Ultrafast inverse chirality-induced spin selectivity observed by THz emission

• 成果类型: Article
• 署名作者: Dong, Yifan; McConnell, Aeron; Hautzinger, Matthew P.; Haque, Md Azimul; Comstock, Andrew H.; Theiler, Pius M.; Luther, Joseph M.; Sercel, Peter C.; Sun, Dali; Beard, Matthew C.
• 署名单位: United States Department of Energy (DOE); National Renewable Energy Laboratory - USA; University of California System; University of California Riverside; North Carolina State University; North Carolina State University; University of Colorado System; University of Colorado Boulder
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8075; 1095-9203
• DOI: 10.1126/science.ady4885
• 发表日期: 2025-11-06
• 页码: 595-600
• 关键词: LONG-RANGE; spintronics; transport

摘要

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.