One-Dimensional Electronic Flat Bands in Untwisted Moiré Superlattices.
Sign Up to like & getrecommendations! Published in 2023 at "Advanced materials"
DOI: 10.1002/adma.202300572
Abstract: After the preparation of two-dimensional (2D) electronic flat band (EFB) in van der Waals (vdW) superlattices, recent measurements suggested the existence of one-dimensional (1D) electronic flat bands (1D-EFBs) in twisted vdW bilayers. However, realisation of… read more here.
Keywords: untwisted moir; dimensional electronic; bands untwisted; flat bands ... See more keywords
Character of defect states in vacancy-doped MoTe2 monolayer: Spatial localization, flat bands and hybridization gap
Sign Up to like & getrecommendations! Published in 2019 at "Superlattices and Microstructures"
DOI: 10.1016/j.spmi.2019.04.044
Abstract: Abstract The structural and electronic properties of vacancy-doped 1H and 1T′ MoTe2 monolayers are systematically investigated based on first-principles calculations. Te vacancy is found energetically favored over Mo vacancy for both phases, and Te double… read more here.
Keywords: vacancy doped; defect states; flat bands; vacancy ... See more keywords
Engineering Three-Dimensional Moiré Flat Bands
Sign Up to like & getrecommendations! Published in 2021 at "Nano Letters"
DOI: 10.1021/acs.nanolett.1c01684
Abstract: Twisting two adjacent layers of van der Waals materials with respect to each other can lead to flat two-dimensional electronic bands which enables a wealth of physical phenomena. Here, we generalize this concept of so-called… read more here.
Keywords: three dimensional; engineering three; flat bands; dimensional moir ... See more keywords
Designing Ultra-flat Bands in Twisted Bilayer Materials at Large Twist Angles: Theory and Application to Two-Dimensional Indium Selenide.
Sign Up to like & getrecommendations! Published in 2022 at "Journal of the American Chemical Society"
DOI: 10.1021/jacs.1c11953
Abstract: Intertwisted bilayers of two-dimensional (2D) materials can host low-energy flat bands, which offer opportunity to investigate many intriguing physics associated with strong electron correlations. In the existing systems, ultra-flat bands only emerge at very small… read more here.
Keywords: two dimensional; bilayer; flat bands; twist angles ... See more keywords
Tunable angle-dependent electrochemistry at twisted bilayer graphene with moiré flat bands
Sign Up to like & getrecommendations! Published in 2022 at "Nature Chemistry"
DOI: 10.1038/s41557-021-00865-1
Abstract: Tailoring electron transfer dynamics across solid–liquid interfaces is fundamental to the interconversion of electrical and chemical energy. Stacking atomically thin layers with a small azimuthal misorientation to produce moiré superlattices enables the controlled engineering of… read more here.
Keywords: bilayer graphene; flat bands; angle dependent; moir ... See more keywords
Dirac fermions and flat bands in the ideal kagome metal FeSn
Sign Up to like & getrecommendations! Published in 2019 at "Nature Materials"
DOI: 10.1038/s41563-019-0531-0
Abstract: A kagome lattice of 3 d transition metal ions is a versatile platform for correlated topological phases hosting symmetry-protected electronic excitations and magnetic ground states. However, the paradigmatic states of the idealized two-dimensional kagome lattice—Dirac… read more here.
Keywords: fermions flat; dirac fermions; flat bands; kagome metal ... See more keywords
Chern insulators, van Hove singularities and topological flat bands in magic-angle twisted bilayer graphene
Sign Up to like & getrecommendations! Published in 2021 at "Nature Materials"
DOI: 10.1038/s41563-020-00911-2
Abstract: Magic-angle twisted bilayer graphene exhibits intriguing quantum phase transitions triggered by enhanced electron–electron interactions when its flat bands are partially filled. However, the phases themselves and their connection to the putative non-trivial topology of the… read more here.
Keywords: bilayer graphene; van hove; topology; flat bands ... See more keywords
Imaging moiré flat bands in three-dimensional reconstructed WSe2/WS2 superlattices
Sign Up to like & getrecommendations! Published in 2021 at "Nature Materials"
DOI: 10.1038/s41563-021-00923-6
Abstract: Moiré superlattices in transition metal dichalcogenide (TMD) heterostructures can host novel correlated quantum phenomena due to the interplay of narrow moiré flat bands and strong, long-range Coulomb interactions1–9. However, microscopic knowledge of the atomically reconstructed… read more here.
Keywords: wse2 ws2; flat bands; moir flat; moir ... See more keywords
Flat bands and gaps in twisted double bilayer graphene.
Sign Up to like & getrecommendations! Published in 2020 at "Nanoscale"
DOI: 10.1039/c9nr10830k
Abstract: We present electronic structure calculations of twisted double bilayer graphene (TDBG): a tetralayer graphene structure composed of two AB-stacked graphene bilayers with a relative rotation angle between them. Using first-principles calculations, we find that TDBG… read more here.
Keywords: bilayer graphene; twisted double; graphene; flat bands ... See more keywords
Coupling double flat bands in a quadrangular-star lattice.
Sign Up to like & getrecommendations! Published in 2023 at "Nanoscale"
DOI: 10.1039/d3nr00651d
Abstract: Most special two-dimensional (2D) lattices, such as Kagome and Lieb lattices, can only generate a single flat band. Here, we propose a 2D lattice named a quadrangular-star lattice (QSL). It can produce coupling double flat… read more here.
Keywords: star lattice; quadrangular star; coupling double; double flat ... See more keywords
General bounded corner states in two-dimensional off-diagonal Aubry–André–Harper model with flat bands
Sign Up to like & getrecommendations! Published in 2021 at "New Journal of Physics"
DOI: 10.1088/1367-2630/ac38cc
Abstract: We investigate the general bounded corner states in a two-dimensional off-diagonal Aubry–André–Harper square lattice model supporting flat bands. We show that for certain values of the nearest-neighbor hopping amplitudes, triply degenerate zero-energy flat bands emerge… read more here.
Keywords: flat bands; bounded corner; general bounded; two dimensional ... See more keywords