Quantum distribution of protons in solid molecular hydrogen at megabar pressures

Hikaru Kitamura, Shinji Tsuneyuki (), Tadashi Ogitsu and Takashi Miyake
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Hikaru Kitamura: Institute for Solid State Physics, University of Tokyo
Shinji Tsuneyuki: Institute for Solid State Physics, University of Tokyo
Tadashi Ogitsu: Institute for Solid State Physics, University of Tokyo
Takashi Miyake: Joint Research Center for Atom Technology

Nature, 2000, vol. 404, issue 6775, 259-262

Abstract: Abstract Solid hydrogen, a simple system consisting only of protons and electrons, exhibits a variety of structural phase transitions at high pressures. Experimental studies1 based on static compression up to about 230 GPa revealed three relevant phases of solid molecular hydrogen: phase I (high-temperature, low-pressure phase), phase II (low-temperature phase) and phase III (high-pressure phase). Spectroscopic data suggest that symmetry breaking, possibly related to orientational ordering1,2, accompanies the transition into phases II and III. The boundaries dividing the three phases exhibit a strong isotope effect3, indicating that the quantum-mechanical properties of hydrogen nuclei are important. Here we report the quantum distributions of protons in the three phases of solid hydrogen, obtained by a first-principles path-integral molecular dynamics method. We show that quantum fluctuations of protons effectively hinder molecular rotation—that is, a quantum localization occurs. The obtained crystal structures have entirely different symmetries from those predicted by the conventional simulations which treat protons classically.

Date: 2000
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DOI: 10.1038/35005027

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