BEGIN:VCALENDAR VERSION:2.0 PRODID:Icfo X-PUBLISHED-TTL:P1W BEGIN:VEVENT UID:69f27be2d6f21 DTSTART:20210330T090000Z SEQUENCE:0 TRANSP:OPAQUE LOCATION:ICFO Auditorium and Online (Teams) SUMMARY:ICFO | CARLES URGELL FLORES CLASS:PUBLIC DESCRIPTION:Carbon nanotubes (CNTs) have attracted the attention of the sci entific community since their discovery in the 90s. They are an excellent material for the development of research fields as diverse as nanomechanic s or quantum transport. Nanotube\nmechanical resonators are endowed with e xceptional properties\, including extremely small mass\, ultra narrow cros ssection\, and operation over a large frequency range from 10 kHz to 10 GH z. They are also fantastic sensors of both mass adsorption and forces.\nIt s electric transport properties are remarkably the long ballistic transpor t of charge carriers\, strong electron-electron interaction\, and the impo rtant role of the spin and valley degrees of freedom. It is possible to ob serve a wide range of quantum transport phenomena ranging from single-elec tron tunneling to Kondo physics and Fabry-Pé\;rot interference. It s hould be noted that the electrical transport and mechanical motion of susp ended nanotubes can be coupled by a large amount.\nIn the first part of th is thesis\, we present an advanced ultra-sensitive fabrication method that allows us to build and functionalize a nanotube cantilever for optical me asurements. We grow a platinum particle at the end of the nanotube in orde r\nto increase laser reflection. For this\, we track the material depositi on on the cantilever through the electromechanical coupling with the elect ron beam during the process.\nNext\, we show electron transport measuremen ts in high-quality devices with high transmission. While high-temperature measurements indicate electron-electron correlations\, low-temperature tra nsport characteristics point towards singleparticle\nFabry-Perot interfere nce. We observe this effect both by modifying the temperature and by tunin g the source-drain voltage. This effect is attributed to the interplay bet ween fluctuations and quantum interactions in a correlated Fabry-Pé\ ;rot regime.\nIn the last part\, we show that it is possible to couple the mechanical movement of the CNT to the electron transport. By applying an electron current through the system\, we can either cool or amplify the me chanical motion of the eigenmode. We cooled the nanoresonator down to 4.6+ -2.0 quanta of vibration. The instabilities present in electron transport measurements are attributed to self-oscillation induced by the backaction amplification. These effects have an electrothermal origin. This method ca n be used in the future to cool NEMS into the quantum regime. DTSTAMP:20260429T214506Z END:VEVENT END:VCALENDAR