تقرير
Slow noncollinear Coulomb scattering in the vicinity of the Dirac point in graphene
| العنوان: | Slow noncollinear Coulomb scattering in the vicinity of the Dirac point in graphene |
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| المؤلفون: | König-Otto, J. C., Mittendorff, M., Winzer, T., Kadi, F., Malic, E., Knorr, A., Berger, C., de Heer, W. A., Pashkin, A., Schneider, H., Helm, M., Winnerl, S. |
| سنة النشر: | 2018 |
| المجموعة: | Condensed Matter Physics (Other) |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Physics - Optics |
| الوصف: | The Coulomb scattering dynamics in graphene in energetic proximity to the Dirac point is investigated by polarization resolved pump-probe spectroscopy and microscopic theory. Collinear Coulomb scattering rapidly thermalizes the carrier distribution in k-directions pointing radially away from the Dirac point. Our study reveals, however, that in almost intrinsic graphene full thermalization in all directions relying on noncollinear scattering is much slower. For low photon energies, carrier-optical-phonon processes are strongly suppressed and Coulomb mediated noncollinear scattering is remarkably slow, namely on a ps timescale. This effect is very promising for infrared and THz devices based on hot carrier effects. |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.117.087401 |
| URL الوصول: | http://arxiv.org/abs/1805.01761 |
| رقم الأكسشن: | edsarx.1805.01761 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.117.087401 |
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