Floquet engineering of lattice structure and dimensionality in twisted moir\'e heterobilayers

• URL: http://arxiv.org/abs/2103.09874v2
• Date: Fri, 23 Jul 2021 15:13:09 GMT
• Title: Floquet engineering of lattice structure and dimensionality in twisted moir\'e heterobilayers
• Authors: Rong-Chun Ge, Michael Kolodrubetz
• Abstract summary: We show that elliptically polarized light with sub-terahertz frequencies $hbaromegasim 1$ meV and moderate electric fields $Esim0.2$MV/cm allows tuning between the native triangular lattice and a square lattice. Without drive, these twisted TMDs simulate the single band Fermi-Hubbard model; we show that this approximation still holds in the presence of drive.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present an experimental proposal to tune the effective lattice structure in twisted transition metal dichalcogenide (TMD) heterobilayers with time-periodic Floquet drive. We show that elliptically polarized light with sub-terahertz frequencies $\hbar\omega\sim 1$ meV and moderate electric fields $E\sim0.2$~MV/cm allows tuning between the native triangular lattice and a square lattice, while linearly polarized light enables dimensional reduction to a quasi-one-dimensional geometry. Without drive, these twisted TMDs simulate the single band Fermi-Hubbard model; we show that this approximation still holds in the presence of drive. This control opens the door to explore a rich variety of correlated phases of matter, such as spin liquids and d-wave superconductivity.

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