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Optically Induced Electric Fields Brighten Dark Excitons in Bilayer WSe2
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DOI：10.1021/acsphotonics.6c00562.png)
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Abstract
En 中文
Long-lived dark excitons possess nonzero out-of-plane dipole moments, which facilitate both the study of quantum physics and potential applications in information processing and on-chip communication. However, the weak emission of dark excitons hampers the degree of tunability and practical applications due to selection rules based on electric dipole approximations. Here, we demonstrate an extraordinary enhancement (>32-fold) of momentum-dark exciton (XD) emission in bilayer WSe2, driven by the photoinduced vertical electric field (EZ). The photoinduced electric field highly depends on the geometric structures of holes, reaching a maximum at a diameter of ∼3.44 μm. Additionally, the external electric fields are utilized to control XD’s emission. A multimode optoelectronic logic gate is further demonstrated based on the highly tunable XD. Our findings provide new insights into the tunability of dark excitons, with potential implications for both fundamental physics and future optoelectronic devices.
Keywords:
momentum-dark exciton
freestanding bilayer WSe2
photoinduced vertical electric field
exciton diffusion
many-body interactions
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