scholarly journals Молекулярные состояния композитных фермионов в самоорганизованных квантовых точках InP/GaInP в нулевом внешнем магнитном поле

2020 ◽  
Vol 54 (2) ◽  
pp. 138
Author(s):  
А.М. Минтаиров
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Near Field ◽  
Optical Microscope ◽  
Zero Magnetic Field ◽  
Composite Fermions ◽  
Photoluminescence Spectra ◽  
Topological Quantum ◽  
Near Field Scanning ◽  
The Magnetic Field

Abstract The size and positions of regions of line localization and the magnetic-field (0–10 T) dependence of the low-temperature (10 K) photoluminescence spectra of single InP/GaInP quantum dots with a number of electrons of N = 5–7 and a Wigner–Seitz radius of ~2.5 are determined using a near-field scanning optical microscope. The formation of composite fermion molecules with a size coinciding with that of localization regions and bond lengths of ~30 and 50 nm, respectively, at a Landau-level filling factor from 1/2 to 2/7 in zero magnetic field is established. At N = 6, the pairing and rearrangement of composite fermions under photoexcitation are found, which offers opportunities for the use of InP/GaInP quantum dots to create a magnetic-field-free topological quantum gate.

Near-Field Magneto-Photoluminescence of Singe Self-Organized Quantum Dots.

2003 ◽  
Vol 794 ◽  
Author(s):  
A. M. Mintairov ◽  
A. S. Vlasov ◽  
J. L. Merz
Keyword(s):  
Quantum Dots ◽  
Near Field ◽  
Energy Shift ◽  
Zeeman Splitting ◽  
Negative Energy ◽  
Zero Magnetic Field ◽  
Bimodal Size Distribution ◽  
Self Organized ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

ABSTRACTWe present results obtained using low temperature near-field scanning optical microscopy for the measurements of Zeeman splitting and the diamagnetic shift of single self-organized InAs/AlAs, InAs/GaAs and InP/GaInP quantum dots. The measurements allow us to relate the bimodal size distribution of InAs dots with variations in In content. For single InP QDs we observed a strong circular polarization at zero magnetic field accompanied with a negative energy shift, suggesting that strong internal magnetic fields exist in these QDs.

EXCITON–PLASMON INTERACTION IN MONOLAYERS OF METAL-SEMICONDUCTOR NANOSTRUCTURES

2011 ◽  
Vol 10 (04n05) ◽  
pp. 623-627 ◽  
Author(s):  
M. HARIDAS ◽  
L. N. TRIPATHI ◽  
J. K. BASU
Keyword(s):  
Gold Nanoparticles ◽  
Metallic Nanoparticles ◽  
Near Field ◽  
Blue Shift ◽  
Optical Microscope ◽  
Peak Position ◽  
Photoluminescence Spectra ◽  
Langmuir Blodgett ◽  
Near Field Scanning ◽  
Cdse Nanorods

Effect of shape and density on the energy transfer between metallic nanoparticles and semi conducting nanostructures was studied by observing the photoluminescence spectra using near field scanning optical microscope. The monolayers of gold nanoparticles, CdSe nanorods and composite with different number ratios were prepared using Langmuir Blodgett method. The spectra collected from the films with different number ratios of CdSe and gold shows a systematic variation of peak position and intensity as a function of number density of CdSe . The photoluminescence spectra collected from composite monolayer is blue shifted compared to the spectra from CdSe nanorods monolayer. Further we observed a blue shift in peak position and reduction emission intensity with respect to increase in the fraction of gold nanoparticles and surface density. We have provided explanation for the observed behavior in terms of strong exciton–plasmon interactions in the compact hybrid monolayers.

Near-Field Magneto-Photoluminescence of Singe Self-Organized Quantum Dots.

2003 ◽  
Vol 799 ◽  
Author(s):  
A. M. Mintairov ◽  
A. S. Vlasov ◽  
J. L. Merz
Keyword(s):  
Quantum Dots ◽  
Near Field ◽  
Energy Shift ◽  
Zeeman Splitting ◽  
Negative Energy ◽  
Zero Magnetic Field ◽  
Bimodal Size Distribution ◽  
Self Organized ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

ABSTRACTWe present results obtained using low temperature near-field scanning optical microscopy for the measurements of Zeeman splitting and the diamagnetic shift of single self-organized InAs/AlAs, InAs/GaAs and InP/GaInP quantum dots. The measurements allow us to relate the bimodal size distribution of InAs dots with variations in In content. For single InP QDs we observed a strong circular polarization at zero magnetic field accompanied with a negative energy shift, suggesting that strong internal magnetic fields exist in these QDs.

MAGNETO-OPTICS OF QUANTUM DOTS IN THE NEAR FIELD

2007 ◽  
Vol 21 (08n09) ◽  
pp. 1649-1653
Author(s):  
CONSTANTINOS SIMSERIDES ◽  
ANNA ZORA ◽  
GEORGIOS TRIBERIS
Keyword(s):  
Magnetic Field ◽  
Spatial Resolution ◽  
Near Field ◽  
Resolving Power ◽  
Zero Magnetic Field ◽  
Far Field ◽  
Field Orientation ◽  
Structural Symmetry ◽  
Near Field Optics ◽  
The Magnetic Field

We examine a quantum dot (QD) illuminated in the near field with subwavelength spatial resolution, while simultaneously it is subjected to a magnetic field of variable orientation and magnitude. The magnetic field orientation can conserve or destroy the zero-magnetic-field ("structural") symmetry. The asymmetry induced by the magnetic field -except for specific orientations along symmetry axes- can be uncovered in the near-field (NF) but not in the far-field (FF) spectra. We predict that NF magnetoabsorption experiments of realistic spatial resolution could reveal the QD symmetry. This exceptional symmetry-resolving power of the near-field optics, is lost in the far field.

scholarly journals Development of Near-field Scanning Optical Microscope Operating in Magnetic Field at Low Temperature

Shinku ◽  
2006 ◽  
Vol 49 (11) ◽  
pp. 649-652
Author(s):  
Masaru SAKAI ◽  
Yoshiaki SUGIMOTO ◽  
Kazunari MATSUDA ◽  
Toshiharu SAIKI
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Near Field ◽  
Optical Microscope ◽  
Near Field Scanning

A system of hidden quantum dots in the magnetic field: a near-field approach

2004 ◽  
Vol 16 (4) ◽  
pp. 543-552 ◽  
Author(s):  
Yu Demidenko ◽  
A Kuzyk ◽  
V Lozovski ◽  
O Tretyak
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Near Field ◽  
Field Approach ◽  
The Magnetic Field
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