Abstract
We present an ab initio study of the electronic response function of sodium in its five known metallic phases from 0 to 180 GPa at room temperature. The considered formalism is based on a interpolation scheme within time-dependent density functional theory that uses maximally localized Wannier functions, providing an accurate sampling of the reciprocal space. Besides showing an excellent agreement with inelastic x-ray scattering experiments [Phys. Rev. Lett. 107, 086402 (2011), Proc. Natl. Acad. Sci. USA 108, 20434 (2011)], our calculations reveal that the drastic decrease of the optical reflectivity measured in the high pressure phases oP8 and tI19 [Proc. Natl. Acad. Sci. USA 106, 6525 (2009)] is associated with a new low-energy plasmon arising from collective interband excitations. Additionally, our calculations predict the existence of an anisotropic interband plasmon in the stability pressure range of fcc Na (65 to 105 GPa).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
