182 citations · 1.1k across the 19 of their papers we have counts for
19 papers
Phonon dynamics and thermal conductivity of PtSe2 thin films: Impact of crystallinity and film thickness on heat dissipation
Alexandros El Sachat, Peng Xiao, Davide Donadio +11
We present a comparative investigation of the influence of crystallinity and film thickness on the acoustic and thermal properties of 2D layered PtSe2 thin films of varying thickne…
Fracturing of polycrystalline MoS nanofilms
M. Sledzinska, G. Jumbert, M. Placidi +4
The possibility of tailoring the critical strain of 2D materials will be crucial for the fabrication of flexible devices. In this paper, the fracture in polycrystalline MoS2 films…
Thermal conductivity of disordered porous membranes
Marianna Sledzinska, Bartlomiej Graczykowski, Francesc Alzina +4
We report measurements and Monte Carlo simulations of thermal conductivity of porous 100nm- thick silicon membranes, in which size, shape and position of the pores were varied rand…
Impact of the regularization parameter in the Mean Free Path reconstruction method: Nanoscale heat transport and beyond
M. -A. Sánchez-Martínez, F. Alzina, J. Oyarzo +2
The understanding of the mean free path (MFP) distribution of the energy carriers in materials (e.g. electrons, phonons, magnons, etc.) is a key physical insight into their transpo…
Record Low Thermal Conductivity of Polycrystalline MoS2 films: Tuning the Thermal Conductivity by Grain Orientation
M. Sledzinska, R. Quey, B. Mortazavi +8
We report a record low thermal conductivity in polycrystalline MoS2 obtained by varying grain sizes and orientations in ultrathin films. By optimizing the sulphurisation parameters…
Optomechanical coupling in the Anderson-localization regime
Pedro David García, Robert Bericat-Vadell, Guillermo Arregui +4
Optomechanical crystals, purposely designed and fabricated semiconductor nanostructures, are used to enhance the coupling between the electromagnetic field and the mechanical vibra…
Nonlinear dynamics and chaos in an optomechanical beam
D. Navarro-Urrios, N. E. Capuj, M. F. Colombano +6
Optical non-linearities, such as thermo-optic effects and free-carrier-dispersion, are often considered as undesired effects in silicon-based resonators and, more specifically, opt…
Thermal conductivity of MoS2 polycrystalline nanosheets
M. Sledzinska, B. Graczykowski, M. Placidi +8
We report a technique for transferring large areas of the CVD-grown, few-layer MoS2 from the original substrate to another arbitrary substrate and onto holey substrates, in order t…
Two-Dimensional Phononic Crystals: Disorder Matters
Markus R. Wagner, Bartlomiej Graczykowski, Juan Sebastian Reparaz +4
The design and fabrication of phononic crystals (PnCs) hold the key to control the propagation of heat and sound at the nanoscale. However, there is a lack of experimental studies…
A self-stabilized coherent phonon source driven by optical forces
Daniel Navarro-Urrios, Nestor E. Capuj, Jordi Gomis-Bresco +5
Optical forces can set tiny objects into states of coherent mechanical oscillation, also known as mechanical or phonon lasing. We present a novel pumping mechanism in an opto-mecha…
A 1D Optomechanical crystal with a complete phononic band gap
J. Gomis-Bresco, D. Navarro-Urrios, M. Oudich +9
Recent years have witnessed the boom of cavity optomechanics, which exploits the confinement and coupling of optical and mechanical waves at the nanoscale. Amongst their physical i…
A novel high resolution contactless technique for thermal field mapping and thermal conductivity determination: Two-Laser Raman Thermometry
J. S. Reparaz, E. Chavez-Angel, M. R. Wagner +4
We present a novel high resolution contactless technique for thermal conductivity determination and thermal field mapping based on creating a thermal distribution of phonons using…
Ultra-Thin Free-Standing Single Crystalline Silicon Membranes With Strain Control
Andrey Shchepetov, Mika Prunnila, Francesc Alzina +6
We report on fabrication and characterization of ultra-thin suspended single crystalline flat silicon membranes with thickness down to 6 nm. We have developed a method to control t…
Calculation of the specific heat in ultra-thin free-standing silicon membranes
E. Chávez, J. Cuffe, F. Alzina +1
The specific heat of ultra-thin free-standing membranes is calculated using the elastic continuum model. We first obtain the dispersion relations of the discrete set of acoustic mo…
Phonons in Slow Motion: Dispersion Relations in Ultra-Thin Si Membranes
John Cuffe, Emigdio Chavez, Andrey Shchepetov +11
We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as \sim 8 nm. We observe a reduction of the phase and group…
Lifetimes of Confined Acoustic Phonons in Ultra-Thin Silicon Membranes
J. Cuffe, O. Ristow, E. Chávez +8
We study the relaxation of coherent acoustic phonon modes with frequencies up to 500 GHz in ultra-thin free-standing silicon membranes. Using an ultrafast pump-probe technique of a…
Relaxation and derelaxation of pure and hydrogenated amorphous silicon during thermal annealing experiments
F. Kail, J. Farjas, P. Roura +5
The structural relaxation of pure amorphous silicon (a-Si) and hydrogenated amorphous silicon (a-Si:H) materials, that occurs during thermal annealing experiments, has been analyse…
Probing the electron-phonon coupling in ozone-doped graphene by Raman spectroscopy
F. Alzina, H. Tao, J. Moser +3
We have investigated the effects of ozone treatment on graphene by Raman scattering. Sequential ozone short-exposure cycles resulted in increasing the doping levels as inferred…
Magneto-transport in Disordered Graphene: from Weak Localization to Strong Localization
J. Moser, H. Tao, S. Roche +3
We present a magneto-transport study of graphene samples into which a mild disorder was introduced by exposure to ozone. Unlike the conductivity of pristine graphene, the conductiv…