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DOE OSTI · 3367620

Ultrafast Inverse Chirality-Induced Spin Selectivity Observed by THz Emission

Dong, Yifan [National Laboratory of the Rockies, Golden, CO (United States)]·McConnell, Aeron [North Carolina State University]·Hautzinger, Matthew [National Laboratory of the Rockies, Golden, CO (United States)]·Haque, Md Azimul [National Laboratory of the Rockies, Golden, CO (United States)]·Comstock, Andrew [North Carolina State University]·Theiler, Pius [National Laboratory of the Rockies, Golden, CO (United States)]·Luther, Joseph [National Laboratory of the Rockies, Golden, CO (United States)]·Sercel, Peter [United States Department of Energy]·Sun, Dali [North Carolina State University]·Beard, Matthew [National Laboratory of the Rockies, Golden, CO (United States)] (ORCID:0000000227111355)
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Abstract

Chirality-induced spin selectivity (CISS) phenomena arise from an interplay among structural chirality, electron spin orientation, and charge current. Steady-state observations such as magnetoresistance offer little insight into the timescales that govern the spin-charge interconversion and often conflate interfacial and bulk phenomena. By contrast, inverse CISS involves the conversion of spin to a charge current. Using terahertz (THz) emission spectroscopy, we directly measured an ultrafast charge current due to inverse CISS with picosecond time resolution. Polarity and polarization analysis of the THz emission map the induced charge current direction upon spin injection. We found that a charge current is generated along the spin orientation that changes direction with stereochemical configuration. These observations directly demonstrate the inherent coupling between spin and charge currents in chiral systems, offering key insights into their fundamental dynamics.

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74 ATOMIC AND MOLECULAR PHYSICSchiral systemschirality-induced spin selectivityTHz emission

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Dong, Yifan [National Laboratory of the Rockies, Golden, CO (United States)], McConnell, Aeron [North Carolina State University], Hautzinger, Matthew [National Laboratory of the Rockies, Golden, CO (United States)], Haque, Md Azimul [National Laboratory of the Rockies, Golden, CO (United States)], Comstock, Andrew [North Carolina State University], Theiler, Pius [National Laboratory of the Rockies, Golden, CO (United States)], Luther, Joseph [National Laboratory of the Rockies, Golden, CO (United States)], Sercel, Peter [United States Department of Energy], Sun, Dali [North Carolina State University], Beard, Matthew [National Laboratory of the Rockies, Golden, CO (United States)] (ORCID:0000000227111355). 2025-11-06. Ultrafast Inverse Chirality-Induced Spin Selectivity Observed by THz Emission. https://doi.org/10.1126/science.ady4885

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