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• W3106239041 abstract "Moir'e superlattices are emerging as a new route for engineering strongly correlated electronic states in two-dimensional van der Waals heterostructures, as recently demonstrated in the correlated insulating and superconducting states in magic-angle twisted bilayer graphene and ABC trilayer graphene/boron nitride moir'e superlattices. Transition metal dichalcogenide (TMDC) moir'e heterostructures provide another exciting model system to explore correlated quantum phenomena, with the addition of strong light-matter interactions and large spin-orbital coupling. Here we report the optical detection of strongly correlated phases in semiconducting WSe2/WS2 moir'e superlattices. Our sensitive optical detection technique reveals a Mott insulator state at one hole per superlattice site ({nu} = 1), and surprising insulating phases at fractional filling factors {nu} = 1/3 and 2/3, which we assign to generalized Wigner crystallization on an underlying lattice. Furthermore, the unique spin-valley optical selection rules of TMDC heterostructures allow us to optically create and investigate low-energy spin excited states in the Mott insulator. We reveal an especially slow spin relaxation lifetime of many microseconds in the Mott insulating state, orders-of-magnitude longer than that of charge excitations. Our studies highlight novel correlated physics that can emerge in moir'e superlattices beyond graphene." @default.
• W3106239041 created "2020-11-23" @default.
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• W3106239041 date "2020-03-18" @default.
• W3106239041 modified "2023-10-17" @default.
• W3106239041 title "Mott and generalized Wigner crystal states in WSe2/WS2 moiré superlattices" @default.
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• W3106239041 doi "https://doi.org/10.1038/s41586-020-2092-4" @default.
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