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Title: Topological Surface States in Dense Solid Hydrogen

Abstract

Metallization of dense hydrogen and associated possible high-temperature superconductivity represents one of the key problems of physics. Recent theoretical studies show that before becoming a good metal, compressed solid hydrogen passes through a semimetallic stage. We show that such semimetallic phases predicted to be the most stable at multimegabar (~300 GPa) pressures are not conventional semimetals: they exhibit topological metallic surface states inside the bulk “direct” gap in the two-dimensional surface Brillouin zone; that is, metallic surfaces may appear even when the bulk of the material remains insulating. Examples include hydrogen in the Cmca-12 and Cmca-4 structures; Pbcn hydrogen also has metallic surface states but they are of a nontopological nature. The results provide predictions for future measurements, including probes of possible surface superconductivity in dense hydrogen.

Authors:
 [1];  [2]
  1. Carnegie Inst. of Washington, Washington, DC (United States)
  2. George Washington Univ., Washington, DC (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1388101
Alternate Identifier(s):
OSTI ID: 1331720
Grant/Contract Number:  
SC0001057; NA-0002006; CDAC; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 117; Journal Issue: 20; Related Information: EFree partners with Carnegie Institution of Washington (lead); California Institute of Technology; Colorado School of Mines; Cornell University; Lehigh University; Pennsylvania State University; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; catalysis (heterogeneous); solar (photovoltaic); phonons; thermoelectric; energy storage (including batteries and capacitors); hydrogen and fuel cells; superconductivity; charge transport; mesostructured materials; materials and chemistry by design, synthesis (novel materials)

Citation Formats

Naumov, Ivan I., and Hemley, Russell J. Topological Surface States in Dense Solid Hydrogen. United States: N. p., 2016. Web. doi:10.1103/PhysRevLett.117.206403.
Naumov, Ivan I., & Hemley, Russell J. Topological Surface States in Dense Solid Hydrogen. United States. https://doi.org/10.1103/PhysRevLett.117.206403
Naumov, Ivan I., and Hemley, Russell J. Thu . "Topological Surface States in Dense Solid Hydrogen". United States. https://doi.org/10.1103/PhysRevLett.117.206403. https://www.osti.gov/servlets/purl/1388101.
@article{osti_1388101,
title = {Topological Surface States in Dense Solid Hydrogen},
author = {Naumov, Ivan I. and Hemley, Russell J.},
abstractNote = {Metallization of dense hydrogen and associated possible high-temperature superconductivity represents one of the key problems of physics. Recent theoretical studies show that before becoming a good metal, compressed solid hydrogen passes through a semimetallic stage. We show that such semimetallic phases predicted to be the most stable at multimegabar (~300 GPa) pressures are not conventional semimetals: they exhibit topological metallic surface states inside the bulk “direct” gap in the two-dimensional surface Brillouin zone; that is, metallic surfaces may appear even when the bulk of the material remains insulating. Examples include hydrogen in the Cmca-12 and Cmca-4 structures; Pbcn hydrogen also has metallic surface states but they are of a nontopological nature. The results provide predictions for future measurements, including probes of possible surface superconductivity in dense hydrogen.},
doi = {10.1103/PhysRevLett.117.206403},
journal = {Physical Review Letters},
number = 20,
volume = 117,
place = {United States},
year = {Thu Nov 10 00:00:00 EST 2016},
month = {Thu Nov 10 00:00:00 EST 2016}
}

Journal Article:

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Cited by: 10 works
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