Author: "Mintairov, A. M." / Publication Year Range: Last 10 years / Topic: indium phosphide - Searchworks@Jio Institute Digital Library Search Results

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Start Over Author "Mintairov, A. M." Topic indium phosphide Publication Year Range Last 10 years

Author: Mintairov, A. M., Kapaldo, J., Merz, J. L., Rouvimov, S., Kalyygniy, N., Mintairov, S. A., Nekrasov, S., Saly, R., Vlasov, A. S., and Blundell, S.
Subjects: *MAGNETOOPTICS, *OPTICAL spectroscopy, *WIGNER distribution, *EMISSION spectroscopy, *INDIUM phosphide, *QUANTUM dots
Abstract: We study the emission spectra of single self-organized InP/GaInP QDs (size 100-220 nm) using high-spatialresolution, low-temperature (5K) near-field scanning optical microscope (NSOM) operating at magnetic field strength B=0-10T. The dots contain up to twenty electrons and represent natural Wigner molecules (WM). We observed vibronic-type shake-up structure in single electron QDs manifesting formation of two electron (2e) WM in photo-excited state. We found that relative intensities of the shake-up components described well by vibronic Frank-Condon factors giving for dots having parabolic confinement energy hω0=1.2-4 meV molecule bond lengths 40-140 nm. We used measurements of magnetic-field-induced shifts to distinguish emission of 2e-WM and singly charged exciton (trion). We also observed magnetic-field-induced molecular-droplet transition for two electron dot, emitting through doubly charge exciton (tetron) at zero magnetic field. [ABSTRACT FROM AUTHOR]
Published: 2016
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Author: Lebedev, D. V., Kulagina, M. M., Troshkov, S. I., Vlasov, A. S., Davydov, V. Y., Smirnov, A. N., Bogdanov, A. A., Merz, J. L., Kapaldo, J., Gocalinska, A., Juska, G., Moroni, S. T., Pelucchi, E., Barettin, D., Rouvimov, S., and Mintairov, A. M.
Subjects: QUANTUM dots, QUANTUM electronics, INDIUM phosphide, TRANSMISSION electron microscopy, PHOTOLUMINESCENCE
Abstract: Formation, emission, and lasing properties of strain-free InP(As)/AlInAs quantum dots (QDs) embedded in AlInAs microdisk (MD) cavity were investigated using transmission electron microscopy and photoluminescence (PL) techniques. In MD structures, the QDs have the nano-pan-cake shape with the height of ~2 nm, the lateral size of 20-50 nm, and the density of ~5×109 cm-2. Their emission observed at ~940 nm revealed strong temperature quenching, which points to exciton decomposition. It also showed unexpected type-I character, indicating In-As intermixing as confirmed by band structure calculations. We observed lasing of InP(As) QD excitons into whispering gallery modes in MD having the diameter of ~3.2 lm and providing a free spectral range of ~27 nm and quality factors up to Q~13 000. Threshold of ~50 W/cm2 and spontaneous emission coupling coefficient of ~0.2 were measured for this MD-QD system. [ABSTRACT FROM AUTHOR]
Published: 2017
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Author: Ankudinov, A. V., Mintairov, A. M., Slipchenko, S.O., Shelaev, A.V., Yanul, M.L., Dorozhkin, P. S., and Vishnyakov, N.V.
Subjects: *NEAR-field microscopy, *LIGHT emitting diodes, *SEMICONDUCTORS, *NANOSTRUCTURES, *QUANTUM dots, *INDIUM phosphide, *GALLIUM compounds
Abstract: A technique of cantilever based scanning near-field optical microscopy is applied. Using InP/GaInP quantum dots structures, 100nm (λ/7) spatial resolution of the technique in illumination-collection regime is tested. The possibility to obtain optical data with a subdiffraction resolution is exploited for clarifying the transversal electric field mode configuration of the radiating semiconductor laser. [ABSTRACT FROM PUBLISHER]
Published: 2015
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