29 citations · 151 across the 9 of their papers we have counts for
9 papers
Observation of well-defined Kohn-anomaly in high-quality graphene devices at room temperature
Andreij C. Gadelha, Rafael Nadas, Tiago C. Barbosa +5
Due to its ultra-thin nature, the study of graphene quantum optoelectronics, like gate-dependent graphene Raman properties, is obscured by interactions with substrates and surround…
Raman spectra of twisted bilayer graphene close to the magic angle
Tiago C. Barbosa, Andreij C. Gadelha, Douglas A. A. Ohlberg +5
In this work, we study the Raman spectra of twisted bilayer graphene samples as a function of their twist-angles (), ranging from 0.03 to 3.40, where local a…
Electron-phonon coupling in a magic-angle twisted-bilayer graphene device
Andreij C. Gadelha, Viet-Hung Nguyen, Eliel G. Neto +6
The importance of phonons in the strong correlation phenomena observed in twisted bilayer graphene (TBG) at the so-called magic-angle is under debate. Here we apply gate-dependent…
The limits of Near Field Immersion Microwave Microscopy evaluated by imaging bilayer graphene Moiré patterns
Douglas A. A. Ohlberg, Diego Tami, Andreij C. Gadelha +11
Molecular and atomic imaging required the development of electron and scanning probe microscopies to surpass the physical limits dictated by diffraction. Nano-infrared experiments…
Gate-tunable non-volatile photomemory effect in MoS transistors
Andreij C. Gadelha, Alisson R. Cadore, Kenji Watanabe +5
Non-volatile memory devices have been limited to flash architectures that are complex devices. Here, we present a unique photomemory effect in MoS transistors. The photomemory…
Local photodoping in monolayer MoS2
Andreij C. Gadelha, Alisson R. Cadore, Lucas Lafeta +4
Inducing electrostatic doping in 2D materials by laser exposure (photodoping effect) is an exciting route to tune optoelectronic phenomena. However, there is a lack of investigatio…
Lattice dynamics localization in low-angle twisted bilayer graphene
Andreij C. Gadelha, Douglas A. A. Ohlberg, Cassiano Rabelo +20
A low twist angle between the two stacked crystal networks in bilayer graphene enables self-organized lattice reconstruction with the formation of a periodic domain. This superlatt…
Probing the Electronic Properties of Monolayer MoS via Interaction with Molecular Hydrogen
Natália P. Rezende, Alisson R. Cadore, Andreij C. Gadelha +8
This work presents a detailed experimental investigation of the interaction between molecular hydrogen (H) and monolayer MoS field effect transistors (MoS FET), aiming…
Reversible doping of graphene field effect transistors by molecular hydrogen: the role of the metal/graphene interface
C. L. Pereira, A. R. Cadore, N. P. Rezende +5
In this work, we present an investigation regarding how and why molecular hydrogen changes the electronic properties of graphene field effect transistors. We demonstrate that inter…