Surface optical phonons and hydrogen chemisorption on polar and nonpolar faces of GaAs, InP, and GaP

Dubois, L. H.; Schwartz, G. P.

doi:10.1103/physrevb.26.794

Cited by 152 publications

(35 citation statements)

References 14 publications

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“…35,36 The peak position of the SO modes shifts slightly to shorter frequencies for pillars with smaller diameters, although this shift is not much for the dimensions of the GaP pillars studied here. The other interesting phenomenon we observe is that the intensity of the SO phonons peak increases as the pillar diameter reduces.…”

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confidence: 88%

Surface Second-Harmonic Generation from Vertical GaP Nanopillars

2012

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We report on the experimental observation and analysis of second-harmonic generation (SHG) from vertical GaP nanopillars. Periodic arrays of GaP nanopillars with varying diameters ranging from 100 to 250 nm were fabricated on (100) undoped GaP substrate by nanosphere lithography and dry etching. We observed a strong dependence of the SHG intensity on pillar diameter. Analysis of surface and bulk contributions to SHG from the pillars including the calculations of the electric field profiles and coupling efficiencies is in very good agreement with the experimental data. Complementary measurements of surface optical phonons by Raman spectroscopy are also in agreement with the calculated field intensities at the surface. Finally, polarization of the measured light is used to distinguish between the bulk and surface SHG from GaP nanopillars.

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confidence: 88%

Surface Second-Harmonic Generation from Vertical GaP Nanopillars

2012

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“…On the other hand, when graphene is placed on a polar substrate, such as SiO 2 or hexagonal boron nitride, the surface optical phonons can interact with the electronic degrees of freedom in graphene as described above, leading to coupled plasmon-phonon modes. Hybridization of plasmon and phonon modes alters their character, dispersion and lifetime [37][38][39][40][41] . Figure 2a shows an extinction spectrum measured on a GNR superlattice with 160-nm-wide GNRs.…”

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confidence: 99%

Photocurrent in graphene harnessed by tunable intrinsic plasmons

et al. 2013

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Graphene's optical properties in the infrared and terahertz can be tailored and enhanced by patterning graphene into periodic metamaterials with sub-wavelength feature sizes. Here we demonstrate polarization-sensitive and gate-tunable photodetection in graphene nanoribbon arrays. The long-lived hybrid plasmon-phonon modes utilized are coupled excitations of electron density oscillations and substrate (SiO 2 ) surface polar phonons. Their excitation by s-polarization leads to an in-resonance photocurrent, an order of magnitude larger than the photocurrent observed for p-polarization, which excites electron-hole pairs. The plasmonic detectors exhibit photo-induced temperature increases up to four times as large as comparable two-dimensional graphene detectors. Moreover, the photocurrent sign becomes polarization sensitive in the narrowest nanoribbon arrays owing to differences in decay channels for photoexcited hybrid plasmon-phonons and electrons. Our work provides a path to light-sensitive and frequency-selective photodetectors based on graphene's plasmonic excitations.

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“…This mode has been assigned to the macroscopic Fuchs-Kliewer phonon [15,16] which should show up in the energy range between TO and LO bulk phonon modes. The Fuchs-Kliewer phonon mode [17] is a well-known macroscopic mode, its frequency is obtained by solving the wave equation with appropriate boundary conditions and c(WFK) = 1 [2,18]. The frequency of the Fuchs-Kliewer surface phonon, therefore, should be below the frequency of the bulk longitudinal optical phonon at 344.5cm-1 (42.7meV), where c(w) is zero.…”

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confidence: 99%

High-resolution Raman spectroscopy of InP(110) surface phonons

1998

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Surface phonons of InP(110) have been studied under high spectral resolution by Raman scattering, Due to the excellent energy resolution of Raman scattering in this work (maximum 1 cm-1 = 0.12meV) it was possible to resolve and identify for the first time a surface phonon mode at 350 cm -1 which appears close in energy to the bulk longitudinal optical phonon at 345 cm -1, A surface phonon has been predicted theoretically near this frequency and was assigned to a Fuchs-Kliewer phonon, This assignment is, however, not in agreement to our experimental results, which show that this surface phonon is a microscopic surface phonon mode, PACS 68,35,Ja -Surface and interface dynamics and vibrations, PACS 78,30,Fs -I II-V and II-VI semiconductors, PACS OL30,Ee -Monographs and collections,

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Surface optical phonons and hydrogen chemisorption on polar and nonpolar faces of GaAs, InP, and GaP

Cited by 152 publications

References 14 publications

Surface Second-Harmonic Generation from Vertical GaP Nanopillars

Surface Second-Harmonic Generation from Vertical GaP Nanopillars

Photocurrent in graphene harnessed by tunable intrinsic plasmons

High-resolution Raman spectroscopy of InP(110) surface phonons

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