Influence of exciton-exciton interactions on frequency-mixing signals in a stable exciton-biexciton system
Influence of exciton-exciton interactions on frequency-mixing signals in a stable exciton-biexciton system
复制标题
激子-激子相互作用对稳定激子-双激子系统中混频信号的影响
DOI：
10.1103/physrevb.63.073303
复制
发表时间：
2001
影响因子：
3.7
通讯作者：
T. Kondo
中科院分区：
文献类型：
--
作者：
J. Ishi;H. Kunugita;K. Ema;T. Ban;T. Kondo
在稳定的激子-双激子系统中进行了飞秒域瞬态非简并四波混频。对于频率为${\ensuremath{\omega}}_{1}$和${\ensuremath{\omega}}_{2}$的两个频谱窄脉冲的激励，彼此之间没有频谱重叠，只观察到$2{\ensuremath{\omega}}_{1}\ensuremath{\omega}} -}{\ensuremath{\omega}}_{2}$的混频信号。混频信号强度的偏振依赖性随着入射脉冲频率差的增大而发生显著变化。结果表明，混频信号与激子动力学密切相关，激子-激子相互作用引起了混频信号偏振依赖性的剧烈变化。
Transient nondegenerate four-wave mixing was performed in the femtosecond domain on a stable exciton-biexciton system. For excitation with two spectrally narrow pulses of frequencies ${\ensuremath{\omega}}_{1}$ and ${\ensuremath{\omega}}_{2}$ that have no spectral overlap with each other, only a frequency-mixing signal at $2{\ensuremath{\omega}}_{1}\ensuremath{-}{\ensuremath{\omega}}_{2}$ was observed. The polarization dependence of the frequency-mixing signal intensity changed dramatically with increasing frequency difference between the incident pulses. Our results demonstrate that the frequency-mixing signal is strongly correlated with the exciton dynamics and the dramatic change of its polarization dependence is caused by the exciton-exciton interactions.