Spin-glass charge ordering in ionic liquids

© 2019 American Physical Society. Ionic liquids form intricate nanostructures, both in the bulk and near charged surfaces. We show that given the ionic positions from molecular simulations, the ionic charges minimize a "spin-glass" Hamiltonian for nearest-neighbor interactions with remarka...

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Format: Article
Language:English
Published: American Physical Society (APS) 2020
Online Access:https://hdl.handle.net/1721.1/124808
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collection MIT
description © 2019 American Physical Society. Ionic liquids form intricate nanostructures, both in the bulk and near charged surfaces. We show that given the ionic positions from molecular simulations, the ionic charges minimize a "spin-glass" Hamiltonian for nearest-neighbor interactions with remarkable accuracy, for both room-temperature ionic liquids and water-in-salt electrolytes. Thus, long-range charge oscillations in ionic liquids result from positional ordering, which is maximized in ionic solids but gradually disappears with added solvent, increased temperature, or by complex molecular structures. As the electrolyte becomes more disordered, geometrical frustration in the spin-glass ground state reduces correlation lengths. Eventually, thermal fluctuations excite the system from its ground state and Poisson-Boltzmann behavior is recovered. More generally, spin-glass ordering arises in any liquid with antiferromagnetic correlations, such as molten salt or the two-dimensional vortex patterns found in superfluids and bacterial turbulence.
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spelling mit-1721.1/1248082020-04-23T03:15:56Z Spin-glass charge ordering in ionic liquids © 2019 American Physical Society. Ionic liquids form intricate nanostructures, both in the bulk and near charged surfaces. We show that given the ionic positions from molecular simulations, the ionic charges minimize a "spin-glass" Hamiltonian for nearest-neighbor interactions with remarkable accuracy, for both room-temperature ionic liquids and water-in-salt electrolytes. Thus, long-range charge oscillations in ionic liquids result from positional ordering, which is maximized in ionic solids but gradually disappears with added solvent, increased temperature, or by complex molecular structures. As the electrolyte becomes more disordered, geometrical frustration in the spin-glass ground state reduces correlation lengths. Eventually, thermal fluctuations excite the system from its ground state and Poisson-Boltzmann behavior is recovered. More generally, spin-glass ordering arises in any liquid with antiferromagnetic correlations, such as molten salt or the two-dimensional vortex patterns found in superfluids and bacterial turbulence. 2020-04-22T17:48:44Z 2020-04-22T17:48:44Z 2019-08-14T13:12:26Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/124808 "Spin-glass charge ordering in ionic liquids." en 10.1103/PhysRevMaterials.3.055606 Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society (APS) APS
spellingShingle Spin-glass charge ordering in ionic liquids
title Spin-glass charge ordering in ionic liquids
title_full Spin-glass charge ordering in ionic liquids
title_fullStr Spin-glass charge ordering in ionic liquids
title_full_unstemmed Spin-glass charge ordering in ionic liquids
title_short Spin-glass charge ordering in ionic liquids
title_sort spin glass charge ordering in ionic liquids
url https://hdl.handle.net/1721.1/124808