scholarly journals Three-pulse photon echo induced by the optical transition of excitons in core–shell CdSe/ZnS nanocrystal quantum dots

2011 ◽  
Vol 34 (1) ◽  
pp. 36-41 ◽  
Author(s):  
Shaohua Gong ◽  
Guotao Yang ◽  
Dongmei Ban ◽  
Jun Fu ◽  
Yunliang Fu
Keyword(s):  
Quantum Dots ◽  
Optical Transition ◽  
Photon Echo ◽  
Core Shell ◽  
Pulse Photon ◽  
Nanocrystal Quantum Dots

Three-Pulse Photon Echo Peak Shift Measurements of Capped CdSe Quantum Dots

2009 ◽  
Vol 114 (1) ◽  
pp. 82-88 ◽  
Author(s):  
Lachlan J. McKimmie ◽  
Craig N. Lincoln ◽  
Jacek Jasieniak ◽  
Trevor A. Smith
Keyword(s):  
Quantum Dots ◽  
Photon Echo ◽  
Peak Shift ◽  
Cdse Quantum Dots ◽  
Pulse Photon ◽  
Photon Echo Peak Shift

Investigation on Stimulated Photon Echo Induced by Optical Transition of 1se1sh Excitons in Core-shell CdSe/ZnS Quantum Dot-quantum Well

2012 ◽  
Vol 41 (1) ◽  
pp. 54-60
Author(s):  
龚少华 GONG Shao-hua ◽  
傅军 FU Jun ◽  
符运良 FU Yun-liang ◽  
沈振江 SHEN Zhen-jiang
Keyword(s):  
Quantum Dot ◽  
Quantum Well ◽  
Optical Transition ◽  
Photon Echo ◽  
Core Shell ◽  
Stimulated Photon Echo

Interband Optical Transition Energies in Type-II PbSe/PbS Core/Shell Quantum Dots

2017 ◽  
Vol 6 (1) ◽  
pp. 80-86
Author(s):  
S. N. Saravanamoorthy ◽  
A. John Peter
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Shell Thickness ◽  
Optical Transition ◽  
Hole Pair ◽  
Core Shell ◽  
Type Ii ◽  
Electron Hole ◽  
Transition Energies ◽  
Electron Hole Pair

Electronic and optical properties of Type-II lead based core/shell semiconducting quantum dots are reported. Binding energies of electron–hole pair, optical transition energies and the absorption coefficients are investigated taking into account the geometrical confinement in PbSe/PbS core/shell quantum dot nanostructure. The energies are obtained with the increase of shell thickness for various inner core radii. The probability densities of electron and hole wave functions of radial coordinate of the core PbSe and PbS shell quantum dots are presented. The optical transition energy with the spatial confinement is brought out. The electronic properties are obtained using variational approach whereas the compact density matrix method is employed for the nonlinear optical properties. The results show that (i) a decrease in binding energy is obtained when the shell thickness increases due to more separation of electron–hole pair and (ii) the energy band gap decreases with the increase in the shell thickness resulting in the reduction of the higher energy interband transitions.

Femtosecond three-pulse photon echo and population grating studies of the optical properties of CdTe/ZnSe quantum dots

2002 ◽  
Vol 81 (10) ◽  
pp. 1806-1808 ◽  
Author(s):  
Lap Van Dao ◽  
Martin Lowe ◽  
Peter Hannaford ◽  
Hisao Makino ◽  
Toshiaki Takai ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Photon Echo ◽  
Pulse Photon

scholarly journals Imaging and Spectroscopy of Artificial-Atom States in Core/Shell Nanocrystal Quantum Dots

2001 ◽  
Vol 86 (25) ◽  
pp. 5751-5754 ◽  
Author(s):  
Oded Millo ◽  
David Katz ◽  
YunWei Cao ◽  
Uri Banin
Keyword(s):  
Quantum Dots ◽  
Core Shell ◽  
Artificial Atom ◽  
Nanocrystal Quantum Dots ◽  
Imaging And Spectroscopy

scholarly journals Accurate photon echo timing by optical freezing of exciton dephasing and rephasing in quantum dots

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Alexander N. Kosarev ◽  
Hendrik Rose ◽  
Sergey V. Poltavtsev ◽  
Matthias Reichelt ◽  
Christian Schneider ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Complete Information ◽  
Laser Pulses ◽  
Photon Echo ◽  
Appearance Time ◽  
Emission Time ◽  
Pulse Photon ◽  
Resonant Control ◽  
Exciton Dephasing ◽  
Coherent Manipulation

AbstractSemiconductor quantum dots are excellent candidates for ultrafast coherent manipulation of qubits by laser pulses on picosecond timescales or even faster. In inhomogeneous ensembles a macroscopic optical polarization decays rapidly due to dephasing, which, however, is reversible in photon echoes carrying complete information about the coherent ensemble dynamics. Control of the echo emission time is mandatory for applications. Here, we propose a concept to reach this goal. In a two-pulse photon echo sequence, we apply an additional resonant control pulse with multiple of 2π area. Depending on its arrival time, the control slows down dephasing or rephasing of the exciton ensemble during its action. We demonstrate for self-assembled (In,Ga)As quantum dots that the photon echo emission time can be retarded or advanced by up to 5 ps relative to its nominal appearance time without control. This versatile protocol may be used to obtain significantly longer temporal shifts for suitably tailored control pulses.

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