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(a) SEM image of two-ply MWNT yarn obtained by overtwisting singles yarn. (b) SEM image of a single yarn surface at higher magnification. One can observe MWNTs aligned along the yarn axis.
(a) Schematic presentation of the measured sample, which contains seven two-ply, 12 mm long parallel MWNT yarns placed on a glass substrate between two electrodes. (b) Experimental setup. The sample was attached to the rotating stage that allows us to control the incidence and azimuth angles of the laser beam with respect to the sample surface.
The dependence of generated dc pulse amplitude on (a) incidence angle and (b) on azimuth angle, measured at and , respectively, at the laser pulse energy of 18 mJ. The experimental points are shown by open circles; dashed lines correspond to (a) and (b) .
Band structure of graphene in the vicinity of point. Energy and momentum conservation imply that absorption of two photons of the same energy and momentum creates two electrons in the conduction band with different momenta, i.e., light-induced interband transitions produce electric current due to dragging of charge carriers by photons.
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