Non-local interactions in transition metal dichalcogenide heterobilayer moiré superlattices
ORAL
Abstract
Moiré superlattices formed in two-dimensional semiconductor heterobilayers provide a new realization of Hubbard-like physics in which the number of charge carriers per effective atom can be tuned through large ranges with electrical gates. Electrons or holes are less strongly attracted to effective lattice sites defined by external potential minima in moiré superlattices than in atomic lattices, because the confining potential is weaker than the attractive potential of positively charged atomic nuclei. As a consequence, non-local interaction terms like interaction-assisted hopping and intersite-exchange have a larger importance in moiré-material generalized Hubbard models. We discuss the influence of this difference on the metal-insulator phase transition and on magnetic insulating states at half-filling, by means of an exact diagonalization study of the electronic properties of narrow moiré bands. We also address the strong particle-hole asymmetry in physical properties as a function of doping relative to half-filling.
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Presenters
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Nicolás Morales-Durán
University of Texas at Austin
Authors
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Nicolás Morales-Durán
University of Texas at Austin
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Pawel Potasz
University of Texas at Austin, Department of Theoretical Physics, Wroclaw University of Science and Technology
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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