Bulletin of the American Physical Society
APS March Meeting 2021
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session B57: 2D Semiconductors: Photonics and Optoelectronics
11:30 AM–2:30 PM,
Monday, March 15, 2021
Sponsoring Unit: DMP
Chair: Nicholas Borys, Lawrence Berkeley National Laboratory
Abstract: B57.00010 : First-principles spectroscopy of multiparticle excitations in low-dimensional materials*
1:42 PM–2:18 PM
We first discuss plasmons in metallic monolayer TMDCs and predict that they are long-lived and display a unique and universal dispersion not found in the ideal 2D electron gas due to the broken continuous translational symmetry. Such plasmons can also support a giant enhancement of the electric field intensity of the order of 107 and serve as platforms for practical applications involving light-matter interactions, such as photocatalysis. For semiconducting monolayer TMDCs, our parameter-free formalism and calculations elucidate the nature of strongly bound biexcitons in such systems. Such biexcitons, with a computed binding energy of ~ 20 meV, display a nontrivial wavefunction in reciprocal space. Finally, we also discuss how exciton-exciton interaction can be used to understand ultrafast exciton dynamics in few-layer TMDCs, which were recently reported in time-resolved spectroscopy experiments.
*This work was supported by the Center for Computational Study of Excited-State Phenomena in Energy Materials at LBNL, funded by the U.S. DOE under Contract No. DE-AC02-05CH11231. This research used resources of the National Energy Research Scientific Computing Center, operated under Contract No. DE-AC02-05CH11231, and of the Oak Ridge Leadership Computing Facility, operated under Contract No. DE-AC05-00OR22725.
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