We present our results on trapping a tunable number of interlayer excitons (IX) within a nanoscale confinement potential induced by placing a MoSe2-WSe2 hetero-bilayer onto an array of nanopillars. The mean occupation of the IX trap is controlled via the optical excitation level and discrete sharp-line emission from different configurations of interacting IXs is observed. The intensities of these features exhibit characteristic near linear, quadratic, cubic and quartic power dependencies, which allows us to identify them as different multiparticle configurations of 1-4 IX and we directly measure the hierarchy of dipolar and exchange interactions as the number of increases.

Date Published: 10 March 2020
PDF
Proc. SPIE 11282, 2D Photonic Materials and Devices III, 1128208 (10 March 2020); doi: 10.1117/12.2548196

Published in SPIE Proceedings Vol. 11282:
2D Photonic Materials and Devices III
Arka Majumdar; Carlos M. Torres Jr.; Hui Deng, Editor(s)