Dynamics of Strongly Degenerate Electron−Hole Plasmas and Excitons in Single InP Nanowires
作者： Lyubov V Titova , Thang Ba Hoang , Jan M Yarrison-Rice , Howard E Jackson , Yong Kim
DOI: 10.1021/NL071733L
关键词: Nanowire 、 Photoluminescence 、 Surface states 、 Electron density 、 Atomic physics 、 Exciton 、 Spectroscopy 、 Materials science 、 Band gap 、 Electron hole 、 Mechanical engineering 、 General Materials Science 、 Bioengineering 、 General chemistry 、 Condensed matter physics
摘要: Low-temperature time-resolved photoluminescence spectroscopy is used to probe the dynamics of photoexcited carriers in single InP nanowires. At early times after pulsed excitation, line shape displays a characteristic broadening, consistent with emission from degenerate, high-density electron-hole plasma. As plasma cools and carrier density decreases, rapidly converges toward relatively narrow band free exciton nanowire. The excitons these nanowires exhibit recombination lifetimes closely approaching that measured high-quality epilayer, suggesting nanowires, electrons holes are insensitive surface states. This results higher quantum efficiencies than other single-nanowire systems as well significant state-filling gap renormalization, which observed at high densities.
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