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When illuminated by white light, atoms, molecules, and materials absorb only certain characteristic energy contributions based on their absorption properties. Here, we show that this effect can be translated from energy to space: a spatially uniform laser pulse can create strongly localized carrier excitations, including excitons, and spatial charge separation on the sub-nanometer scale within a few femtoseconds, opening new avenues for nanoelectronics and bringing petahertz switching within reach. Using nonequilibrium Green functions simulations we demonstrate this effect by exciting targeted areas of small graphene nanoribbon heterostructures by careful choice of the laser energy and polarization.
Comment: 6 pages, 4 figures |
