Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-02-20
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, including 3 figures; revised with new data
Scientific paper
A recent single quantum wire is of sufficient quality to reveal new details of the photoluminescence (PL) evolution with increasing electron--hole (e--h) pair density. At a pair density of 3.6 $\times$ 10$^{3}$ cm$^{-1}$, the PL is characteristic of biexcitons shifted below the exciton peak by the 2.8-meV biexciton binding. At the pair density of 1.2 $\times$ 10$^{5}$ cm$^{-1}$, the biexciton peak broadens without energy shift to an e--h plasma. At all pair densities up to 30 K, neither the exciton peak nor the one-dimensional (1D) continuum edge shows any shift. In contrast to prevailing theories, the low-energy edge of the plasma PL line never crosses the exciton peak and never makes contact with the 1D e--h continuum.
Akiyama Hidefumi
Asano Kenichi
Hayamizu Yuhei
Ogawa Tetsuo
Pfeiffer Loren N.
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