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Your search keyword '"Mintairov, A. M."' showing total 2 results
Start Over Author "Mintairov, A. M." Topic indium phosphide Publication Year Range Last 10 years Publisher american institute of physics
2 results on '"Mintairov, A. M."'

1. Near-Field Scanning Magneto-Optical Spectroscopy of Wigner Molecules.

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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2. Excitonic lasing of strain-free InP(As) quantum dots in AlInAs microdisk.

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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