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Related Experiment Video

Updated: Mar 7, 2026

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

Why Is the Mechanism Underlying the Chiral-Induced Selectivity Effect Still Challenging?

Ron Naaman¹, Yossi Paltiel²

¹Department of Chemical and Biological Physics, Weizmann Institute, Rehovot, Israel.

Advanced Materials (Deerfield Beach, Fla.)

|March 6, 2026

Summary

This summary is machine-generated.

Theorists find it difficult to explain the chiral-induced spin selectivity (CISS) effect due to its unique spin-dependent transport in chiral systems, differing from standard electron transfer theories. New experiments highlight missing elements in current models.

Keywords:

CISS chirality polarizability spin time reversal symmetry

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Area of Science:

Condensed matter physics
Quantum chemistry
Materials science

Background:

The chiral-induced spin selectivity (CISS) effect describes spin-polarized currents generated by chiral molecules.
Existing theories often model electron transport through linear systems, which may not fully capture chiral phenomena.

Purpose of the Study:

To elucidate the theoretical challenges in developing a comprehensive mechanism for the CISS effect.
To highlight the distinctions between spin-dependent transport in chiral systems and conventional electron transfer theories.

Main Methods:

This work is a perspective, analyzing existing theories and experimental data.
It identifies gaps in current theoretical frameworks for electron transfer.
It references experimental findings that underscore the importance of specific physical elements.

Main Results:

Theoretical models struggle with the CISS effect because they often overlook key aspects of spin-dependent transport unique to chiral environments.
Spin transport through chiral systems exhibits distinct characteristics compared to linear systems.
Experiments confirm the necessity of considering specific, currently missing, theoretical elements.

Conclusions:

A comprehensive mechanism for the CISS effect requires incorporating elements beyond conventional electron transfer theories.
Understanding these missing elements is crucial for advancing theoretical descriptions of spin-dependent phenomena in chiral materials.
Further theoretical development is needed to fully explain the CISS effect and its experimental observations.