hal-03370279
https://cnrs.hal.science/hal-03370279
https://cnrs.hal.science/hal-03370279/document
https://cnrs.hal.science/hal-03370279/file/2009.00652.pdf
arxiv:2009.00652
doi:10.1103/PhysRevB.102.195133
[UGA] HAL Grenoble Alpes
[CNRS] CNRS - Centre national de la recherche scientifique
[LPMMC] Laboratoire de Physique et Modélisation des Milieux Condensés
[UGA-EPE] Université Grenoble Alpes [2020-*]
Electronic energy gap closure and metal-insulator transition in dense liquid hydrogen
Gorelov, Vitaly
Ceperley, David M.
Holzmann, Markus
Pierleoni, Carlo
[PHYS.COND] Physics [physics]/Condensed Matter [cond-mat]
ART
Using Quantum Monte Carlo (QMC) calculations, we investigate the insulator-metal transition observed in liquid hydrogen at high pressure. Below the critical temperature of the transition from the molecular to the atomic liquid, the fundamental electronic gap closure occurs abruptly, with a small discontinuity reflecting the weak first-order transition in the thermodynamic equation of state. Above the critical temperature, molecular dissociation sets in while the gap is still open. When the gap closes, the decay of the off-diagonal reduced density matrix shows that the liquid enters a gapless, but localized phase: there is a cross-over between the insulating and the metallic liquids. Compared to different DFT functionals, our QMC calculations provide larger values for the fundamental gap and the electronic density of states close to the band edges, indicating that optical properties from DFT potentially benefit from error cancellations.
2020-11
2021-10-07
en
Physical Review B
American Physical Society