Observation of strong excitonic magneto-chiral anisotropy in twisted bilayer van der Waals crystals

Shoufeng Lan, Xiaoze Liu, Siqi Wang, Hanyu Zhu, Yawen Liu, Cheng Gong, Sui Yang, Jing Shi, Yuan Wang and Xiang Zhang ()
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Shoufeng Lan: University of California
Xiaoze Liu: University of California
Siqi Wang: University of California
Hanyu Zhu: University of California
Yawen Liu: University of California
Cheng Gong: University of California
Sui Yang: University of California
Jing Shi: University of California
Yuan Wang: University of California
Xiang Zhang: University of California

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract The interplay between chirality and magnetism generates a distinct physical process, the magneto-chiral effect, which enables one to develop functionalities that cannot be achieved solely by any of the two. Such a process is universal with the breaking of parity-inversion and time-reversal symmetry simultaneously. However, the magneto-chiral effect observed so far is weak when the matter responds to photons, electrons, or phonons. Here we report the first observation of strong magneto-chiral response to excitons in a twisted bilayer tungsten disulfide with the amplitude of excitonic magneto-chiral (ExMCh) anisotropy reaches a value of ~4%. We further found the ExMCh anisotropy features with a spectral splitting of ~7 nm, precisely the full-width at half maximum of the excitonic chirality spectrum. Without an externally applied strong magnetic field, the observed ExMCh effect with a spontaneous magnetic moment from the ferromagnetic substrate of thulium iron garnet at room temperature is favorable for device applications. The unique ExMCh processes provide a new pathway to actively control magneto-chiral applications in photochemical reactions, asymmetric synthesis, and drug delivery.

Date: 2021
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DOI: 10.1038/s41467-021-22412-9

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