Interplay between Chiro-Optical and Spin Transport Properties in Chiral CdSe Quantum Dots

Shiby, Elizabeth; Sun, Rui; Bloom, Brian P.; Albro, Joseph A.; Sun, Dali; Waldeck, David H.

doi:10.1021/acsnano.5c12765

Interplay between Chiro-Optical and Spin Transport Properties in Chiral CdSe Quantum Dots

Journal Article · Mon Sep 22 00:00:00 EDT 2025 · ACS Nano

DOI:https://doi.org/10.1021/acsnano.5c12765· OSTI ID:2999013

Shiby, Elizabeth ^[1]; Sun, Rui ^[2]; ^[1]; Albro, Joseph A. ^[1]; ^[2]; ^[1]

University of Pittsburgh, PA (United States)
North Carolina State University, Raleigh, NC (United States)

The chiral-induced spin selectivity (CISS) effect offers compelling approaches for manipulating spin-dependent processes in both chemistry and physics, yet the physical mechanism(s) underpinning CISS are still debated. Here we present a study of structure−property relationships in chiral quantum dot assemblies to identify attributes of CISS-based phenomena. Our results show that the circular dichroism (CD) strength of chiral CdSe quantum dots’ primary exciton transition correlates with two CISS properties, the propensity to transmit pure spin currents and to produce spin-polarized charge currents. While the spin-polarized charge current reverses its sign with a change in the polarity of the CD signal, the pure spin current transport does not. The trends in both transport types can be rationalized in terms of chirality-induced splitting of spin sub-bands, which are modulated by chiral symmetry breaking under charge transport through the CdSe quantum dots.

View Accepted Manuscript (DOE)

Research Organization:: North Carolina State University, Raleigh, NC (United States)

Sponsoring Organization:: Air Force Office of Scientific Research; USDOE

Grant/Contract Number:: SC0020992

OSTI ID:: 2999013

Journal Information:: ACS Nano, Journal Name: ACS Nano Journal Issue: 39 Vol. 19; ISSN 1936-086X; ISSN 1936-0851

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Interplay between Chiro-Optical and Spin Transport Properties in Chiral CdSe Quantum Dots

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