Kausik Majumdar1,Medha Dandu2,Pushkar Dasika1,Garima Gupta1,Mayank Chhaperwal1,Rabindra Biswas1,Kenji Watanabe3,Takashi Taniguchi3,Varun Raghunathan1,Suman Chatterjee1
Indian Institute of Science1,Lawrence Berkeley National Laboratory2,National Institute for Materials Science3
Kausik Majumdar1,Medha Dandu2,Pushkar Dasika1,Garima Gupta1,Mayank Chhaperwal1,Rabindra Biswas1,Kenji Watanabe3,Takashi Taniguchi3,Varun Raghunathan1,Suman Chatterjee1
Indian Institute of Science1,Lawrence Berkeley National Laboratory2,National Institute for Materials Science3
Moiré superlattice created by stacking two monolayers of transition metal dichalcogenides at different twist angles is an excellent testbed for exciton physics. In this work, we explore dynamic tuning of the moiré excitons through external stimulus in different moiré configurations, including homo-bilayer, hetero-bilayer, and hetero-bilayer on a nanopillar-induced strain well. We specifically show a large tunability of the confinement potential, spectral position, lifetime, and polarization characteristics of the exciton in these different types of moiré-superlattices under the influence of a gate voltage and excitation power. The experimental results corroborate well with a tunable two-dimensional quasi-harmonic oscillator model for the moiré-trapped exciton. Such strong tunability of moiré exciton has intriguing implications towards moiré-inspired device applications.