Abstract：
:The knowledge of the metallization of warm dense helium has important implications for understanding the thermal histories, stellar structure and magnetic field environment of giant planets. However, it is also a pendent scientific topic. For a revisiting into the properties of warm dense helium, we performed extensive quantum Langevin molecular dynamic simulations and electronic structure calculations to study helium over a very wide range of density (ρ = 1~24 g/cm3) and temperature (T = 10~160 kK). The dependencies of helium band gap on ρ and T were presented and a metallization boundary of helium was thus determined by gap closure. Such a boundary is further identified by the calculated electrical conductivity and optical reflectivity based on Kubo-Greenwood formula: along the boundary, the electrical conductivities are found to be 7.0 × 105~1.3 × 106 Ω-1 m-1 and the optical reflectivity value at 532 nm is about 0.55, which are typical values for true metal.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Zhang W,Li Z,Fu Z,Dai J,Chen Q,Cai Ldoi
10.1038/srep41885subject
Has Abstractpub_date
2017-02-03 00:00:00pages
41885issn
2045-2322pii
srep41885journal_volume
7pub_type
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