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Park, Noejung
Computational Physics & Electronic Structure Lab
Research Interests
  • Electronic structure calculation, computational physics, computational material science

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Unusual Spin Polarization in the Chirality- Induced Spin Selectivity

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Title
Unusual Spin Polarization in the Chirality- Induced Spin Selectivity
Author
Wolf, YotamLiu, YizhouXiao, JiewenPark, NoejungYan, Binghai
Issue Date
2022-10
Publisher
American Chemical Society
Citation
ACS NANO
Abstract
Chirality-induced spin selectivity (CISS) refers to the fact that electrons get spin polarized after passing through chiral molecules in a nanoscale transport device or in photoemission experiments. In CISS, chiral molecules are commonly believed to be a spin filter through which one favored spin transmits and the opposite spin gets reflected; that is, transmitted and reflected electrons exhibit opposite spin polarization. In this work, we point out that such a spin filter scenario contradicts the principle that equilibrium spin current must vanish. Instead, we find that both transmitted and reflected electrons present the same type of spin polarization, which is actually ubiquitous for a two-terminal device. More accurately, chiral molecules play the role of a spin polarizer rather than a spin filter. The direction of spin polarization is determined by the molecule chirality and the electron incident direction. And the magnitude of spin polarization relies on local spin–orbit coupling in the device. Our work brings a deeper understanding on CISS and interprets recent experiments, for example, the CISS-driven anomalous Hall effect.
URI
https://scholarworks.unist.ac.kr/handle/201301/60040
DOI
10.1021/acsnano.2c07088
ISSN
1936-0851
Appears in Collections:
PHY_Journal Papers
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