Band-gap expansion in the surface-localized electronic structure of MoS${}_{2}$(0002)

Band-gap expansion in the surface-localized electronic structure of MoS $_{2}$ (0002)

Sang Wook Han, Gi-Beom Cha, Emmanouil Frantzeskakis, Ivy Razado-Colambo, José Avila, Young S. Park, Daehyun Kim, Jihoon Hwang, Jeong Soo Kang, Sunmin Ryu, Won Seok Yun, Soon Cheol Hong, and Maria C. Asensio

Phys. Rev. B 86, 115105 – Published 6 September 2012

Abstract

The electronic band structure of MoS $_{2}$ single crystals has been investigated using angle-resolved photoelectron spectroscopy and first-principles calculations. The orbital symmetry and $k$ dispersion of these electronic states responsible for the direct and the indirect electronic band gaps have been unambiguously determined. By experimentally probing an increase of the electronic band gap, we conclude that a MoS $_{2}$ (0002) surface localized state exists just below the valence band maximum at the $Γ$ point. This electronic state originates from the sulfur planes within the topmost layer. Our comprehensive study addresses the surface electronic structure of MoS $_{2}$ and the role of van der Waals interlayer interactions.

Received 5 January 2012

DOI:https://doi.org/10.1103/PhysRevB.86.115105

Authors & Affiliations

Sang Wook Han¹, Gi-Beom Cha^2,*, Emmanouil Frantzeskakis³, Ivy Razado-Colambo³, José Avila³, Young S. Park⁴, Daehyun Kim⁵, Jihoon Hwang⁵, Jeong Soo Kang⁵, Sunmin Ryu⁶, Won Seok Yun^1,†, Soon Cheol Hong^1,‡, and Maria C. Asensio^3,§

¹Department of Physics and Energy Harvest-Storage Research Center, University of Ulsan, Ulsan 680-749, Korea
²Dongnae School, San 7-1, Bugok-dong, Geumjeon-gu, Busan 609-719, Korea
³Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin-BP 48, 91192 Gif sur Yvette Cedex, France
⁴Center for Superfunctional Materials, Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Korea
⁵Department of Physics, The Catholic University of Korea, Bucheon 420-743, Korea
⁶Department of Applied Chemistry, Kyung Hee University, Yongin, Gyeonggi 446-701, Korea

^*Present address: Dongnae Girls' School, San 7-1, Bugok-dong, Geumjeon-gu, Busan 609-719, Korea.
^†Present address: Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang 790-784, Korea.
^‡schong@ulsan.ac.kr
^§asensio@synchrotron-soleil.fr

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Issue

Vol. 86, Iss. 11 — 15 September 2012

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Physical Review B

covering condensed matter and materials physics