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Modeling Quantum Beats by Degenerate Four‐Wave Mixing Spectroscopy in a Single GaAs/AlGaAs Quantum Ring
Author(s) -
Je Koochul,
Kyhm Kwangseuk
Publication year - 2019
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201800354
Subject(s) - quantum beats , degenerate energy levels , physics , beat (acoustics) , spectroscopy , atomic physics , angular momentum , four wave mixing , oscillation (cell signaling) , picosecond , quantum , exciton , laser , condensed matter physics , quantum mechanics , chemistry , nonlinear optics , biochemistry
It has been proposed theoretically that quantum beat spectroscopy provides a direct experimental evidence of the fine states of quantized ring orbital angular momentum in a quantum ring. When a pair of picosecond pulses excites the fine exciton states coherently, oscillations can be observed in time‐integrated degenerate four‐wave mixing signals for increasing delay time. It has been found that the oscillation periods are dominated by energy separations of the fine levels near the central energy of laser spectrum due to strong coherent coupling. Magnetic dependence of the fine level separation is also investigated in terms of signal intensity and quantum beat periods.