Normal-incidence light isolates the bulk source of spin-polarized photocurrents in 2D perovskites
Researchers at Institute of Science Tokyo, led by Professor Kouji Taniguchi and Assistant Professor Po-Jung Huang with graduate student Ichi Naruse, have devised a way to generate spin-polarized photocurrents from the bulk of a noncentrosymmetric crystal while cleanly separating that signal from surface effects – a long-standing obstacle in using the circular photogalvanic effect (CPGE) for opto-spintronic devices.
CPGE generates a helicity-dependent photocurrent – one whose direction depends on whether the illuminating light is left- or right-circularly polarized – in materials with strong spin–orbit coupling and broken inversion symmetry. Because electron spin and momentum become locked together in such materials, CPGE offers a purely optical way to generate and probe spin-polarized currents without an external magnetic field, making it attractive for opto-spintronic devices and helicity-sensitive photodetectors. The catch: conventional measurements excite only a thin near-surface region of the material, where bulk and surface electronic states coexist and their contributions to the measured photocurrent are difficult to disentangle.
Source: https://www.spintronics-info.com/normal-incidence-light-isolates-bulk-source-spin-polarized-photocurrents-2d
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