The properties of hydrogen and helium under extreme conditions

JM McMahon, MA Morales, C Pierleoni… - Reviews of modern …, 2012 - APS
Hydrogen and helium are the most abundant elements in the Universe. They are also, in
principle, the most simple. Nonetheless, they display remarkable properties under extreme …

Understanding dense hydrogen at planetary conditions

R Helled, G Mazzola, R Redmer - Nature Reviews Physics, 2020 - nature.com
Materials at high pressures and temperatures are of great interest for planetary science and
astrophysics, warm dense-matter physics and inertial confinement fusion research …

[HTML][HTML] Liquid–liquid transition and polyamorphism

H Tanaka - The Journal of Chemical Physics, 2020 - pubs.aip.org
Two or more liquid states may exist even for single-component substances, which is known
as liquid polymorphism, and the transition between them is called liquid–liquid transition …

Evidence for a new phase of dense hydrogen above 325 gigapascals

P Dalladay-Simpson, RT Howie, E Gregoryanz - Nature, 2016 - nature.com
Almost 80 years ago it was predicted that, under sufficient compression, the H–H bond in
molecular hydrogen (H2) would break, forming a new, atomic, metallic, solid state of …

Direct observation of an abrupt insulator-to-metal transition in dense liquid deuterium

MD Knudson, MP Desjarlais, A Becker, RW Lemke… - Science, 2015 - science.org
Eighty years ago, it was proposed that solid hydrogen would become metallic at sufficiently
high density. Despite numerous investigations, this transition has not yet been …

Conductive dense hydrogen

MI Eremets, IA Troyan - Nature materials, 2011 - nature.com
Molecular hydrogen is expected to exhibit metallic properties under megabar pressures.
This metal is predicted to be superconducting with a very high critical temperature, T c, of …

Mixed molecular and atomic phase of dense hydrogen

RT Howie, CL Guillaume, T Scheler, AF Goncharov… - Physical review …, 2012 - APS
We used Raman and visible transmission spectroscopy to investigate dense hydrogen
(deuterium) up to 315 (275) GPa at 300 K. At around 200 GPa, we observe the phase …

Ab initio simulations for material properties along the Jupiter adiabat

M French, A Becker, W Lorenzen… - The Astrophysical …, 2012 - iopscience.iop.org
We determine basic thermodynamic and transport properties of hydrogen–helium–water
mixtures for the extreme conditions along Jupiter's adiabat via ab initio simulations, which …

Insulator-metal transition in dense fluid deuterium

PM Celliers, M Millot, S Brygoo, RS McWilliams… - Science, 2018 - science.org
Dense fluid metallic hydrogen occupies the interiors of Jupiter, Saturn, and many extrasolar
planets, where pressures reach millions of atmospheres. Planetary structure models must …

Evidence for a first-order liquid-liquid transition in high-pressure hydrogen from ab initio simulations

MA Morales, C Pierleoni… - Proceedings of the …, 2010 - National Acad Sciences
Using quantum simulation techniques based on either density functional theory or quantum
Monte Carlo, we find clear evidence of a first-order transition in liquid hydrogen, between a …