Large, valley-exclusive Bloch-Siegert shift in monolayer WS[subscript 2]
Author(s)
Lui, Chun Hung; Lee, Yi-Hsien; Sie, Edbert Jarvis; Kong, Jing; Gedik, Nuh; Fu, Liang; ... Show more Show less
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Alternative title
Large, valley-exclusive Bloch-Siegert shift in monolayer WS2
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Show full item recordAbstract
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.
Date issued
2017-03Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of PhysicsJournal
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
ISSN
0036-8075
1095-9203