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Title: Energy Gap Closure of Crystalline Molecular Hydrogen with Pressure

Journal Article · · Physical Review Letters

Here, we study the gap closure with pressure of crystalline molecular hydrogen. The gaps are obtained from grand-canonical quantum Monte Carlo methods properly extended to quantum and thermal crystals, simulated by coupled electron ion Monte Carlo methods. Nuclear zero point effects cause a large reduction in the gap (~2 eV). Depending on the structure, the fundamental indirect gap closes between 380 and 530 GPa for ideal crystals and 330–380 GPa for quantum crystals. Beyond this pressure the system enters into a bad metal phase where the density of states at the Fermi level increases with pressure up to ~450–500 GPa when the direct gap closes. Our work partially supports the interpretation of recent experiments in high pressure hydrogen.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); Agence Nationale de la Recherche (ANR); National Science Foundation (NSF); State of Illinois
Grant/Contract Number:
NA0001789; OCI 07-25070; NA DE-NA0001789
OSTI ID:
1801051
Alternate ID(s):
OSTI ID: 1604845
Journal Information:
Physical Review Letters, Vol. 124, Issue 11; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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