2020/05/05 by Alejandro R.‐P. Montblanch, Montblanch, Alejandro R. -P., Dhiren M. Kara +29 · 3 citations
Materials Science · Physics and Astronomy · #2D Materials and Applications #Spectroscopy and Quantum Chemical Studies #Semiconductor Quantum Structures and Devices
paper · pdf · doi:10.48550/arxiv.2005.02416
Interlayer excitons in layered materials constitute a novel platform to study\nmany-body phenomena arising from long-range interactions between quantum\nparticles. The ability to localise individual interlayer excitons in potential\nenergy traps is a key step towards simulating Hubbard physics in artificial\nlattices. Here, we demonstrate spatial localisation of long-lived interlayer\nexcitons in a strongly confining trap array using a WS2/WSe2\nheterostructure on a nanopatterned substrate. We detect long-lived interlayer\nexcitons with lifetime approaching 0.2 ms and show that their confinement\nresults in a reduced lifetime in the microsecond range and stronger emission\nrate with sustained optical selection rules. The combination of a permanent\ndipole moment, spatial confinement and long lifetime places interlayer excitons\nin a regime that satisfies one of the requirements for observing long-range\ndynamics in an optically resolvable trap lattice.\n