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- W2021309095 abstract "The carrier dynamics on $text{Si}(001)text{ensuremath{-}}(2ifmmodetimeselsetexttimesfi{}1)$ have been studied by means of time- and angle-resolved two-photon photoemission spectroscopies at 291 K. Temporal changes in electron populations at the normally unoccupied surface band $({D}_{text{down}})$ and at the bulk conduction-band minimum (CBM) have been probed simultaneously to characterize the pathways of bulk-to-surface electron transfer. The decay kinetics of the electron population at the bottom of ${D}_{text{down}}$ and at the CBM, obtained at two different excitation wavelengths, where the bulk absorption coefficient differs significantly, show a strong dependence on wavelength. Analysis shows that the dependence of the population at the CBM is characterized by carrier diffusion away from the surface and by rapid surface recombination, with a surface-recombination velocity of $1.2ifmmodetimeselsetexttimesfi{}{10}^{6}text{ }text{cm}/text{s}$. The surface-recombination pathway from the CBM to the high-lying state along the $overline{ensuremath{Gamma}}ensuremath{-}{overline{J}}^{ensuremath{'}}$ dispersive branch of the ${D}_{text{down}}$ band has been directly probed by an angle-resolved technique. Quantitative comparisons of electron flows into the ${D}_{text{down}}$ band and the decay kinetics of the population of the bottom of ${D}_{text{down}}$ reveal an efficient quadratic decay channel of the surface electron-hole recombination." @default.
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- W2021309095 date "2009-04-20" @default.
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- W2021309095 title "Dynamics of bulk-to-surface electron transitions on<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mtext>Si</mml:mtext><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mn>001</mml:mn></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mtext>−</mml:mtext><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mn>2</mml:mn><mml:mo>×</mml:mo><mml:mn>1</mml:mn></mml:mrow><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math>studied by time-resolved two-photon photoemission spectroscopy" @default.
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- W2021309095 doi "https://doi.org/10.1103/physrevb.79.155313" @default.
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