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I became fascinated with spintronics for about a year. Somewhat unrelated, but perhaps interesting to some readers, is that you can create spin-LEDs. If you use
by mojomark 6y ago
I became fascinated with spintronics for about a year. Somewhat unrelated, but perhaps interesting to some readers, is that you can create spin-LEDs. If you use a material to permit only electrons of a certain spin (spin-up or spin-down) to transport to the excitation layer of the LED, the resultant emitted photons will be helically polarized. Fascinating stuff.
- radarsat1 6y agoInteresting, is that what is used for stereoscopic video screens?
- mojomark 6y agoGood question, but I'm 99.9999% sure no. They may us Circularly Polarized light (I actually don't know), but if they do it's made by filtration of unpolarized light rather than polarized electroluminescence. When I was researching the topic (~2008-ish), Spin-LEDs were largely still in the lab - a lot of work at Stanford spintronics lab as I recall. At that time, they were able to achieve a strong bias of circularly polarized light. I just googled it and apparently there's beed good progress in 'purifying' the polarization handedness [1]. If you can harness CP emission, it opens the door for many very interesting applications. CP light is fascinating. 1. https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11090/1109034/Recent-progress-in-spin-LED--realization-of-pure-circular/10.1117/12.2527862.short?SSO=1 https://www.spiedigitallibrary.org/conference-proceedings-of...
- radarsat1 6y agoVery cool, thanks for answer and the paper link!