Researchers extend spin lifetime fivefold in a quasi-2D perovskite and realize spin-polarized lasing
Researchers at the University of Chinese Academy of Sciences’ Hangzhou Institute for Advanced Study, the Shanghai Institute of Optics and Fine Mechanics of the Chinese Academy of Sciences, and Huazhong University of Science and Technology have identified the dominant spin relaxation mechanism in quasi-2D perovskites and shown how to suppress it, enabling spin-polarized lasing at low temperatures.
Quasi-2D perovskites are attractive for spin-polarized lasers because their structural inversion asymmetry produces strong spin-orbit coupling, which helps with spin injection and spin splitting of the electronic bands. The same coupling, however, speeds up spin relaxation, so it is hard to keep spin polarization alive long enough for lasing. The team found that the Bir-Aronov-Pikus (BAP) mechanism, driven by electron-hole exchange interactions within excitons, is the dominant relaxation channel that blocks spin-polarized lasing.
Source: https://www.spintronics-info.com/researchers-extend-spin-lifetime-fivefold-quasi-2d-perovskite-and-realize-spin
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