Chiral perovskite quantum wells extend room-temperature spin coherence to about 5 ns
Researchers at the Hong Kong University of Science and Technology (HKUST), the Southern University of Science and Technology (SUSTech), Chongqing Normal University and Sivananthan Laboratories have extended the spin coherence lifetime of a chiral halide perovskite to about 5 ns at room temperature. The team says that long-lived spin polarization has typically been possible only at ultralow temperatures.
Halide perovskites are being explored for chiroptical and spintronic applications, but the researchers note that earlier demonstrations of spin injection from chiral single quantum wells into achiral semiconductors have been limited at the device level by fast spin losses at interfaces and in the bulk. To address this, they built oriented chiral multiple quantum wells with a two-step seed-assisted crystallization method. The wells have varying widths and span the 2D (n=1), quasi-2D (n=2, 3, 4 and so on) and 3D perovskite phases, with continuous intrinsic chirality across all of them. The average circular dichroism dissymmetry factor is 1.5 × 10⁻².
Source: https://www.spintronics-info.com/chiral-perovskite-quantum-wells-extend-room-temperature-spin-coherence-about-5
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