S-F Shi

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We investigate the ultrafast terahertz response of electrostatically gated graphene upon optical excitation. We observe that the photoinduced terahertz absorption increases in charge neutral graphene but decreases in highly doped graphene. We show that this transition from semiconductor-like to metal-like response is unique for zero bandgap materials such(More)
We achieve direct electrical readout of the wavelength and polarization dependence of the plasmon resonance in individual gold nanogap antennas by positioning a graphene nanoconstriction within the gap as a localized photodetector. The polarization sensitivities can be as large as 99%, while the plasmon-induced photocurrent enhancement is 2-100. The plasmon(More)
Correlated ultrafast photoconductive and absorptive response in WSe 2 show interlayer charge transfer determines device efficiency " in prep. (2015) " Tunable optical excitations in twisted bilayer graphene form strongly bound excitons " Nano Letters, 15, 5032 (2013) " Transient absorption and photocurrent microscopy show hot electron supercollisions(More)
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