Medium-Range Order in Amorphous Ices Revealed by Persistent Homology

Title
Medium-Range Order in Amorphous Ices Revealed by Persistent Homology
Authors
김동훈홍성연
Issue Date
2019-08
Publisher
Journal of physics, Condensed matter : an Institute of Physics journal
Citation
VOL 31, NO 45-455403-7
Abstract
Despite the amorphous nature of glassy water, x-ray or neutron scattering experiments reveal sharp peaks in the structure factor, indicating the existence of medium-range order (MRO) in the system. However the real space origin of the peaks has yet to be disclosed. Herein, we use a combined approach of molecular dynamics simulations and persistent homology (PH) to investigate two types of glassy water, low-density amorphous (LDA) and high-density amorphous (HDA) ices. We present prominent MRO ring structures in each type of the ices, distinguished by their size and shape as well as the number of their components: MRO rings in HDA are observed smaller, less planar and more membered, compared to those in LDA. The PH-extracted MRO rings successfully reproduce the quantitative features, including the position and width, of the first sharp diffraction peaks in the structure factor, hence suitably serving as the origin of experimental MRO signatures in the amorphous ices. Our study supports that PH is an effective tool to identify hidden MRO in amorphous configurations.
URI
http://pubs.kist.re.kr/handle/201004/70086
ISSN
0953-8984
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KIST Publication > Article
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