Report
Optical spin orientation and depolarization in Ge
| العنوان: | Optical spin orientation and depolarization in Ge |
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| المؤلفون: | Rinaldi, C., Cantoni, M., Bertacco, R. |
| المصدر: | Phys. Rev. B 90, 161304(R) (2014) |
| سنة النشر: | 2013 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics |
| الوصف: | Optical spin orientation and depolarization phenomena in semiconductors are of overwhelming importance for the development of spin-optoelectronics. In this paper we employ Ge-based spin-photodiodes to investigate the room temperature spectral dependence of optical spin orientation in Germanium, in the range 400-1550 nm, and the photo-carrier spin relaxation phenomena. Apart from the maximum in the spin polarization of photo-carriers for photon energy resonant with the direct gap (1550 nm), we experimentally demonstrate the presence of a second sizable peak at 530 nm due to photo-generation far away from the center of the Brillouin zone, within the L valleys. Furthermore, our data indicate that the equivalent the spin lifetime of holes in Ge is in the order of 5-10 ps, meaning that the spin diffusion length for holes at room temperature is larger than expected, in the order of 150-220 nm. Comment: 12 pages, 5 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.90.161304 |
| URL الوصول: | http://arxiv.org/abs/1302.4675 |
| رقم الانضمام: | edsarx.1302.4675 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.90.161304 |
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