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• W2022167329 startingPage "4718" @default.
• W2022167329 abstract "We report an investigation of the fundamental absorption edge of InSe under high-resolution conditions. We resolve three components of the direct exciton series and obtain an effective Rydberg energy of 14.5 meV. From this value an effective mass ($m=0.10 {m}_{0}$) of electrons in the $ensuremath{Gamma}$ minimum of the conduction band is obtained. We analyze the absorption coefficient with a three-dimensional model and find a remarkable agreement. We deduce an interband matrix element in polarization $stackrel{ensuremath{rightarrow}}{mathrm{E}}ensuremath{perp}stackrel{ensuremath{rightarrow}}{mathrm{C}}:{P}_{ensuremath{perp}}^{2}=0.6$ eV. Next we investigate the temperature dependence of the fundamental absorption edge. We find a strong interaction with a 14-meV phonon which accounts for (i) the shift of the band-gap energy in the full temperature range between liquid-helium temperature and 300ifmmode^circelsetextdegreefi{}K and (ii) the temperature dependence of the broadening parameter (exciton lifetime). A simple analytical expression is obtained which accounts for the temperature dependence of the band gap and the $n=1$ exciton structure. Last, we deduce the electron-phonon coupling constant." @default.
• W2022167329 created "2016-06-24" @default.
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• W2022167329 date "1978-06-15" @default.
• W2022167329 modified "2023-10-10" @default.
• W2022167329 title "Excitonic absorption edge of indium selenide" @default.
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• W2022167329 doi "https://doi.org/10.1103/physrevb.17.4718" @default.
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