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https://researchconnect.buffalo.edu/en/publications/graphene-vertical-cascade-interband-terahertz-and-infrared-photod/ Graphene vertical cascade interband terahertz and infrared photodetectors - SUNY University at... graphene vertical cascade terahertz https://vasp.at/forum/viewtopic.php?t=20328 Dipole matrix elements and interband polarization - VASP Forum dipole matrix elements polarization vasp