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

Abstract

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.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [3];  [4];  [5];  [5]
  1. Suranaree Univ. of Technology, Nakhon Ratchasima (Thailand). School of Physics
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  3. Elettra Sincrotrone Trieste, Trieste (Italy)
  4. Univ. of Tokyo, Tokyo (Japan). Dept. of Physics; Max-Planck Inst. for Solid States Research, Stuttgart (Germany)
  5. Suranaree Univ. of Technology, Nakhon Ratchasima (Thailand). School of Physics, and NANOTEC-SUT Center of Excellence on Advanced Functional Nanomaterials
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division (SC-22.3 ); USDOE
OSTI Identifier:
1571102
Alternate Identifier(s):
OSTI ID: 1436201
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 20; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; alkali metal intercalation; layered-transition metal dichalcogenides; HfSe2; band deformation; angle-resolved photoemission spectroscopy; density functional theory

Citation Formats

Eknapakul, T., Fongkaew, I., Siriroj, S., Jindata, W., Chaiyachad, S., Mo, S. -K., Thakur, S., Petaccia, L., Takagi, H., Limpijumnong, S., and Meevasana, W. Direct observation of strain-induced orbital valence band splitting in HfSe2 by sodium intercalation. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.201104.
Eknapakul, T., Fongkaew, I., Siriroj, S., Jindata, W., Chaiyachad, S., Mo, S. -K., Thakur, S., Petaccia, L., Takagi, H., Limpijumnong, S., & Meevasana, W. Direct observation of strain-induced orbital valence band splitting in HfSe2 by sodium intercalation. United States. doi:10.1103/PhysRevB.97.201104.
Eknapakul, T., Fongkaew, I., Siriroj, S., Jindata, W., Chaiyachad, S., Mo, S. -K., Thakur, S., Petaccia, L., Takagi, H., Limpijumnong, S., and Meevasana, W. Mon . "Direct observation of strain-induced orbital valence band splitting in HfSe2 by sodium intercalation". United States. doi:10.1103/PhysRevB.97.201104. https://www.osti.gov/servlets/purl/1571102.
@article{osti_1571102,
title = {Direct observation of strain-induced orbital valence band splitting in HfSe2 by sodium intercalation},
author = {Eknapakul, T. and Fongkaew, I. and Siriroj, S. and Jindata, W. and Chaiyachad, S. and Mo, S. -K. and Thakur, S. and Petaccia, L. and Takagi, H. and Limpijumnong, S. and Meevasana, W.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.97.201104},
journal = {Physical Review B},
number = 20,
volume = 97,
place = {United States},
year = {2018},
month = {5}
}

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