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Femtosecond transient absorption spectroscopy was applied to map out the electronic transition energies of a selected semiconducting zigzag carbon nanotube, the ͑11,0͒ tube. The experiment was performed by resonant excitation of the lowest electronic transition with spectrally narrow pump pulses, ensuring predominant selection of the desired tube type from(More)
(23) or physical processing can markedly increase the TCR as shown in the annealing experiment (fig. S3). The presence of intertube junctions dramatically decreases the efficiency of heat transport along the SWNT film, thereby thermally insulating the sensitive element from the supporting substrate, which enhances the temperature response (18). Optimization(More)
We report ab initio calculations of quasiparticle lifetimes in graphite, as determined from the imaginary part of the self-energy operator within the GW approximation. The inverse lifetime in the energy range from 0.5 to 3.5 eV above the Fermi level presents significant deviations from the quadratic behavior naively expected from Fermi liquid theory. The(More)
Dynamic wavelength tunability has long been the holy grail of photodetector technology. Because of its atomic thickness and unique properties, graphene opens up new paradigms to realize this concept, but so far this has been elusive experimentally. Here we employ detailed quantum transport modeling of photocurrent in graphene field-effect transistors(More)
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