nl0c01789_si_001.pdf (2.19 MB)
Creation of Single-Photon Emitters in WSe2 Monolayers Using Nanometer-Sized Gold Tips
journal contribution
posted on 2020-07-16, 18:33 authored by Lintao Peng, Henry Chan, Priscilla Choo, Teri W. Odom, Subramanian K.
R. S. Sankaranarayanan, Xuedan MaDue
to their tunable bandgaps and strong spin-valley locking, transition
metal dichalcogenides constitute a unique platform for hosting single-photon
emitters. Here, we present a versatile approach for creating bright
single-photon emitters in WSe2 monolayers by the deposition
of gold nanostars. Our molecular dynamics simulations reveal that
the formation of the quantum emitters is likely caused by the highly
localized strain fields created by the sharp tips of the gold nanostars.
The surface plasmon modes supported by the gold nanostars can change
the local electromagnetic fields in the vicinity of the quantum emitters,
leading to their enhanced emission intensities. Moreover, by correlating
the emission energies and intensities of the quantum emitters, we
are able to associate them with two types of strain fields and derive
the existence of a low-lying dark state in their electronic structures.
Our findings are highly relevant for the development and understanding
of single-photon emitters in transition metal dichalcogenide materials.