TEMPERATURE-DEPENDENT PHOTOLUMINESCENCE STUDIES OF TMDC HETEROBILAYERS: TOWARDS MOIRE EXCITONS The discovery of superconductivity in the twisted graphene bilayers with a 1.1-degree twist angle (the magic angle), has led to a significant interest in twisted 2D material.1 On twisting two transition metal dichalcogenide (TMDC) mono-layers relative to one another, the natural periodic potential arising from the atomic cores can be altered, and the new periodicity gives rise to the Moire potentials.2 Optically, it manifests as the fine splitting in the photoluminescence (PL) spectra.3 Since the lattice mismatch condition is relaxed in these Van der Waals materials, it provides an efficient and relatively simple approach for tuning the band properties of emergent TMDC heterostructures.4 In the present work, we present the study of temperature-dependent PL in three bilayer systems, namely: MoWSe2/MoSe2, MoS2/MoSe2 and in near-zero degree twisted MoSe2/MoSe2 homo-bilayer. From a detailed analysis, we extract the temperature-dependent parameters of these heterostructures. The MoSe2/MoSe2 zero-degree twisted bilayer exhibits optical features pointing towards the Moire excitons. Future pump-probe transient reflectance studies will shed light on the Moire exciton dynamics in these twisted bilayer systems. References: 1. Devakul, Trithep, et al. "Magic in twisted transition metal dichalcogenide bilayers." Nature communications 12.1 (2021): 6730. 2. Marcellina, Elizabeth, et al. "Evidence for moiré trions in twisted MoSe2 homobilayers." Nano Letters 21.10 (2021): 4461-4468. 3. Zhang, Nan, et al. "Moiré intralayer excitons in a MoSe2/MoS2 heterostructure." Nano letters 18.12 (2018): 7651-7657. 4. Villafañe, Viviana, et al. "Twist-Dependent Intra-and Interlayer Excitons in Moiré MoSe2 Homobilayers." Physical Review Letters 130.2 (2023): 026901.