What are Accurate Measures of Chirality-Induced Spin Selectivity?
ORAL
Abstract
Chirality-induced spin selectivity (CISS) is a phenomenon in which structural chirality induces different conductivities for electrons with opposite spins. This effect has created new opportunities in spintronics, chemical separations and reactions, molecular biology, and quantum information science. Despite its broad applications, inconsistencies in the definition and quantitative analysis of CISS has arisen across various experimental studies.
In this talk, I will clarify key concepts of CISS and focus on the distinctions between different experimental techniques. In photoelectron spectroscopy, spin polarization is determined from the intensity of photoelectrons deflected into spin-selective detectors, reflecting the efficiency of spin filtering. In contrast, in transport studies, spin current is an indirect measure, making the analysis of spin polarization challenging. Techniques such as the spin-valve effect and Hanle effect provide alternative quantitative analysis. In spin-valve studies, magnetoresistance or magnetoconductance is calculated from charge currents; In Hanle effect, the Hanle voltage is directly extracted from the Hanle curve at zero and high magnetic fields.
In this talk, I will clarify key concepts of CISS and focus on the distinctions between different experimental techniques. In photoelectron spectroscopy, spin polarization is determined from the intensity of photoelectrons deflected into spin-selective detectors, reflecting the efficiency of spin filtering. In contrast, in transport studies, spin current is an indirect measure, making the analysis of spin polarization challenging. Techniques such as the spin-valve effect and Hanle effect provide alternative quantitative analysis. In spin-valve studies, magnetoresistance or magnetoconductance is calculated from charge currents; In Hanle effect, the Hanle voltage is directly extracted from the Hanle curve at zero and high magnetic fields.
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Publication: Liu et al., ACS Nano 14, 15983 (2020); <br>Adhikari, Liu et al., Nature Communications 14, 5163 (2023); <br>Liu and Weiss, ACS Nano 17, 19502 (2023); <br>Liu, Adhikari, Wang et al., Advanced Materials 36, 2406347 (2024)
Presenters
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Tianhan Liu
University of California, Los Angeles
Authors
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Tianhan Liu
University of California, Los Angeles