Large, valley-exclusive Bloch-Siegert shift in monolayer WS[subscript 2]
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Large, valley.pdf
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3.32 MB
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Author(s)
Lui, Chun Hung
Lee, Yi-Hsien
Sie, Edbert Jarvis
Kong, Jing
Gedik, Nuh
Fu, Liang
Alternative Title
Large, valley-exclusive Bloch-Siegert shift in monolayer WS2
Date Issued
March 2017
Journal
Science
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Sie, Edward J. et al. "Large, valley-exclusive Bloch-Siegert shift in monolayer WS[subscript 2]." Science, 355:6329 (2017): 1066-1069.
Version
Original manuscript
Abstract
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 (WS[subscript 2]) 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.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1126/science.aal2241
