A sub-femtojoule electrical spin-switch based on optically trapped polariton condensates
| Autor: | George Deligeorgis, Pavlos G. Savvidis, Yuri G. Rubo, Jeremy J. Baumberg, A. Dreismann, S. I. Tsintzos, Hamid Ohadi, Zacharias Hatzopoulos, Yago del Valle-Inclan Redondo, Ryan Balili |
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| Rok vydání: | 2016 |
| Předmět: |
Photon
Exciton Physics::Optics 02 engineering and technology Electron 01 natural sciences Electric field 0103 physical sciences Polariton General Materials Science 010306 general physics Spin-½ Condensed Matter::Quantum Gases Physics Spintronics Condensed matter physics Spins Condensed Matter::Other business.industry Mechanical Engineering General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Mechanics of Materials Optoelectronics 0210 nano-technology business |
| Zdroj: | Nature Materials. 15:1074-1078 |
| ISSN: | 1476-4660 1476-1122 |
| DOI: | 10.1038/nmat4722 |
| Popis: | The spin-switching of optically induced polariton condensates can be externally controlled with an electric field, with switching energies below 0.5 fJ. Practical challenges to extrapolating Moore’s law favour alternatives to electrons as information carriers. Two promising candidates are spin-based and all-optical architectures, the former offering lower energy consumption1, the latter superior signal transfer down to the level of chip-interconnects2. Polaritons—spinor quasi-particles composed of semiconductor excitons and microcavity photons—directly couple exciton spins and photon polarizations, combining the advantages of both approaches. However, their implementation for spintronics has been hindered because polariton spins can be manipulated only optically3,4 or by strong magnetic fields5,6. Here we use an external electric field to directly control the spin of a polariton condensate, bias-tuning the emission polarization. The nonlinear spin dynamics offers an alternative route to switching, allowing us to realize an electrical spin-switch exhibiting ultralow switching energies below 0.5 fJ. Our results lay the foundation for development of devices based on the electro-optical control of coherent spin ensembles on a chip. |
| Databáze: | OpenAIRE |
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