研究目的
Investigating the real-time detection of single Auger recombination events in a self-assembled quantum dot and its implications for controlling the charge state in a quantum system by optical means.
研究成果
The study demonstrates the real-time detection of single Auger recombination events in a self-assembled quantum dot and the tunability of the Fano factor from Poissonian to sub-Poissonian distribution by the incident laser intensity. The Auger process can be used to control the charge state in a quantum system by optical means, independent of electron tunneling from the reservoir.
研究不足
The maximum bandwidth of 10 kHz of the optical detection scheme distorts the statistical analysis at high trion laser intensities. The study is limited to low trion laser intensities to ensure every single Auger recombination event is detected.
1：Experimental Design and Method Selection:
The study uses two-color laser excitation on the exciton and trion transition in resonance fluorescence to monitor single quantum events of the Auger process. Full counting statistics on the random telegraph signal are analyzed to access the cumulants.
2：Sample Selection and Data Sources:
A single layer of self-assembled In(Ga)As QDs embedded in a p-i-n diode is used. The QDs are coupled to a highly n-doped GaAs layer acting as a charge reservoir.
3：List of Experimental Equipment and Materials:
Confocal microscope setup within a bath cryostat at 4.2 K, tunable diode laser for excitation, avalanche photodiode (APD) for fluorescence detection, QuTau time-to-digital converter.
4：2 K, tunable diode laser for excitation, avalanche photodiode (APD) for fluorescence detection, QuTau time-to-digital converter.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The QD sample is mounted on a piezo-controlled stage under an objective lens. Resonance fluorescence is measured as a function of gate voltage and laser intensity. Time-resolved RF random telegraph signals are recorded for statistical analysis.
5：Data Analysis Methods:
Full counting statistics is performed on the telegraph signal to derive cumulants and analyze the probability distributions of Auger events.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
