic and orbitally-ordered correlated phases, which may be susceptible to quantum fluctuations giving rise to exotic, purely quantum, states of matter.<br /> (© 2021. The Author(s).)

Details

Language :
English
ISSN :
2041-1723
Volume :
12
Issue :
1
Database :
MEDLINE
Journal :
Nature communications
Publication Type :
Academic Journal
Accession number :
34561454
Full Text :
https://doi.org/10.1038/s41467-021-25922-8