514 citations · 890 across the 16 of their papers we have counts for
10 papers · 1 filter
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…
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…
Enhancing the response of NH3 graphene-sensors by using devices with different graphene-substrate distances
A. R. Cadore, E. Mania, A. B. Alencar +7
Graphene (G) is a two-dimensional material with exceptional sensing properties. In general, graphene gas sensors are produced in field effect transistor configuration on several su…
Observation of Diode Behavior and Gate Voltage Control of Hybrid Plasmon-Phonon Polaritons in Graphene-Hexagonal Boron Nitride Heterostructures
Francisco C. B. Maia, Brian T. O'Callahan, Alisson R. Cadore +8
Light-matter interaction in two-dimension photonic materials allows for confinement and control of free-space radiation on sub-wavelength scales. Most notably, the van der Waals he…
Anomalous Non-linear Optical Response Of Graphene Near Phonon Resonances
Lucas Lafetá, Alisson Cardore, Thiago G. Mendes Sá +5
In this work we probe the third-order non-linear optical property of graphene, hexagonal boron nitride and their heterostructure by the use of coherent anti-Stokes Raman Spectrosco…
Landau level splittings, phase transitions, and non-uniform charge distribution in trilayer graphene
Leonardo C. Campos, Thiti Taychatanapat, Maksym Serbyn +5
We report on magneto-transport studies of dual-gated, Bernal-stacked trilayer graphene (TLG) encapsulated in boron nitride crystals. We observe a quantum Hall effect staircase whic…
Thermo Activated Hysteresis on High Quality Graphene/h-BN Devices
A. R. Cadore, E. Mania, K. Watanabe +3
We report on gate hysteresis in resistance on high quality graphene/h-BN devices. We observe a thermal activated hysteretic behavior in resistance as a function of the applied gate…
Tuning the pn junction at a metal-graphene interface via H2 exposure
Alisson R. Cadore, Edrian Mania, Evandro A. Morais +4
Combining experiment and theory, we investigate how the naturally created heterojunction at a graphene and metallic contact is modulated via interaction with molecular hydrogen (H2…
ZnO UV photodetector with controllable quality factor and photosensitivity
Leonardo C. Campos, Marcos H. D. Guimaraes, Alem-Mar B. Goncalves +2
ZnO nanowires have an enormous potential for applications as ultra-violet (UV) photodetectors. Their mechanism of photocurrent generation is intimately related with the presence of…