%0 Journal Article
%T Temperature dependence of the dielectric function and critical points of monolayer WSe2.
%A Nguyen XA
%A Le LV
%A Kim SH
%A Kim YD
%A Diware MS
%A Kim TJ
%A Kim YD
%J Sci Rep
%V 14
%N 1
%D 2024 Jun 12
%M 38866902
%F 4.996
%R 10.1038/s41598-024-64303-1
%X Monolayer materials typically display intriguing temperature-dependent dielectric and optical properties, which are crucial for improving the structure and functionality of associated devices. Due to its unique photoelectric capabilities, monolayer WSe2 has recently received a lot of attention in the fields of atomically thin electronics and optoelectronics. In this work, we focus on the evolution of the temperature-dependent dielectric function (ε = ε1 + i ε2) of monolayer WSe2 over energies from 0.74 to 6.40 eV and temperatures from 40 to 350 K. We analyze the second derivatives of ε with respect to energy to accurately locate the critical points (CP). The dependence of the observed CP energies on temperature is consistent with the alternative domination of the declining exciton binding energy as the temperature increases.