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Kheirmand M, Heydari N, Azami SM. Electronic structure, thermodynamic properties and metallic behaviours of hydrogen. Mol Phys 2021. [DOI: 10.1080/00268976.2020.1810350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Mahdi Kheirmand
- Department of Chemistry, Faculty of science, Yasouj University, Yasouj, Iran
| | - Neda Heydari
- Department of Chemistry, Faculty of science, Yasouj University, Yasouj, Iran
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Affiliation(s)
- Wei Fang
- School of Physics and Collaborative Innovation Centre of Quantum Matter, Peking University, Beijing, People's Republic of China
- Thomas Young Centre, London Centre for Nanotechnology, and Department of Physics and Astronomy, University College London, London, UK
- Laboratory of Physical Chemistry, ETH Zurich, Zurich, Switzerland
| | - Ji Chen
- Department of Electronic Structure Theory, Max Plank Institute for Solid State Research, Stuttgart, Germany
| | - Yexin Feng
- School of Physics and Electronics, Hunan University, Changsha, People's Republic of China
| | - Xin-Zheng Li
- School of Physics and Collaborative Innovation Centre of Quantum Matter, Peking University, Beijing, People's Republic of China
- State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Peking University, Beijing, People's Republic of China
| | - Angelos Michaelides
- Thomas Young Centre, London Centre for Nanotechnology, and Department of Physics and Astronomy, University College London, London, UK
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Yu Z, Geng HY, Sun Y, Chen Y. Optical properties of dense lithium in electride phases by first-principles calculations. Sci Rep 2018; 8:3868. [PMID: 29497122 PMCID: PMC5832767 DOI: 10.1038/s41598-018-22168-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Accepted: 02/15/2018] [Indexed: 11/21/2022] Open
Abstract
The metal-semiconductor-metal transition in dense lithium is considered as an archetype of interplay between interstitial electron localization and delocalization induced by compression, which leads to exotic electride phases. In this work, the dynamic dielectric response and optical properties of the high-pressure electride phases of cI16, oC40 and oC24 in lithium spanning a wide pressure range from 40 to 200 GPa by first-principles calculations are reported. Both interband and intraband contribution to the dielectric function are deliberately treated with the linear response theory. One intraband and two interband plasmons in cI16 at 70 GPa induced by a structural distortion at 2.1, 4.1, and 7.7 eV are discovered, which make the reflectivity of this weak metallic phase abnormally lower than the insulating phase oC40 at the corresponding frequencies. More strikingly, oC24 as a reentrant metallic phase with higher conductivity becomes more transparent than oC40 in infrared and visible light range due to its unique electronic structure around Fermi surface. An intriguing reflectivity anisotropy in both oC40 and oC24 is predicted, with the former being strong enough for experimental detection within the spectrum up to 10 eV. The important role of interstitial localized electrons is highlighted, revealing diversity and rich physics in electrides.
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Affiliation(s)
- Zheng Yu
- National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP; P.O. Box 919-102 Mianyang, Sichuan, 621900, PR China
| | - Hua Y Geng
- National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP; P.O. Box 919-102 Mianyang, Sichuan, 621900, PR China.
| | - Y Sun
- National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP; P.O. Box 919-102 Mianyang, Sichuan, 621900, PR China
| | - Y Chen
- Fracture and Reliability Research Institute, School of Engineering, Tohoku University 6-6-01 Aramakiaoba, Aoba-ku, Sendai, 980-8579, Japan
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Liu XD, Howie RT, Zhang HC, Chen XJ, Gregoryanz E. High-Pressure Behavior of Hydrogen and Deuterium at Low Temperatures. PHYSICAL REVIEW LETTERS 2017; 119:065301. [PMID: 28949614 DOI: 10.1103/physrevlett.119.065301] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Indexed: 06/07/2023]
Abstract
In situ high-pressure low-temperature high-quality Raman data for hydrogen and deuterium demonstrate the presence of a novel phase, phase II^{'}, unique to deuterium and distinct from the known phase II. Phase II^{'} of D_{2} is not observed in hydrogen, making it the only phase that does not exist in both isotopes and occupies a significant part of P-T space from ∼25 to 110 GPa and below 125 K. For H_{2}, the data show that below 30 K the transition to phase II happens at as low as 73 GPa. The transformation from phase II to III commences at around ∼155 GPa and is completed by 170 GPa with the average pressure of ∼160 GPa being slightly higher than previously thought. The updated phase diagrams of H_{2} and D_{2} demonstrate the difference between the isotopes at low temperatures and moderate pressures, providing new information on the phase diagrams of both elements.
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Affiliation(s)
- Xiao-Di Liu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Ross T Howie
- Center for High Pressure Science & Technology Advanced Research, Shanghai, 201203, China
| | - Hui-Chao Zhang
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
- University of Science and Technology of China, Hefei 230026, China
| | - Xiao-Jia Chen
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
- Center for High Pressure Science & Technology Advanced Research, Shanghai, 201203, China
| | - Eugene Gregoryanz
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
- Center for High Pressure Science & Technology Advanced Research, Shanghai, 201203, China
- Centre for Science at Extreme Conditions & School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
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Chen Y, Geng HY, Yan X, Sun Y, Wu Q, Chen X. Prediction of Stable Ground-State Lithium Polyhydrides under High Pressures. Inorg Chem 2017; 56:3867-3874. [DOI: 10.1021/acs.inorgchem.6b02709] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yangmei Chen
- National Key Laboratory of Shock
Wave and Detonation Physics, Institute of Fluid Physics, CAEP, P.O. Box 919-102, Mianyang, Sichuan People’s Republic of China, 621900
- Institute
of Atomic and Molecular Physics, College of Physical Science and Technology, Sichuan University, Chengdu, Sichuan People’s Republic of China, 610065
| | - Hua Y. Geng
- National Key Laboratory of Shock
Wave and Detonation Physics, Institute of Fluid Physics, CAEP, P.O. Box 919-102, Mianyang, Sichuan People’s Republic of China, 621900
| | - Xiaozhen Yan
- National Key Laboratory of Shock
Wave and Detonation Physics, Institute of Fluid Physics, CAEP, P.O. Box 919-102, Mianyang, Sichuan People’s Republic of China, 621900
- Institute
of Atomic and Molecular Physics, College of Physical Science and Technology, Sichuan University, Chengdu, Sichuan People’s Republic of China, 610065
- School
of Science, Jiangxi University of Science and Technology, Ganzhou, Jiangxi People’s Republic of China, 341000
| | - Yi Sun
- National Key Laboratory of Shock
Wave and Detonation Physics, Institute of Fluid Physics, CAEP, P.O. Box 919-102, Mianyang, Sichuan People’s Republic of China, 621900
| | - Qiang Wu
- National Key Laboratory of Shock
Wave and Detonation Physics, Institute of Fluid Physics, CAEP, P.O. Box 919-102, Mianyang, Sichuan People’s Republic of China, 621900
| | - Xiangrong Chen
- Institute
of Atomic and Molecular Physics, College of Physical Science and Technology, Sichuan University, Chengdu, Sichuan People’s Republic of China, 610065
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Geng HY, Wu Q, Sun Y. Prediction of a Mobile Solid State in Dense Hydrogen under High Pressures. J Phys Chem Lett 2017; 8:223-228. [PMID: 27973848 DOI: 10.1021/acs.jpclett.6b02453] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Solid rigidity and liquid-scale mobility are thought to be incompatible in elemental substances. One cannot have an elemental solid that is long-range positionally ordered wherein the atoms flow like in a liquid simultaneously. The only exception might be the hypothetical supersolid state of 4He. In this work, we demonstrate that such exotic state could exist even in the classical regime. Using ab initio molecular dynamics (AIMD) and ab initio path integral molecular dynamics (AI-PIMD), a novel state of dense hydrogen that simultaneously has both long-range spatial ordering and liquid-scale atomic mobility is discovered at 1 to 1.5 TPa (1 TPa ≈ 10 000 000 atmospheric pressures). The features distinct from a normal solid and liquid are carefully characterized, and the stability and melting behavior are investigated. Extensive AI-PIMD simulations further revealed that this state might be (meta-)stable even at ultralow temperatures, suggesting an emerging candidate for an alternative type of supersolid state in dense metallic hydrogen.
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Affiliation(s)
- Hua Y Geng
- National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP ; P.O. Box 919-102 Mianyang, Sichuan P. R. China , 621900
| | - Q Wu
- National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP ; P.O. Box 919-102 Mianyang, Sichuan P. R. China , 621900
| | - Y Sun
- National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP ; P.O. Box 919-102 Mianyang, Sichuan P. R. China , 621900
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