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Superfluorescence from Magnetically Formed Quantum Dots: the Excitation Pulse-Width Dependence
조영달,이진호,Gary D. Sanders,Christopher J. Stanton,David H. Reitze,Junichiro Kono,Alexey A. Belyanin 한국광학회 2008 Current Optics and Photonics Vol.12 No.1
We investigated the laser pulse-width dependence of dense plasmas confined within the magnetic length of In0.2Ga0.8As/GaAs multiple quantum wells under high magnetic fields up to 31 T. To fully fill the Landau levels of effectively zero-dimensional system, we used intense femtosecond (fs) laser pulses to create carrier densities near 1013/cm2. The observed photoluminescence showed a characteristic of superfluorescence, above critical magnetic field when being excited by pulses shorter than coherence buildup time.
Terahertz Emission from Nanophononic Heterostructures: the Nexus Between Scale and Origin
Hoonill Jeong,Jihoon Jeong,조영달,Eunsoon Oh,Dai-Sik Kim,Christopher J. Stanton 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.1
Newly found mechanisms of terahertz (THz) radiation via acoustic standing waves and piezoelectric fields in GaN-based strained heterostructures are discussed in terms of the relevant layer thickness. Two sample structures, with quantum well widths smaller (S1) or larger (S2) than the quasi-two-dimensional exciton Bohr radius, were investigated with increasing excitation energy. For comparative purposes, the differential reflectivity spectra (DRS) were also measured, and the signal strengths were proportional to the phase-space filling effect of quantum well carriers. The signal trace versus excitation energy in THz radiation compared to the DRS reveals that the radiation is closely related with the AlGaN/GaN interface (S1) and quantum wells (S2).