期刊
NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41467-021-22412-9
关键词
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资金
- Gordon and Betty Moore Foundation [5722]
- Ernest S. Kuh Endowed Chair Professorship
- Texas AM University
- Governor's University Research Initiative (GURI)
The study reports the first observation of a strong magneto-chiral response to excitons in twisted bilayer tungsten disulfide, providing a new pathway for device applications. The unique ExMCh processes enable active control of magneto-chiral applications in photochemical reactions, asymmetric synthesis, and drug delivery.
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 similar to 4%. We further found the ExMCh anisotropy features with a spectral splitting of similar to 7nm, 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.
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