Ultrafast dynamics of photoinjected electrons at the nonthermal regime in the intra-T-valley relaxation in InP studied by time- and angle-resolved photoemission spectroscopy
PHYSICAL REVIEW B(2022)
摘要
We study ultrafast relaxation of photoinjected electrons confined within the I' valley of InP, based on the transient electron distribution functions determined using time-and angle-resolved photoemission spectroscopy. To elucidate fundamental processes that lead to the quasithermalization of electron subsystem at the nonthermal regime of relaxation, the dynamics are investigated in two p-type samples with different doping levels, which exhibit different energy-relaxation rates of energetic electrons. In both samples, the photoinjected nonthermal-electron distributions are quasithermalized only at a finite time delay of several hundreds of femtoseconds. Although the magnitude of the time delay for quasithermalization depends on the initially prepared nascent elec-tron distribution and on the energy-relaxation rates in different samples, the quasithermalization is established at the specific electron distribution of ensembles; electrons with a density of similar to 1 x 1017 cm-3 are condensed in the phase space characterized by the maximum energy of 0.27 eV and by the maximum wave vector of 0.09 angstrom-1. The essential features of quasithermalization observed in InP are the same as those recently reported for GaAs [Phys. Rev. B 104, 245201 (2021)], showing that the delayed quasithermalization is general for electrons photoinjected by ultrashort-laser excitation in the I' valley of direct-gap semiconductors.
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