TY - JOUR
T1 - Measurement of the surface susceptibility and the surface conductivity of atomically thin MoS2 by spectroscopic ellipsometry
AU - Jayaswal, Gaurav
AU - Dai, Zhenyu
AU - Zhang, Xixiang
AU - Bagnarol, Mirko
AU - Martucci, Alessandro
AU - Merano, Michele
N1 - KAUST Repository Item: Exported on 2020-04-23
Acknowledgements: Funding: Università degli Studi di Padova (BIRD170839/17). Acknowledgment: M. M. gratefully acknowledges the support from Dipartimento di Fisica e Astronomia G. Galilei, Università Degli Studi di Padova. M. M. conceived the idea and wrote the Letter. G. J. and Z. D. prepared the sample under the supervision of X. Z. Measurements and data analysis were done by M. B., M. M., and A. M.
PY - 2018/2/7
Y1 - 2018/2/7
N2 - We show how to correctly extract from the ellipsometric data the surface susceptibility and the surface conductivity that describe the optical properties of monolayer $\rm MoS_2$. Theoretically, these parameters stem from modelling a single-layer two-dimensional crystal as a surface current, a truly two-dimensional model. Currently experimental practice is to consider this model equivalent to a homogeneous slab with an effective thickness given by the interlayer spacing of the exfoliating bulk material. We prove that the error in the evaluation of the surface susceptibility of monolayer $\rm MoS_2$, owing to the use of the slab model, is at least 10% or greater, a significant discrepancy in the determination of the optical properties of this material.
AB - We show how to correctly extract from the ellipsometric data the surface susceptibility and the surface conductivity that describe the optical properties of monolayer $\rm MoS_2$. Theoretically, these parameters stem from modelling a single-layer two-dimensional crystal as a surface current, a truly two-dimensional model. Currently experimental practice is to consider this model equivalent to a homogeneous slab with an effective thickness given by the interlayer spacing of the exfoliating bulk material. We prove that the error in the evaluation of the surface susceptibility of monolayer $\rm MoS_2$, owing to the use of the slab model, is at least 10% or greater, a significant discrepancy in the determination of the optical properties of this material.
UR - http://hdl.handle.net/10754/626513
UR - https://www.osapublishing.org/ol/abstract.cfm?uri=ol-43-4-703
UR - http://www.scopus.com/inward/record.url?scp=85042086009&partnerID=8YFLogxK
U2 - 10.1364/OL.43.000703
DO - 10.1364/OL.43.000703
M3 - Article
C2 - 29444057
SN - 0146-9592
VL - 43
SP - 703
JO - Optics Letters
JF - Optics Letters
IS - 4
ER -