Universität zu Köln

Xian, Lede, Claassen, Martin, Kiese, Dominik ORCID: 0000-0002-9263-8022, Scherer, Michael M., Trebst, Simon, Kennes, Dante M. and Rubio, Angel ORCID: 0000-0003-2060-3151 (2021). Realization of nearly dispersionless bands with strong orbital anisotropy from destructive interference in twisted bilayer MoS2. Nat. Commun., 12 (1). BERLIN: NATURE PORTFOLIO. ISSN 2041-1723

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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 MoS2. We report that, in marked contrast to twisted bilayer graphene, slightly hole-doped MoS2 realizes a strongly asymmetric p(x)-p(y) 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 moire interference. We study the collective behavior of twisted bilayer MoS2 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. Twisted van der Waals systems are known to host flat electronic bands, originating from moire potential. Here, the authors predict from purely geometric considerations a new type of nearly dispersionless bands in twisted bilayer MoS2, resulting from destructive interference between effective lattice hopping matrix elements.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Xian, Lede UNSPECIFIED UNSPECIFIED UNSPECIFIED Claassen, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Kiese, Dominik UNSPECIFIED orcid.org/0000-0002-9263-8022 UNSPECIFIED Scherer, Michael M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Trebst, Simon UNSPECIFIED UNSPECIFIED UNSPECIFIED Kennes, Dante M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rubio, Angel UNSPECIFIED orcid.org/0000-0003-2060-3151 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-597177
DOI:	10.1038/s41467-021-25922-8
Journal or Publication Title:	Nat. Commun.
Volume:	12
Number:	1
Date:	2021
Publisher:	NATURE PORTFOLIO
Place of Publication:	BERLIN
ISSN:	2041-1723
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MAGIC-ANGLE; CORRELATED STATES; SUPERCONDUCTIVITY; INSULATOR Multiple languages Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59717