Manual for conducting socioeconomic surveys through Pocket Portable Device Assistants (PDAs) and personal computers

Socioeconomic environment, Surveys, Computers, Computer software, Data collection, PDAs, Personal computers, Research Methods/ Statistical Methods, U40, E10,

IV Seminario de Dramaturgia Puertorriqueña

IV Seminario de Dramaturgia Puertorriqueñ

Nueva dramaturgia puertorriqueña

Nueva dramaturgia puertorriqueñ

La creación del Archivo Nacional de Teatro y Cine como centro fundacional de la investigación teatral y cinematográfica puertorriqueña

The Archive Nacional de Teatro y Cine del Ateneo Puertorriqueño is the country's largest theatrical and cinematographic research and documentation center: its documentary collection serves researches, postgraduate and undergraduate students, scholars and creators of these two important branches of Puerto Rican culture. In the same way it generates proper investigations which redounds in important discoveries, such as the first literary piece published in Puerto Rico, by a puertorrican, ;Mucen o el triunfo del patriotismo ;, by Celedonio Luis Nebot, written and published in San Juan in the year 1833, ten years before ;Aguinaldo Puertorriqueño ;. Also preserves documents, moving images and paperwork of theater and cinema, as well as keeping important documents and works of the 19th Century. The Archivo stands as a center of documentation, not only of two national arts, but of all our national identity.El Archivo Nacional de Teatro y Cine del Ateneo Puertorriqueño es el centro de documentación e investigación teatral y cinematográfica más importante del país. Su acervo documental sirve a investigadores, tesistas, estudiantes, académicos y creadores de estas dos importantes ramas de la cultura puertorriqueña. De la misma forma genera investigaciones propias que redundan en importantes descubrimientos, como lo fue el hallazgo de la primera obra literaria publicada en Puerto Rico por un puertorriqueño, ;Mucen o el triunfo del patriotismo ;, de Celedonio Luis Nebot, escrita y publicada en San Juan en el año de 1833, diez años antes que el ;Aguinaldo Puertorriqueño ;. Adems conserva documentos, imágenes en movimiento y papelería de los más importantes dramaturgos y actores del teatro y el cine nacionales, así como reúne importantes documentos y obras del siglo XIX. Consolídase el Archivo en un centro de documentación no solo de dos artes nacionales, sino de toda nuestra identidad nacional

Negative effective excitonic diffusion in monolayer transition metal dichalcogenides

While exciton relaxation in monolayers of transition metal dichalcogenides (TMDs) has been intensively studied, spatial exciton diffusion has received only a little attention-in spite of being a key process for optoelectronics and having already shown interesting unconventional behaviours (e.g. spatial halos). Here, we study the spatiotemporal dynamics in TMD monolayers and track optically excited excitons in time, momentum, and space. In particular, we investigate the temperature-dependent exciton diffusion including the remarkable exciton landscape constituted by bright and dark states. Based on a fully quantum mechanical approach, we show at low temperatures an unexpected negative effective diffusion characterized by a shrinking of the spatial exciton distributions. This phenomenon can be traced back to the existence of dark exciton states in TMD monolayers and is a result of an interplay between spatial exciton diffusion and intervalley exciton-phonon scattering

Formación profesional dual e inserción laboral en el área del euro

Artículo de revist

Exciton optics, dynamics, and transport in atomically thin semiconductors

Atomically thin semiconductors such as transition metal dichalcogenide (TMD) monolayers exhibit a very strong Coulomb interaction, giving rise to a rich exciton landscape. This makes these materials highly attractive for efficient and tunable optoelectronic devices. In this Research Update, we review the recent progress in the understanding of exciton optics, dynamics, and transport, which crucially govern the operation of TMD-based devices. We highlight the impact of hexagonal boron nitride-encapsulation, which reveals a plethora of many-particle states in optical spectra, and we outline the most novel breakthroughs in the field of exciton-polaritonics. Moreover, we underline the direct observation of exciton formation and thermalization in TMD monolayers and heterostructures in recent time-resolved, angle-resolved photoemission spectroscopy studies. We also show the impact of exciton density, strain, and dielectric environment on exciton diffusion and funneling. Finally, we put forward relevant research directions in the field of atomically thin semiconductors for the near future

Strain-dependent exciton diffusion in transition metal dichalcogenides

Monolayers of transition metal dichalcogenides have a remarkable excitonic landscape with deeply bound bright and dark exciton states. Their properties are strongly affected by lattice distortions that can be created in a controlled way via strain. Here, we perform a joint theory-experiment study investigating exciton diffusion in strained tungsten disulfide (WS2) monolayers. We reveal a non-trivial and non-monotonic influence of strain. Lattice deformations give rise to different energy shifts for bright and dark excitons changing the excitonic landscape, the efficiency of intervalley scattering channels and the weight of single exciton species to the overall exciton diffusion. We predict a minimal diffusion coefficient in unstrained WS2 followed by a steep speed-up by a factor of 3 for tensile biaxial strain at about 0.6% strain - in excellent agreement with our experiments. The obtained microscopic insights on the impact of strain on exciton diffusion are applicable to a broad class of multi-valley 2D materials

Exciton propagation and halo formation in two-dimensional materials

The interplay of optics, dynamics and transport is crucial for the design of novel optoelectronic devices, such as photodetectors and solar cells. In this context, transition metal dichalcogenides (TMDs) have received much attention. Here, strongly bound excitons dominate optical excitation, carrier dynamics and diffusion processes. While the first two have been intensively studied, there is a lack of fundamental understanding of non-equilibrium phenomena associated with exciton transport that is of central importance e.g. for high efficiency light harvesting. In this work, we provide microscopic insights into the interplay of exciton propagation and many-particle interactions in TMDs. Based on a fully quantum mechanical approach and in excellent agreement with photoluminescence measurements, we show that Auger recombination and emission of hot phonons act as a heating mechanism giving rise to strong spatial gradients in excitonic temperature. The resulting thermal drift leads to an unconventional exciton diffusion characterized by spatial exciton halos