Hydrogen dynamics in solid formic acid: insights from simulations with quantum colored-noise thermostats

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F18%3A43916706" target="_blank" >RIV/60461373:22340/18:43916706 - isvavai.cz</a>

Result on the web

<a href="https://iopscience.iop.org/article/10.1088/1742-6596/1055/1/012003" target="_blank" >https://iopscience.iop.org/article/10.1088/1742-6596/1055/1/012003</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1742-6596/1055/1/012003" target="_blank" >10.1088/1742-6596/1055/1/012003</a>

Result language

angličtina

Original language name

Hydrogen dynamics in solid formic acid: insights from simulations with quantum colored-noise thermostats

Original language description

With an increase of computational capabilities, ab initio molecular dynamics becomes the natural choice for exploring the nuclear dynamics of solids. As based on classical mechanics, the validity of this approach is, in-principle, limited to the high-T regime, whilst low-temperature simulations require inclusion of quantum effects. The methods commonly used to account for nuclear quantum effects are based on the path-integral formalism, which become, however, particularly time consuming when high accuracy methods are used for calculating forces. Recently, new efficient alternative approaches to account for quantum nature of nuclei have been proposed, using so-called quantum thermostats. In this work, we examine the simulations performed with the quantum colored-noise thermostat introduced by Ceriotti [Phys. Rev. Lett., 103:030603, 2009]. We present the tests of portable implementation of the quantum thermostat in the ABIN program, which has been extended to periodic systems through the interface to CASTEP, a leading spectroscopy-oriented plane-wave density functional theory code. The range of applicability of quantum-thermostatted molecular dynamics simulations for the interpretation of neutron scattering data was examined and compared to classical molecular dynamics and lattice-dynamics simulations, using solid formic acid case as a test bed. We find that the approach is particularly useful for the modeling of low-temperature inelastic neutron scattering spectra as well as provides some theoretical estimate for the low-limit of the mean kinetic energy. While finding the quantum-thermostat to seriously affect the dynamic properties of the title system, we illustrate to which extent the unperturbed response can be successfully recovered.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

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OECD FORD branch

10403 - Physical chemistry

Project

<a href="/en/project/GA18-16577S" target="_blank" >GA18-16577S: Droplets, ice and aerosols in silico: Combining ab initio and classical approaches</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Physics: Conference Series

ISSN

1742-6588

e-ISSN

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Volume of the periodical

1055

Issue of the periodical within the volume

Conference 1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

20

Pages from-to

012003

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85051734223