Spin transport of a doped Mott insulator in moiré heterostructures

Emma C. Regan, Zheyu Lu, Danqing Wang, Yang Zhang, Trithep Devakul, Jacob H. Nie, Zuocheng Zhang, Wenyu Zhao, Kenji Watanabe, Takashi Taniguchi, Sefaattin Tongay, Alex Zettl, Liang Fu () and Feng Wang ()
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Emma C. Regan: University of California at Berkeley
Zheyu Lu: University of California at Berkeley
Danqing Wang: University of California at Berkeley
Yang Zhang: Massachusetts Institute of Technology
Trithep Devakul: Massachusetts Institute of Technology
Jacob H. Nie: University of California at Santa Barbara
Zuocheng Zhang: University of California at Berkeley
Wenyu Zhao: University of California at Berkeley
Kenji Watanabe: 1-1 Namiki
Takashi Taniguchi: 1-1 Namiki
Sefaattin Tongay: Arizona State University
Alex Zettl: University of California at Berkeley
Liang Fu: Massachusetts Institute of Technology
Feng Wang: University of California at Berkeley

Nature Communications, 2024, vol. 15, issue 1, 1-6

Abstract: Abstract Moiré superlattices of semiconducting transition metal dichalcogenide heterobilayers are model systems for investigating strongly correlated electronic phenomena. Specifically, WSe2/WS2 moiré superlattices have emerged as a quantum simulator for the two-dimensional extended Hubbard model. Experimental studies of charge transport have revealed correlated Mott insulator and generalized Wigner crystal states, but spin transport of the moiré heterostructure has not yet been sufficiently explored. Here, we use spatially and temporally resolved circular dichroism spectroscopy to directly image the spin transport as a function of carrier doping and temperature in WSe2/WS2 moiré heterostructures. We observe diffusive spin transport at all hole concentrations at 11 Kelvin — including the Mott insulator at one hole per moiré unit cell — where charge transport is strongly suppressed. At elevated temperatures the spin diffusion constant remains unchanged in the Mott insulator state, but it increases significantly at finite doping away from the Mott state. The doping- and temperature-dependent spin transport can be qualitatively understood using a t–J model, where spins can move via the hopping of spin-carrying charges and via the exchange interaction.

Date: 2024
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DOI: 10.1038/s41467-024-54633-z

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