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Banco de Trabajos

Phonons in 2D magnetic materialsValid until: 2024-07-30
Phonons - the quantization of crystal lattice vibrations - are involved in all electrical, magnetic, thermal and optical phenomena in materials. Two-dimensional systems have recently opened up exciting opportunities to tune the phonon energy spectrum and related material properties for different specific applications. In this project, the phonon band structure of the layered compounds CrI3, Cr2I2, CrCl3 and FePS3, which are systems with different magnetic behaviors, will be calculated. From these DFT calculations, the extent to which magnetism modifies the phonons will be explored and their thermodynamic properties will be calculated.
Contact: MEJIA LOPEZ, JOSE FELIX
 
Atomic and electronic structure of CrCl3 and Cr2I2 monolayer Valid until: 2022-08-08
Since graphene was obtained as a clean 2D material with a repetitive process in 2004, the processes of synthesis and manufacture of two-dimensional materials has developed considerably increasing the opportunity of exploring phenomena in two dimensions as well as possible applications in nanodevices given their exotic properties. In this project, DFT calculations of electronic and magnetic properties, and band structures of CrCl3 and Cr2I2 monolayers will be performed to understand the mechanisms leading to different magnetic couplings in these systems.
Contact: MEJIA LOPEZ, JOSE FELIX
 
Implementation of an optical Thomson scattering system to measure plasma parametersValid until: 2021-10-31
We recently bought a 1J laser (532nm) to implement a Thomson scattering diagnostic in Llampudken to measure plasma velocity, ion and electron temperature, density, among other parameters. It its an advanced plasma diagnostics and it involves optical spectroscopy and strong data analysis and modeling skills.
Contact: VALENZUELA AHUMADA, JULIO
 
gas-puff experiments on llampudken generatorValid until: 2021-10-31
gas-puff is an experiment where a gas column is compressed by an intense current pulse to produce high density and temperature matter. In this work we want to study the effect of the initial plasma conditions on the development of instabilities while the column is imploding and its impact on the final plasma parameters. High temperature-density plasma is necessary to achieve the conditions needed for thermonuclear fusion or produce high yield X-ray emission from the plasma.
Contact: VALENZUELA AHUMADA, JULIO
 
Creation of carbon defects in hexagonal Boron Nitride IIValid until: 2021-08-15
We need a student to work with an implanter in order to create via direct or indirect implantation, carbon defects in single layer hexagonal Boron Nitride.
Contact: MAZE RIOS, JERONIMO
 
Laboratory astrophysics using pulsed power plasmasValid until: 0000-00-00
Several astrophysical environments can be both mimicked and studied in controlled laboratory plasma experiments. In particular, the emission of jets observed in young stellar objects in the form of Herbig-Haro objects, and different collisionality regimes such as those observed in supernovae remnants, accretion disks (amongst many others) can be studied using wire-based Z-pinches, laser-produced plasmas and/or combination of them. This job proposal relates to hands-on experimental plasma physics and it will be adequated according to educational level, backgrounds, personal interests and so on. Funding is available through projects AstroPALS: ASTROphysical Plasmas At Laboratory Scale funded by QUIMAL and Fondecyts projects.
Contact: VELOSO ESPINOSA, FELIPE
 
Applications of outflows emitted by wire-based Z-pinchesValid until: 0000-00-00
Wire-based Z-pinches are pulsed plasma experiments where huge electrical currents (~hundreds of kA) ablate thin metallic wires toward high density plasma whose dynamics is given by the global Lorentz force of the configuration. This job proposal concentrate in the production and applications of outflows from different wire-based Z-pinch configurations. In particular, recent studies have indicated that conical wire array Z-pinches emits two types of axial outflows: a dense plasma jet and energetic charged particles. Even though the origin of charged particle emissions remains unknown, part of this project is aimed to understand such emission and to study these outflows for applications in both laboratory astrophysics and material science.
Contact: VELOSO ESPINOSA, FELIPE
 
velocity measurements of supersonic plasma jets produced by a conical wire array on llampudken generator: applications to Lab AstroValid until: 0000-00-00
The interaction of supersonic plasma flows is important not only in the laboratory but also and in the Universe, e.g. HH objects and supernova remnants. One of the key parameters to determine whether the interaction is collisional or collisionless is the plasma velocity, as the interaction mean-free-path goes as v^4. Therefore, precise measurement of this parameter in the laboratory is very important to understand the physics of the interaction. In this work, we will use Thomson scattering to measure the velocity of plasma jets produced by a conical wire array driven by the Llampudken generator.
Contact: VALENZUELA AHUMADA, JULIO
 
Development of novel molecular sensors based on perovskite ferroelectricsValid until: 0000-00-00
Use of thin films characterization techniques such as X-ray diffraction (grazing incidence and reflectometry), AFM, SEM, EDS, XPS, adhesion and tribological tests; high vacuum techniques such as thermal desorption and residual gas analysis; and ferroelectric testing techniques such as hysteresis loops, IV, QV and CV curves.
Contact: RAMOS MOORE, ESTEBAN
 
Interdisciplinary study of the effects of surface texturing on bacterial colonization processesValid until: 0000-00-00
Use of MD simulations, litographic and etching techniques in clean room conditions, surface characterizacion techniques, functionalized-AFM adhesion and epifluorescence experiments
Contact: RAMOS MOORE, ESTEBAN
 
Interdisciplinary study of residual and thermal stresses in nanocrystalline wear-resistant coatings fabricated by chemical vapor deposition (CVD) methodsValid until: 0000-00-00
Use of CVD techniques, material characterization techniques, x-ray stress analysis, mechanical and tribological tests.
Contact: RAMOS MOORE, ESTEBAN