29 research outputs found
Review on Infrared Nanospectroscopy of Natural 2D Phyllosilicates
Phyllosilicates emerge as a promising class of large bandgap lamellar
insulators. Their applications have been explored from fabrication of
graphene-based devices to 2D heterostructures based on transition metal
dicalcogenides with enhanced optical and polaritonics properties. In this
review, we provide an overview on the use of IR s-SNOM for studying nano-optics
and local chemistry of a variety of 2D natural phyllosilicates. Finally, we
bring a brief update on applications that combine natural lamellar minerals
into multifunctional nanophotonic devices driven by electrical control.Comment: 11 pages, 11 fig
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Efficient phonon cascades in WSe 2 monolayers
Abstract: Energy relaxation of photo-excited charge carriers is of significant fundamental interest and crucial for the performance of monolayer transition metal dichalcogenides in optoelectronics. The primary stages of carrier relaxation affect a plethora of subsequent physical mechanisms. Here we measure light scattering and emission in tungsten diselenide monolayers close to the laser excitation energy (down to ~0.6 meV). We reveal a series of periodic maxima in the hot photoluminescence intensity, stemming from energy states higher than the A-exciton state. We find a period ~15 meV for 7 peaks below (Stokes) and 5 peaks above (anti-Stokes) the laser excitation energy, with a strong temperature dependence. These are assigned to phonon cascades, whereby carriers undergo phonon-induced transitions between real states above the free-carrier gap with a probability of radiative recombination at each step. We infer that intermediate states in the conduction band at the Λ-valley of the Brillouin zone participate in the cascade process of tungsten diselenide monolayers. This provides a fundamental understanding of the first stages of carrier–phonon interaction, useful for optoelectronic applications of layered semiconductors
Phyllosilicates as earth-abundant layered materials for electronics and optoelectronics: Prospects and challenges in their ultrathin limit
Phyllosilicate minerals are an emerging class of naturally occurring layered
insulators with large bandgap energy that have gained attention from the
scientific community. This class of lamellar materials has been recently
explored at the ultrathin two-dimensional level due to their specific
mechanical, electrical, magnetic, and optoelectronic properties, which are
crucial for engineering novel devices (including heterostructures). Due to
these properties, phyllosilicates minerals can be considered promising low-cost
nanomaterials for future applications. In this Perspective article, we will
present relevant features of these materials for their use in potential
2D-based electronic and optoelectronic applications, also discussing some of
the major challenges in working with them.Comment: 29 pages, 4 figure