Direct Measurement of the Tunable Electronic Structure of Bilayer MoS 2 by Interlayer Twist

Yeh, Po-Chun; Jin, Wencan; Zaki, Nader; Kunstmann, Jens; Chenet, Daniel; Arefe, Ghidewon; Sadowski, Jerzy T.; Dadap, Jerry I.; Sutter, Peter; Hone, James; Osgood, Richard M.

doi:10.1021/acs.nanolett.5b03883

Title: Direct Measurement of the Tunable Electronic Structure of Bilayer MoS ₂ by Interlayer Twist

Journal Article · Wed Jan 13 00:00:00 EST 2016 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.5b03883· OSTI ID:1354330

Yeh, Po-Chun; Jin, Wencan; Zaki, Nader; Kunstmann, Jens; Chenet, Daniel; Arefe, Ghidewon; Sadowski, Jerzy T.; Dadap, Jerry I.; Sutter, Peter; Hone, James; Osgood, Richard M.

Using angle-resolved photoemission on micrometer-scale sample areas, we directly measure the interlayer twist angle-dependent electronic band structure of bilayer molybdenum-disulfide (MoS₂). Our measurements, performed on arbitrarily stacked bilayer MoS₂ flakes prepared by chemical vapor deposition, provide direct evidence for a downshift of the quasiparticle energy of the valence band at the Brillouin zone center ($$\bar{Γ}$$ point) with the interlayer twist angle, up to a maximum of 120 meV at a twist angle of ~40°. Our direct measurements of the valence band structure enable the extraction of the hole effective mass as a function of the interlayer twist angle. While our results at $$\bar{Γ}$$agree with recently published photoluminescence data, our measurements of the quasiparticle spectrum over the full 2D Brillouin zone reveal a richer and more complicated change in the electronic structure than previously theoretically predicted. The electronic structure measurements reported here, including the evolution of the effective mass with twist-angle, provide new insight into the physics of twisted transition-metal dichalcogenide bilayers and serve as a guide for the practical design of MoS₂ optoelectronic and spin-/valley-tronic devices.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Re-Defining Photovoltaic Efficiency Through Molecule Scale Control (RPEMSC); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: SC00112704

OSTI ID:: 1354330

Report Number(s):: BNL-112846-2016-JA

Journal Information:: Nano Letters, Vol. 16, Issue 2; ISSN 1530-6984

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

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