journal article·2020-01Open access

A Spectroscopic Study of the Insulator–Metal Transition in Liquid Hydrogen and Deuterium

Shuqing Jiang, Nicholas Holtgrewe, Zachary M. Geballe, Sergey S. Lobanov, Mohammad F. Mahmood, R. Stewart McWilliams, Alexander F. Goncharov

Advanced Science· Volume 7· Issue 2

Abstract

Abstract The insulator‐to‐metal transition in dense fluid hydrogen is an essential phenomenon in the study of gas giant planetary interiors and the physical and chemical behavior of highly compressed condensed matter. Using direct fast laser spectroscopy techniques to probe hydrogen and deuterium precompressed in a diamond anvil cell and laser heated on microsecond timescales, an onset of metal‐like reflectance is observed in the visible spectral range at P >150 GPa and T ≥ 3000 K. The reflectance increases rapidly with decreasing photon energy indicating free‐electron metallic behavior with a plasma edge in the visible spectral range at high temperatures. The reflectance spectra also suggest much longer electronic collision time (≥1 fs) than previously inferred, implying that metallic hydrogen at the conditions studied is not in the regime of saturated conductivity (Mott–Ioffe–Regel limit). The results confirm the existence of a semiconducting intermediate fluid hydrogen state en route to metallization.
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Research context

OpenAlex topics: High-pressure geophysics and materials · Advanced Chemical Physics Studies · Quantum, superfluid, helium dynamics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei Anhui 230031 China

Geophysical Laboratory Carnegie Institution of Washington Washington DC 20015 USA

Department of Mathematics Howard University 2400 Sixth Street NW Washington DC 20059 USA

GFZ German Research Center for Geosciences Section 3.6, Telegrafenberg 14473 Potsdam Germany

School of Physics and Astronomy and Centre for Science at Extreme Conditions University of Edinburgh Edinburgh EH9 3FD UK

Funding

National Natural Science Foundation of China · Chinese Academy of Sciences · Science Challenge Project · National Science Foundation · Army Research Office · Carnegie Institution of Washington · Engineering and Physical Sciences Research Council

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