Direct observation of strain-induced orbital valence band splitting in HfSe2 by sodium intercalation

Eknapakul, T.; Fongkaew, I.; Siriroj, S.; Jindata, W.; Chaiyachad, S.; Mo, S. -K.; Thakur, S.; Petaccia, L.; Takagi, H.; Limpijumnong, S.; Meevasana, W.

doi:10.1103/PhysRevB.97.201104

Title: Direct observation of strain-induced orbital valence band splitting in HfSe2 by sodium intercalation

Journal Article · 06 May 2018 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.97.201104 · OSTI ID:1571102

Eknapakul, T. ^[1]; Fongkaew, I. ^[1]; Siriroj, S. ^[1]; Jindata, W. ^[1]; Chaiyachad, S. ^[1]; Mo, S. -K. ^[2]; Thakur, S. ^[3]; Petaccia, L. ^[3]; Takagi, H. ^[4]; Limpijumnong, S. ^[5]; Meevasana, W. ^[5]

Suranaree Univ. of Technology, Nakhon Ratchasima (Thailand). School of Physics
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Elettra Sincrotrone Trieste, Trieste (Italy)
Univ. of Tokyo, Tokyo (Japan). Dept. of Physics; Max-Planck Inst. for Solid States Research, Stuttgart (Germany)
Suranaree Univ. of Technology, Nakhon Ratchasima (Thailand). School of Physics, and NANOTEC-SUT Center of Excellence on Advanced Functional Nanomaterials

By using angle-resolved photoemission spectroscopy (ARPES), the variation of the electronic structure of HfSe₂ 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 behavior is driven by the band deformation potential, which is a result of our observed strain induced by sodium intercalation. The applied uniaxial strain calculations based on density functional theory agree strongly with the experimental ARPES data. Finally, these findings should assist in studying the physical relationship between intercalation and strain, as well as for large-scale two-dimensional straintronics.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division (SC-22.3 )

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1571102

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 20 Vol. 97; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Direct observation of strain-induced orbital valence band splitting in HfSe2 by sodium intercalation

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