Temperature dependence of the dielectric function of monolayer MoS₂

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>An analytic expression of the dielectric function of monolayer molybdenum disulfide (MoS<SUB>2</SUB>) <I>ε</I> = <I>ε</I> <SUB>1</SUB> + <I>iε</I> <SUB>2</SUB> is presented for energies from 1.4 to 6.0 eV and temperatures from 35 to 350 K. The dielectric function parametric model is used to express <I>ε</I> as a sum of polynomials, which naturally includes asymmetry of critical-point lineshapes. The temperature dependence is achieved by fitting model parameters. In this way, the dielectric function of MoS<SUB>2</SUB> for arbitrary temperature can be calculated. We observed the fundamental absorption peak, which occurs at the <I>K</I> point of the Brillouin zone. These results are expected to be useful in designing and understanding applied-device technologies based on monolayer MoS<SUB>2</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We successfully reconstructed the dielectric function of monolayer MoS<SUB>2</SUB> using parametric model. </LI> <LI> We observe the fundamental absorption peak, which occurs at the <I>K</I> point of the Brillouin zone. </LI> <LI> We obtain the temperature dependence of the dielectric function of monolayer MoS<SUB>2</SUB> from 35 to 350 K. </LI> <LI> We use a cubic polynomial to interpolate the dielectric function of monolayer MoS<SUB>2</SUB> at arbitrary temperatures. </LI> <LI> These results enable the development of potentially important devices based on monolayer MoS<SUB>2</SUB>. </LI> </UL> </P>