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El próximo jueves 7/3 a las 14hs realizamos el primer coloquio DF de este<br>
año,<br>
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COLOQUIOS DEL DEPARTAMENTO DE FÍSICA FCEYN - UBA<br>
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En el Aula Seminario, 2do piso, Pab. I, <br>
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Jueves 7/3, 14hs:<br>
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Bernard Jusserand<br>
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<h4 style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; font-size: 13px; color: rgb(120, 120, 120); font-family: arial, helvetica, sans-serif; text-align: left; background-color: rgb(255, 255, 255);">Institut des Nanosciences de Paris, UPMC-CNRS.</h4>
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<h2 style="margin-top: 0px; margin-right: 0px; margin-bottom: 10px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 12px; padding-left: 0px; font-size: 18px; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(221, 221, 221); color: rgb(12, 124, 136); font-family: 'Titillium Maps', Arial; text-align: left; background-color: rgb(255, 255, 255);">Son et lumière : A combined engineering of photons and acoustic phonons in semiconductor nanostructures</h2>
<p style="margin-top: 8px; margin-right: 0px; margin-bottom: 8px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; line-height: 1.7em; color: rgb(120, 120, 120); font-family: arial, helvetica, sans-serif; font-size: 13px; text-align: left; background-color: rgb(255, 255, 255);"><span lang="en-US" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; text-align: justify; text-indent: 47px;">Abstract:<br>
S</span><span lang="en-US" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; text-align: justify; text-indent: 47px;">emiconductor superlattices are periodic stacks of two different materials, such as GaAs and AlAs, well known for their novel electronic and photonic properties. In this talk, I will present the ideas which we developed in the past years, how to transfer the same ideas to the field of acoustic phonons in multilayers. I will recall the concepts of folded acoustic phonon in a periodic multilayer stack and of cavity phonons in a novel device: the acoustic nanocavity.</span></p>
<p align="justify" style="margin-top: 8px; margin-right: 0px; margin-bottom: 0in; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; line-height: 1.7em; color: rgb(120, 120, 120); font-family: arial, helvetica, sans-serif; font-size: 13px; background-color: rgb(255, 255, 255); text-indent: 0.49in;"><span lang="en-US" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">Using pump-probe and Raman scattering experiments, w</span><span lang="en-US" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">e have demonstrated that the acoustic nanodevices are very efficient generators and detectors of quasi-monochromatic acoustic wave packets up to frequencies around 1 THz and that their properties can be widely engineered by adjusting the devices parameters and the transduction wavelength. High resolution Raman scattering (10</span><sup style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;"><span lang="en-US" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">-2</span></sup><span lang="en-US" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;"> cm</span><sup style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;"><span lang="en-US" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">-1</span></sup><span lang="en-US" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">) also allowed us to determine the lifetime of acoustic phonons confined in nanocavities.</span></p>
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