425 citations · 1.4k across the 21 of their papers we have counts for
21 papers
Phonon-Mediated Thermal Transport in Nanocrystalline Silicon Using Machine-Learning Interatomic Potentials
Houssem Rezgui, Catalina Coll Benejam, Clivia M. Sotomayor Torres +1
Understanding phonon-mediated heat transport in structurally complex materials remains a central challenge for next-generation electronic and nanomechanical devices, where grain bo…
Dynamics of confined acoustic phonon modes in nanocrystalline silicon membranes
Tiago E. C. Magalhães, Tânia M. Ribeiro, Oili M. E. Ylivaara +2
We report femtosecond time-resolved measurements of confined acoustic phonons in free-standing nanocrystalline silicon membranes and compare them with the crystalline silicon count…
From Amorphous to Amorphous-Crystalline Mixed-Phase Boron Nitride: Evolution of the Thermal and Elastic Properties
Jiaqi Yang, Thomas Souvignet, Onurcan Kaya +11
Amorphous boron nitride (aBN) is a promising dielectric and protective coating, yet its nanoscale heat dissipation and elastic response remain poorly quantified. Here we synthesize…
Extended Multi-Temperature Model for Electron--Phonon Coupling and Ultrafast Thermal Transport in Graphene
Houssem Rezgui, Chuang Zhang, Clivia Sotomayor-Torres
Ultrafast thermal transport in low-dimensional materials challenges traditional diffusive models due to reduced scattering, strong electron-phonon coupling, and pronounced non-equi…
Heat dissipation in few-layer MoS2 and MoS2/hBN heterostructure
Alois Arrighi, Elena del Corro, Daniel Navarro Urrios +8
State-of-the-art fabrication and characterization techniques have been employed to measure the thermal conductivity of suspended, single-crystalline MoS2 and MoS2/hBN heterostructu…
Thermal transport in nanoporous holey silicon membranes investigated with optically-induced transient thermal gratings
Ryan A. Duncan, Giuseppe Romano, Marianna Sledzinska +5
In this study, we use the transient thermal grating optical technique \textemdash a non-contact, laser-based thermal metrology technique with intrinsically high accuracy \textemdas…
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…
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…
Optical and mechanical properties of nanofibrillated cellulose: towards a robust platform for next-generation green technologies
Claudia D. Simao, Juan S. Reparaz, Markus. R. Wagner +8
Nanofibrillated cellulose, a polymer that can be obtained from one of the most abundant biopolymers in Nature, is being increasingly explored due to its outstanding properties for…
Reconstructing phonon mean free path contributions to thermal conductivity using nanoscale membranes
John Cuffe, Jeffery K. Eliason, Alexei A. Maznev +8
Knowledge of the mean free path distribution of heat-carrying phonons is key to understanding phonon-mediated thermal transport. We demonstrate that thermal conductivity measuremen…
Order quantification of hexagonal periodic arrays fabricated by in situ solvent-assisted nanoimprint lithography of block copolymers
Claudia Simao, Worawut Khunsin, Nikolaos Kehagias +4
Directed self-assembly of block copolymer polystyrene-b-polyethylene oxide (PS-b-PEO) thin film was achieved by one-pot methodology of solvent vapour assisted nanoimprint lithograp…
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…
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…
Direct Measurement of Room Temperature Non-diffusive Thermal Transport Over Micron Distances in a Silicon Membrane
Jeremy A. Johnson, A. A. Maznev, John Cuffe +6
The "textbook" phonon mean free path (MFP) of heat carrying phonons in silicon at room temperature is ~40 nm. However, a large contribution to the thermal conductivity comes from l…
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…