Journal
SCIENCE
Volume 355, Issue 6329, Pages 1066-1069Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aal2241
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Funding
- U.S. Department of Energy, BES DMSE
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF4540]
- NSF Science and Technology Center for Integrated Quantum Materials [DMR-1231319]
- Asian Office of Aerospace Research and Development/Office of Naval Research Global grant [FA2386-16-1-4009]
- Ministry of Science and Technology, Taiwan [105-2112-M-007-032-MY3, 105-2119-M-007-027]
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Coherent interaction with off-resonance light can be used to shift the energy levels of atoms, molecules, and solids. The dominant effect is the optical Stark shift, but there is an additional contribution from the so-called Bloch-Siegert shift that has eluded direct and exclusive observation in solids. We observed an exceptionally large Bloch-Siegert shift in monolayer tungsten disulfide (WS2) under infrared optical driving. By controlling the light helicity, we could confine the Bloch-Siegert shift to occur only at one valley, and the optical Stark shift at the other valley, because the two effects obey opposite selection rules at different valleys. Such a large and valley-exclusive Bloch-Siegert shift allows for enhanced control over the valleytronic properties of two-dimensional materials.
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