Issue 21, 2021

Intrinsic helical twist and chirality in ultrathin tellurium nanowires

Abstract

Robust atomic-to-meso-scale chirality is now observed in the one-dimensional form of tellurium. This enables a large and counter-intuitive circular-polarization dependent second harmonic generation response above 0.2 which is not present in two-dimensional tellurium. Orientation variations in 1D tellurium nanowires obtained by four-dimensional scanning transmission electron microscopy (4D-STEM) and their correlation with unconventional non-linear optical properties by second harmonic generation circular dichroism (SHG-CD) uncovers an unexpected circular-polarization dependent SHG response from 1D nanowire bundles – an order-of-magnitude higher than in single-crystal two-dimensional tellurium structures – suggesting the atomic- and meso-scale crystalline structure of the 1D material possesses an inherent chirality not present in its 2D form; and which is strong enough to manifest even in the aggregate non-linear optical (NLO) properties of aggregates.

Graphical abstract: Intrinsic helical twist and chirality in ultrathin tellurium nanowires

Supplementary files

Article information

Article type
Paper
Submitted
05 Mar 2021
Accepted
05 May 2021
First published
13 May 2021

Nanoscale, 2021,13, 9606-9614

Author version available

Intrinsic helical twist and chirality in ultrathin tellurium nanowires

A. Londoño-Calderon, D. J. Williams, M. M. Schneider, B. H. Savitzky, C. Ophus, S. Ma, H. Zhu and M. T. Pettes, Nanoscale, 2021, 13, 9606 DOI: 10.1039/D1NR01442K

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