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Giant photo‐induced chirality in thin film Ge2Sb2Te5

Giant photo‐induced chirality in thin film Ge2Sb2Te5
Giant photo‐induced chirality in thin film Ge2Sb2Te5
Induction, tuning or amplification of chirality in various classes of materials and probing their chiral response is a subject of growing research. Here, we report a large chiral signal that is rapidly imprinted in achiral amorphous Ge2Sb2Te5 (GST) thin films measured using synchrotron circular dichroism spectroscopy. The chirality is induced by illuminating the films with pulsed circularly polarized (chiral) laser light for less than 2 microseconds in total. The effects of laser fluence and film thickness on the chiral response are reported. Correlation of the optical results with structural studies by electron diffraction and model simulations suggests that alignment of re‐amorphized fragments in the crystallized film along the electric field vector of the light forms the centers that are responsible for the observed chirality. These results suggest opportunities for practical applications of this phenomenon and provide avenues for further studies of chirality induction in materials with impact in a wide range of disciplines.
1862-6254
Shanmugam, Janaki
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Borisenko, Konstantin
ed0a14a2-eb41-4460-bf12-731ade24c96b
Luers, Andrew
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Ewart, Paul
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Shah, Priyav
972483e0-1fa1-45ab-bbc1-8173a4be4c52
Williams, Benjamin
c272c6c2-322d-4c7f-adb9-71f031316aff
Craig, Christopher
2328b42b-552e-4a82-941d-45449e952f10
Hewak, Daniel
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Hussain, Rohanah
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Javorfi, Tamas
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Siligardi, Giuliano
d4c6a554-7b0b-427b-bf96-7fe0c42346b2
Bosman, Michel
8cf09203-43d8-40c9-bc22-93fe95c4ac27
Kirkland, Angus
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Shanmugam, Janaki
28fa953c-aaea-4895-9987-c057f0060ece
Borisenko, Konstantin
ed0a14a2-eb41-4460-bf12-731ade24c96b
Luers, Andrew
7977ce69-363a-446a-991b-49eb71929390
Ewart, Paul
be47d3f3-4477-4cfd-8d2a-81387dfc50e3
Shah, Priyav
972483e0-1fa1-45ab-bbc1-8173a4be4c52
Williams, Benjamin
c272c6c2-322d-4c7f-adb9-71f031316aff
Craig, Christopher
2328b42b-552e-4a82-941d-45449e952f10
Hewak, Daniel
87c80070-c101-4f7a-914f-4cc3131e3db0
Hussain, Rohanah
33631043-b698-4396-b901-9d4a4ace1ff2
Javorfi, Tamas
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Siligardi, Giuliano
d4c6a554-7b0b-427b-bf96-7fe0c42346b2
Bosman, Michel
8cf09203-43d8-40c9-bc22-93fe95c4ac27
Kirkland, Angus
bf904d4f-d98b-46d2-8863-3a0a97dae8a3

Shanmugam, Janaki, Borisenko, Konstantin, Luers, Andrew, Ewart, Paul, Shah, Priyav, Williams, Benjamin, Craig, Christopher, Hewak, Daniel, Hussain, Rohanah, Javorfi, Tamas, Siligardi, Giuliano, Bosman, Michel and Kirkland, Angus (2019) Giant photo‐induced chirality in thin film Ge2Sb2Te5. Physica Status Solidi (RRL) Rapid Research Letters. (doi:10.1002/pssr.201900449).

Record type: Article

Abstract

Induction, tuning or amplification of chirality in various classes of materials and probing their chiral response is a subject of growing research. Here, we report a large chiral signal that is rapidly imprinted in achiral amorphous Ge2Sb2Te5 (GST) thin films measured using synchrotron circular dichroism spectroscopy. The chirality is induced by illuminating the films with pulsed circularly polarized (chiral) laser light for less than 2 microseconds in total. The effects of laser fluence and film thickness on the chiral response are reported. Correlation of the optical results with structural studies by electron diffraction and model simulations suggests that alignment of re‐amorphized fragments in the crystallized film along the electric field vector of the light forms the centers that are responsible for the observed chirality. These results suggest opportunities for practical applications of this phenomenon and provide avenues for further studies of chirality induction in materials with impact in a wide range of disciplines.

Text
Shanmugam_et_al-2019-physica_status_solidi_(RRL)_-_Rapid_Research_Letters - Accepted Manuscript
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e-pub ahead of print date: 1 October 2019

Identifiers

Local EPrints ID: 434739
URI: https://eprints.soton.ac.uk/id/eprint/434739
ISSN: 1862-6254
PURE UUID: d1e2488d-6499-4a87-8f90-84e3f16a18d0
ORCID for Christopher Craig: ORCID iD orcid.org/0000-0001-6919-4294
ORCID for Daniel Hewak: ORCID iD orcid.org/0000-0002-2093-5773

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Date deposited: 08 Oct 2019 16:30
Last modified: 09 Oct 2019 00:39

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Contributors

Author: Janaki Shanmugam
Author: Konstantin Borisenko
Author: Andrew Luers
Author: Paul Ewart
Author: Priyav Shah
Author: Benjamin Williams
Author: Daniel Hewak ORCID iD
Author: Rohanah Hussain
Author: Tamas Javorfi
Author: Giuliano Siligardi
Author: Michel Bosman
Author: Angus Kirkland

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