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• W1992545527 abstract "We investigated the evolution of photoluminescence (PL) spectra with the electron-hole $(etext{ensuremath{-}}h)$ pair density in a single T-shaped quantum wire of high quality grown by a cleaved-edge overgrowth method with molecular-beam epitaxy. By using a spectrograph imaging method for the PL measurements, we obtained PL spectra free from carrier migration effects for the one-dimensional (1D) $etext{ensuremath{-}}h$ system in the T wire for a wide range of $etext{ensuremath{-}}h$ pair densities from $5ifmmodetimeselsetexttimesfi{}{10}^{1}phantom{rule{0.3em}{0ex}}text{to}phantom{rule{0.3em}{0ex}}1.2ifmmodetimeselsetexttimesfi{}{10}^{6}phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$. In the low $etext{ensuremath{-}}h$ pair density region below $4ifmmodetimeselsetexttimesfi{}{10}^{3}phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$, PL only from 1D excitons in the wire was observed. At a pair density of $4ifmmodetimeselsetexttimesfi{}{10}^{3}phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$, a new peak characteristic of biexcitons with a binding energy of $2.8phantom{rule{0.3em}{0ex}}mathrm{meV}$ appeared below the exciton peak. At a pair density of $1ifmmodetimeselsetexttimesfi{}{10}^{5}phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$, the biexciton peak started broadening without a peak energy shift and completely changed to an $etext{ensuremath{-}}h$ plasma at $6ifmmodetimeselsetexttimesfi{}{10}^{5}phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$. The transition from the dilute exciton gas to the $etext{ensuremath{-}}h$ plasma is, therefore, a gradual crossover via biexcitons, which indicates the importance of biexcitonic effects in 1D $etext{ensuremath{-}}h$ systems. Moreover, we found that during the continuous exciton-plasma crossover, the band edge of 1D excitons showed no significant energy shift at an $etext{ensuremath{-}}h$ pair density as high as $2ifmmodetimeselsetexttimesfi{}{10}^{5}phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$, where the biexciton PL peak had already started broadening in linewidth and changing to the degenerate $etext{ensuremath{-}}h$ plasma peak. The level crossing between the band edge and the exciton was not observed experimentally." @default.
• W1992545527 created "2016-06-24" @default.
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• W1992545527 date "2006-10-27" @default.
• W1992545527 modified "2023-10-02" @default.
• W1992545527 title "Exciton-plasma crossover with electron-hole density in T-shaped quantum wires studied by the photoluminescence spectrograph method" @default.
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• W1992545527 doi "https://doi.org/10.1103/physrevb.74.165332" @default.
• W1992545527 hasPublicationYear "2006" @default.
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