Tunable exciton valley-pseudospin orders in moiré superlattices

Richen Xiong, Samuel L. Brantly, Kaixiang Su, Jacob H. Nie, Zihan Zhang, Rounak Banerjee, Hayley Ruddick, Kenji Watanabe, Takashi Taniguchi, Seth Ariel Tongay, Cenke Xu and Chenhao Jin ()
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Richen Xiong: University of California at Santa Barbara
Samuel L. Brantly: University of California at Santa Barbara
Kaixiang Su: University of California at Santa Barbara
Jacob H. Nie: University of California at Santa Barbara
Zihan Zhang: University of California at Santa Barbara
Rounak Banerjee: Arizona State University
Hayley Ruddick: Arizona State University
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Seth Ariel Tongay: Arizona State University
Cenke Xu: University of California at Santa Barbara
Chenhao Jin: University of California at Santa Barbara

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Excitons in two-dimensional (2D) semiconductors have offered an attractive platform for optoelectronic and valleytronic devices. Further realizations of correlated phases of excitons promise device concepts not possible in the single particle picture. Here we report tunable exciton “spin” orders in WSe2/WS2 moiré superlattices. We find evidence of an in-plane (xy) order of exciton “spin”—here, valley pseudospin—around exciton filling vex = 1, which strongly suppresses the out-of-plane “spin” polarization. Upon increasing vex or applying a small magnetic field of ~10 mT, it transitions into an out-of-plane ferromagnetic (FM-z) spin order that spontaneously enhances the “spin” polarization, i.e., the circular helicity of emission light is higher than the excitation. The phase diagram is qualitatively captured by a spin-1/2 Bose–Hubbard model and is distinct from the fermion case. Our study paves the way for engineering exotic phases of matter from correlated spinor bosons, opening the door to a host of unconventional quantum devices.

Date: 2024
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DOI: 10.1038/s41467-024-48725-z

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