講演情報
[7p-N204-8]Collective Emission Through Electron-Hole Plasma
〇(D)Naresh Aggarwal1, Dmitry Dirin2, Maksym Kovalenko2,3, K. V. Adarsh1 (1.IISER Bhopal, 2.ETH Zurich, 3.Empa Dubendorf)
キーワード：
Collective emission、Electron-hole plasma、Perovskites nanocrystals
Electron-hole plasma (EHP), a high-density correlated state, which has recently observed in various materials such as group II-VI semiconductors, transition metal dichalcogenides (TMDCs) and halide perovskites. While promising for high-temperature photonic devices, collective emission phenomena like amplified spontaneous emission (ASE) and superfluorescence (SF) from EHP in perovskite nanocrystals remain largely unexplored without external stimuli. Here, we show that EHP in CsPbBr3 nanocrystals induces broadband optical gain. Temperature and fluence dependent femtoseconds photoluminescence and transient absorption, we identify two distinct ASE bands at 5 K-excitonic (25 μJ/cm2) and EHP (100 μJ/cm2). Our TA study presents that the EHP state produces a remarkable optical gain of ~ 150 meV. This EHP-induced ASE behaviour persisted up to 125 K. At 300 K, EHP induced ASE vanishes due to thermal and non-radiative losses, and the excitonic ASE threshold increases by over an order of magnitude. Our work provides a application of many-body correlated states in optoelectronic devices and many other macroscopic quantum phenomena.