Direct observation of strain-induced orbital valence band splitting in HfSe2 by sodium intercalation
| Autor: | Warakorn Jindata, S. Siriroj, Sangeeta Thakur, T. Eknapakul, S. Chaiyachad, Luca Petaccia, Ittipon Fongkaew, Sung-Kwan Mo, Worawat Meevasana, H. Takagi, Sukit Limpijumnong |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Photoemission spectroscopy Sodium Fluids & Plasmas Intercalation (chemistry) chemistry.chemical_element FOS: Physical sciences Angle-resolved photoemission spectroscopy 02 engineering and technology Electronic structure 01 natural sciences Condensed Matter::Materials Science Engineering Condensed Matter::Superconductivity 0103 physical sciences 010306 general physics Condensed Matter - Materials Science Valence (chemistry) Condensed matter physics Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology chemistry Physical Sciences Chemical Sciences Density functional theory Direct and indirect band gaps 0210 nano-technology |
| Zdroj: | Eknapakul, T; Fongkaew, I; Siriroj, S; Jindata, W; Chaiyachad, S; Mo, SK; et al.(2018). Direct observation of strain-induced orbital valence band splitting in HfSe2 by sodium intercalation. Physical Review B, 97(20). doi: 10.1103/PhysRevB.97.201104. Lawrence Berkeley National Laboratory: Retrieved from: http://www.escholarship.org/uc/item/9vn7q75h Physical Review B, vol 97, iss 20 |
| Popis: | By using angle-resolved photoemission spectroscopy (ARPES), the variation of the electronic structure of HfSe$_2$ has been studied as a function of sodium intercalation. We observe how this drives a band splitting of the p-orbital valence bands and a simultaneous reduction of the indirect band gap by values of up to 400 and 280 meV respectively. Our calculations indicate that such behaviour is driven by the band deformation potential, which is a result of our observed anisotropic strain induced by sodium intercalation. The applied uniaxial strain calculations based on density functional theory (DFT) agree strongly with the experimental ARPES data. These findings should assist in studying the physical relationship between doping and strain, as well as for large-scale two-dimensional straintronics. Comment: 6 pages, 4 figures |
| Databáze: | OpenAIRE |
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