Low-energy dielectric screening in Pd and PdHx systems

Vyacheslav Mikhaylovich Silkin, V. U. Nazarov, I. P. Chernov, I. Yu Sklyadneva, E. V. Chulkov

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Modifications in dielectric properties of palladium upon absorption of hydrogen are investigated theoretically in the low-energy (0-2eV) region. The calculations were performed with full inclusion of the electronic band structure obtained within a self-consistent pseudopotential approach. In particular, we trace the evolution of the acoustic-like plasmon (AP) found previously in clean Pd with increasing hydrogen concentration. It exists in PdHx up to the hydrogen content x corresponding to the complete filling of the 4d Pd-derived energy bands because of the presence of two kinds of carriers at the Fermi surface. At higher H concentration the AP disappears since only one kind of carrier within the sp-like energy band exists at the Fermi level. Additionally, we investigate the spatial distribution inside the crystal of a potential caused by a time-dependent external perturbation and observe drastic modifications in the screening properties in the PdHx systems with energy and with hydrogen concentration.

Original languageEnglish
Article number055501
JournalJournal of Physics Condensed Matter
Volume27
Issue number5
DOIs
Publication statusPublished - 11 Feb 2015

Fingerprint

Hydrogen
Screening
screening
Band structure
hydrogen
energy bands
Acoustics
Fermi surface
acoustics
energy
Palladium
Fermi level
Dielectric properties
Spatial distribution
pseudopotentials
Fermi surfaces
dielectric properties
palladium
spatial distribution
inclusions

Keywords

  • collective electronic excitations
  • palladium
  • palladium hydrides

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)

Cite this

Low-energy dielectric screening in Pd and PdHx systems. / Silkin, Vyacheslav Mikhaylovich; Nazarov, V. U.; Chernov, I. P.; Sklyadneva, I. Yu; Chulkov, E. V.

In: Journal of Physics Condensed Matter, Vol. 27, No. 5, 055501, 11.02.2015.

Research output: Contribution to journalArticle

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AU - Nazarov, V. U.

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AU - Chulkov, E. V.

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