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2 results on '"7363Hs"'

1. Nonlinear plasmonics in a two-dimensional plasma layer

Author

Bengt Eliasson and Chuan Sheng Liu

Subjects
two-dimensional plasmons, modulational instability, rogue waves, graphene, sheet of electrons, 7363Hs, Science, Physics, QC1-999
Abstract

The nonlinear electron dynamics in a two-dimensional (2D) plasma layer are investigated theoretically and numerically. In contrast to the Langmuir oscillations in a three-dimensional (3D) plasma, a well-known feature of the 2D system is the square root dependence of the frequency on the wavenumber, which leads to unique dispersive properties of 2D plasmons. It is found that for large amplitude plasmonic waves there is a nonlinear frequency upshift similar to that of periodic gravity waves (Stokes waves). The periodic wave train is subject to a modulational instability, leading to sidebands growing exponentially in time. Numerical simulations show the breakup of a 2D wave train into localized wave packets and later into wave turbulence with immersed large amplitude solitary spikes. The results are applied to systems involving massless Dirac fermions in graphene as well as to sheets of electrons on liquid helium.

Published
2016
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2. Anisotropic emission and photon-recycling in strain-balanced quantum well solar cells

Author

J. C. Rimada, James P. Connolly, D. A. Contreras-Solorio, C.I. Cabrera, Luis Hernandez, A. Enciso, Academic Unit of Physics, Universidad Autonoma de Zacatecas [Autonomous University of Zacatecas] (UAZ), Solar Cell Laboratory, University of Havana (Universidad de la Habana) (UH), Physics Faculty, Nanophotonics Technology Center, Universitat Politècnica de València (UPV), Laboratoire Génie électrique et électronique de Paris (GeePs), and Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)

Subjects
6865Fg, Photon, General Physics and Astronomy, 02 engineering and technology, 01 natural sciences, 7. Clean energy, Molecular physics, Modelling, Gallium arsenide, law.invention, chemistry.chemical_compound, 7321Fg, 7363Hs, law, 0103 physical sciences, Electro-absorption modulator, Solar cell, Spontaneous emission, ComputingMilieux_MISCELLANEOUS, Quantum well, [PHYS]Physics [physics], 010302 applied physics, Physics, 8535Be, Condensed matter physics, Condensed Matter::Other, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, Distributed Bragg reflector, 8530De, Strain in solids, 8535Be Keywords: Quantum well, chemistry, Absorption edge, 8460Jt, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 6220-x, Conversion efficiency, 0210 nano-technology
Abstract

Strain-balanced quantum well solar cells (SB-QWSCs) extend the photon absorption edge beyond that of bulk GaAs by incorporation of quantum wells in the i-region of a p i n device. Anisotropy arises from a splitting of the valence band due to compressive strain in the quantum wells, suppressing a transition which contributes to emission from the edge of the quantum wells. We have studied both the emission light polarized in the plane perpendicular (TM) to the quantum well which couples exclusively to the light hole transition and the emission polarized in the plane of the quantum wells (TE) which couples mainly to the heavy hole transition. It was found that the spontaneous emission rates TM and TE increase when the quantum wells are deeper. The addition of a distributed Bragg reflector can substantially increase the photocurrent while decreasing the radiative recombination current. We have examined the impact of the photon recycling effect on SB-QWSC performance. We have optimized SB-QWSC design to achieve single junction efficiencies above 30%., The authors wish to thank the support of CONACYT and COZCYT through project Fomix ZAC-2011-C01-172470.

Published
2014
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