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Decoupling thermoelectric coefficients of multilayer graphene by nanomeshing
Mehrdad Rahimi, Nunzia Lubertino, Roberto Bellelli +8
Nanostructuring materials at small scales enables control over their physical properties, revealing behaviors not observed at larger dimensions. This strategy is particularly effec…
High Strain Engineering of a Suspended WSSe Monolayer Membrane by Indentation and Measured by Tip-enhanced Photoluminescence
Anis Chiout, Agnès Tempez, Thomas Carlier +9
Straintronics involves the manipulation and regulation of the electronic characteristics of 2D materials through the use of macro- and nano-scale strain engineering. In this study,…
Quasi van der Waals Epitaxy of Rhombohedral-stacked Bilayer WSe2 on GaP(111) Heterostructure
Aymen Mahmoudi, Meryem Bouaziz, Niels Chapuis +11
The growth of bilayers of two-dimensional (2D) materials on conventional 3D semiconductors results in 2D/3D hybrid heterostructures, which can provide additional advantages over mo…
Electroluminescence of monolayer WS in a scanning tunneling microscope: the effect of bias polarity on the spectral and angular distribution of the emitted light
Ricardo Javier Peña Román}, Delphine Pommier, Rémi Bretel +12
Inelastic electron tunneling in a scanning tunneling microscope (STM) is used to generate excitons in monolayer tungsten disulfide (WS). Excitonic electroluminescence is measur…
Indirect to direct band gap crossover in two-dimensional WS2(1-x)Se2x alloys
Cyrine Ernandes, Lama Khalil, Hela Almabrouk +12
In atomically thin transition metal dichalcogenide semiconductors, there is a crossover from indirect to direct bandgap as the thickness drops to one monolayer, which comes with a…
Phase Transition in a Memristive Suspended MoS2 Monolayer Probed by Opto- and Electro-Mechanics
Julien Chaste, Imen Hnid, Lama Khalil +8
Semiconducting monolayer of 2D material are able to concatenate multiple interesting properties into a single component. Here, by combining opto-mechanical and electronic measureme…
Nanomechanical strain concentration on a 2D nanobridge within a large suspended bilayer graphene for molecular mass detection
Julien Chaste, Amine Missaoui, Amina Saadani +4
The recent emergence of strain gradient engineering directly affects the nanomechanics, optoelectronics and thermal transport fields in 2D materials. More specifically, large suspe…
Evidence of Direct Electronic Band Gap in two-dimensional van der Waals Indium Selenide crystals
Hugo Henck, Debora Pierucci, Jihene Zribi +12
Metal mono-chalcogenide compounds offer a large variety of electronic properties depending on chemical composition, number of layers and stacking-order. Among them, the InSe has at…
Intrinsic properties of suspended MoS2 on SiO2/Si pillar arrays for nanomechanics and optics
Julien Chaste, Amine Missaoui, Si Huang +8
Semiconducting 2D materials, such as transition metal dichalcogenides (TMDs), are emerging in nanomechanics, optoelectronics, and thermal transport. In each of these fields, perfec…
Nanostructures in suspended mono- and bilayer epitaxial graphene
Julien Chaste, Amina Saadani, Alexandre Jaffre +5
Suspended graphene membrane presents a particular structure with fundamental interests and applications in nanomechanics, thermal transport and optoelectronics. Till now, the commo…
Atomic monolayer deposition on the surface of nanotube mechanical resonators
Alexandros Tavernarakis, Julien Chaste, Alexander Eichler +4
We studied monolayers of noble gas atoms (Xe, Kr, Ar, and Ne) deposited on individual ultra- clean suspended nanotubes. For this, we recorded the resonance frequency of the mechani…
High-frequency nanotube mechanical resonators
J. Chaste, M. Sledzinska, M. Zdrojek +2
We report on a simple method to fabricate high-frequency nanotube mechanical resonators reproducibly. We measure resonance frequencies as high as 4.2 GHz for the fundamental eigenm…
A Mechanical Mass Sensor with Yoctogram Resolution
J. Chaste, A. Eichler, J. Moser +3
Nanoelectromechanical systems (NEMS) have generated considerable interest as inertial mass sensors. NEMS resonators have been used to weigh cells, biomolecules, and gas molecules,…
Parametric amplification and self-oscillation in a nanotube mechanical resonator
Alexander Eichler, Julien Chaste, Joel Moser +1
A hallmark of mechanical resonators made from a single nanotube is that the resonance frequency can be widely tuned. Here, we take advantage of this property to realize parametric…
Nonlinear damping in mechanical resonators based on graphene and carbon nanotubes
A. Eichler, J. Moser, J. Chaste +3
Carbon nanotubes and graphene allow fabricating outstanding nanomechanical resonators. They hold promise for various scientific and technological applications, including sensing of…
Transport scattering time probed through rf admittance of a graphene capacitor
E. Pallecchi, A. C. Betz, J. Chaste +5
We have investigated electron dynamics in top gated graphene by measuring the gate admittance of a diffusive graphene capacitor in a broad frequency range as a function of carrier…
Single Carbon Nanotube Transistor at GHz Frequency
Julien Chaste, Lorenz Lechner, Pascal Morfin +7
We report on microwave operation of top-gated single carbon nanotube transistors. From transmission measurements in the 0.1-1.6 GHz range, we deduce device transconductance gm and…