研究目的
Investigating the dynamics of a pure low polariton (LP) system created by resonant broadband excitation in a wide range of wave vectors in a high-Q GaAs-based microcavity.
研究成果
The LP system created by resonant broadband excitation inherits high spatial coherence from the laser pulse and maintains it during decay. The dynamics of the LP system are well described by the Gross-Pitaevskii equations, and a highly populated coherent LP state can be formed at the LP band bottom. This state persists for several picoseconds until LP-LP repulsion leads to the creation of high-energy LPs dissipating from the ground state.
研究不足
The study is limited by the specific conditions of the high-Q GaAs-based microcavity and the use of resonant broadband excitation. The dynamics observed may vary under different excitation conditions or in different types of microcavities.
1：Experimental Design and Method Selection:
The study involved the investigation of LP system dynamics using resonant broadband excitation in a high-Q GaAs-based microcavity. The dynamics were described by the Gross-Pitaevskii equations.
2：Sample Selection and Data Sources:
The sample was a 2λ GaAs/AlAs microcavity containing four sets of four 10-nm-thick In0.05Ga0.95As quantum wells.
3：05Ga95As quantum wells.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A mode-locked Ti:sapphire laser was used for resonant excitation, and a streak camera with 2-ps time resolution was employed for detecting the dynamics of the emission intensity.
4：Experimental Procedures and Operational Workflow:
LPs were excited resonantly by a mode-locked Ti:sapphire laser generating a periodic train of 2.5-ps-long pulses. The LP emission was registered in the transmission geometry from the back side of the sample.
5：5-ps-long pulses. The LP emission was registered in the transmission geometry from the back side of the sample.
Data Analysis Methods:
5. Data Analysis Methods: The time evolution of the emission intensity in real and momentum spaces was analyzed using a streak camera. The first-order long-range spatial correlation function g(1) was determined from the measurements of the interference of the light emitted from different points on the sample.
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