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Free‐carrier generation by two‐photon resonant excitation to the excitonic states in cuprous oxide
Author(s) -
Naka Nobuko,
Akimoto Ikuko,
Shirai Masanobu
Publication year - 2013
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201200713
Subject(s) - exciton , excitation , atomic physics , auger effect , resonance (particle physics) , laser linewidth , cyclotron resonance , phonon , photon energy , nanosecond , photon , biexciton , spectroscopy , physics , chemistry , auger , laser , condensed matter physics , plasma , cyclotron , optics , quantum mechanics
We have investigated nanosecond temporal responses of the cyclotron resonance signal of optically generated carriers in Cu 2 O. The rise time is found to increase significantly as the excitation photon energy approaches to the phonon‐assisted absorption edge of the 1s exciton. We model the generation of free carriers by two‐body collisions of excitons, which leads to the reasonable estimation of the Auger coefficient. We also demonstrate the excitation spectroscopy of cyclotron resonance by using a two‐photon transition to the even‐parity excitonic states. Their dynamics is discussed based on the quantum‐number dependence of the resonance linewidth.