The impact of nitrogen doping on the linear and nonlinear terahertz response of graphene
| Autor: | Eugene Zaremba, Roozbeh Anvari, Marc M. Dignam |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Work (thermodynamics)
Materials science Terahertz radiation chemistry.chemical_element FOS: Physical sciences Physics::Optics 02 engineering and technology 01 natural sciences law.invention Condensed Matter::Materials Science Impurity law Condensed Matter::Superconductivity 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Physics::Chemical Physics 010306 general physics Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Graphene Condensed Matter::Other Doping 021001 nanoscience & nanotechnology Nitrogen Nonlinear system Dipole chemistry 0210 nano-technology |
| Popis: | It is well known that impurities play a central role in the linear and nonlinear response of graphene at optical and terahertz frequencies. In this work, we calculate the bands and intraband dipole connection elements for nitrogen-doped monolayer graphene using a density functional tight binding approach. Employing these results, we calculate the linear and nonlinear response of the doped graphene to terahertz pulses using a density-matrix approach in the length gauge. We present the results for the linear and nonlinear mobility as well as third harmonic generation in graphene for adsorbed and substitutional nitrogen doping for a variety of doping densities. We show that the conduction bands are more parabolic in graphene structures with substitutional nitrogen doping than for those with adsorbed nitrogen. As a result, substitutional doping has a greater impact on the terahertz mobility and nonlinear response of graphene than adsorbed nitrogen does. 16 pages, 9 figures |
| Databáze: | OpenAIRE |
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