Electrically driven cascaded photon-emission in a single molecule
arxiv(2024)
Abstract
Controlling electrically-stimulated quantum light sources (QLS) is key for
developing integrated and low-scale quantum devices. The mechanisms leading to
quantum emission are complex, as a large number of electronic states of the
system impacts the emission dynamics. Here, we use a scanning tunneling
microscope (STM) to excite a model QLS, namely a single molecule. The
luminescence spectra reveal two lines, associated to the emission of the
neutral and positively charged molecule, both exhibiting single-photon source
behavior. In addition, we find a correlation between the charged and neutral
molecule's emission, the signature of a photon cascade. By adjusting the
charging/discharging rate, we can control these emission statistics. This
generic strategy is further established by a rate equation model revealing the
complex internal dynamics of the molecular junction.
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