Γ-Valley Transition-Metal-Dichalcogenide Moirè Bands
ORAL
Abstract
The valence band maxima of most group-VI transition metal dichalcogenide thin films remain at the Γ-point all the way from bulk to bilayer. In this talk, I will describe a recently developed continuum theory of the moirè minibands that are formed in the valence bands of Γ-valley homobilayers by a small relative twist. Our effective theory is benchmarked against large-scale ab initio electronic structure calculations that account for lattice relaxation. As a consequence of an emergent D_6 symmetry we find that low-energy Γ-valley moirè holes differ qualitatively from their K-valley counterparts addressed previously; in energetic order the first three bands realize i) a single-orbital model on a honeycomb lattice, ii) a two-orbital model on a honeycomb lattice, and iii) a single-orbital model on a kagome lattice
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Presenters
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Mattia Angeli
SISSA
Authors
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Mattia Angeli
SISSA
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Allan MacDonald
Physics, University of Texas at Austin, Physics Department, University of Texas at Austin, University of Texas at Austin, Department of physics, University of Texas at Austin, Department of Physics, University of Texas at Austin, University of Texas, Austin