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451 results on '"Bellotti, Enrico"'

164. Correlating electroluminescence characterization and physics-based models of InGaN/GaN LEDs: Pitfalls and open issues

Author

Calciati, Marco, primary, Goano, Michele, additional, Bertazzi, Francesco, additional, Vallone, Marco, additional, Zhou, Xiangyu, additional, Ghione, Giovanni, additional, Meneghini, Matteo, additional, Meneghesso, Gaudenzio, additional, Zanoni, Enrico, additional, Bellotti, Enrico, additional, Verzellesi, Giovanni, additional, Zhu, Dandan, additional, and Humphreys, Colin, additional

Published
2014
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172. Studies of spatial uniformity and jitter in SiC UV SPADs

Author

Itzler, Mark A., Bienfang, Joshua C., McIntosh, K. Alex, Sampath, Anand V., Garrett, Gregory A., Schuster, Jonathan, Smith, Jeremy L., Derenge, Michael A., Habersat, Daniel B., VanMil, Brenda, Gandhi, Reza, Dolinsky, Sergei, Heilweil, Edwin J., Bienfang, Joshua C., Bellotti, Enrico, and Wraback, Michael

Published
2023
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173. Dynamics of Photo-Excited Carriers and Coherent Effects in GaN Under Subpicosecond Laser Pulse Excitation

Author

ARMY RESEARCH LAB ADELPHI MD, Rudin, Sergey, Bellotti, Enrico, Garrett, Gregory A., Wraback, Michael, ARMY RESEARCH LAB ADELPHI MD, Rudin, Sergey, Bellotti, Enrico, Garrett, Gregory A., and Wraback, Michael

Abstract

We applied the Semiconductor Bloch Equations formalism to study the subpicosecond dynamics of photo-excited carriers in gallium nitride (GaN). The kinetics equations were derived using a two-band model and taking into account the coherent interaction of semiconductor with the short laser pulse. Various scattering terms due to interaction of carriers with polar optical phonons and carrier-carrier interaction were taken into account. Effects of the conduction band nonparabolicity and static screening were included in our theory. We find reasonable agreement with the experimental results on the time-resolved photoluminescence rise-time dependence on excitation energy and carrier density, thus confirming the dominant role of polar optical phonons in the subpicosecond dynamics, and the effects of screening., The original document contains color images.

Published
2010

184. Electroluminescence Analysis and Simulation of the Effects of Injection and Temperature on Carrier Distribution in InGaN-Based Light-Emitting Diodes with Color-Coded Quantum Wells

Author

Meneghini, Matteo, primary, Vaccari, Simone, additional, Garbujo, Alessio, additional, Trivellin, Nicola, additional, Zhu, Dandan, additional, Humphreys, Colin J., additional, Calciati, Marco, additional, Goano, Michele, additional, Bertazzi, Francesco, additional, Ghione, Giovanni, additional, Bellotti, Enrico, additional, Meneghesso, Gaudenzio, additional, and Zanoni, Enrico, additional

Published
2013
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187. Tunable chirality and circular dichroism of a topological insulator with C2υ symmetry as a function of Rashba and Dresselhaus parameters.

Author

Sengupta, Parijat and Bellotti, Enrico

Subjects
*CHIRALITY, *POLARIZATION (Electricity), *BAND gaps, *CIRCULAR dichroism, *STEREOCHEMISTRY
Abstract

Polarization-sensitive devices rely on meta-materials to exhibit varying degrees of absorption of light of a given handedness. The chiral surface states of a topological insulator selectively absorb right- and left-circularly polarized light in the vicinity of the Dirac cone reaching its maximum of unity at the Γ point. In this letter, we show that a band gap open topological insulator with C2υ symmetry, which is represented through a combination of Rashba and Dresselhaus Hamiltonians, alters the preferential absorption of left- and right-circularly polarized light allowing a smooth variation of the circular dichroism. This variation in circular dichroism, in a range of positive and negative values, is shown to be a function of the Rashba and Dresselhaus coupling parameters. [ABSTRACT FROM AUTHOR]

Published
2016
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