Two-colour Three-pulse Spectrally Resolved Nonlinear Spectroscopy for Studies of Dynamics in Semiconductor Si Quantum Dots

We demonstrate that a two-colour three-pulsenonlinear spectroscopy can be used to study the dynamics of excited carriers inSi quantum dot structures embedded in SiN. Decays of the transverse optical phonon population and the transverse acoustic phonon population are measured and discussed. A simple theoretical modelis also used to support interpretation of our experimental observations.

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Femtosecond spectrally resolved nonlinear spectroscopy: Study of Si quantum dots

2014 Conference on Optoelectronic and Microelectronic Materials & Devices ◽

10.1109/commad.2014.7038670 ◽

2014 ◽

Author(s):

Vuong Van Cuong ◽

Nguyen Dai Hung ◽

Khuong Ba Dinh ◽

Lap Van Dao

Keyword(s):

Quantum Dots ◽

Nonlinear Spectroscopy ◽

Spectroscopy Study ◽

Spectrally Resolved ◽

Si Quantum Dots

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Enhancement of efficiency and long-term stability in graphene/Si-quantum-dot heterojunction photodetectors by employing bis(trifluoromethanesulfonyl)-amide as a dopant for graphene

Journal of Materials Chemistry C ◽

10.1039/c7tc04647b ◽

2017 ◽

Vol 5 (48) ◽

pp. 12737-12743 ◽

Cited By ~ 14

Author(s):

Dong Hee Shin ◽

Chan Wook Jang ◽

Ju Hwan Kim ◽

Jong Min Kim ◽

Ha Seung Lee ◽

...

Keyword(s):

Quantum Dots ◽

Quantum Dot ◽

Term Stability ◽

Long Term Stability ◽

Si Quantum Dot ◽

First Time ◽

Si Quantum Dots

Bis(trifluoromethanesulfonyl)-amide (TFSA) is for the first time employed as a dopant for graphene for graphene/Si-quantum-dots-based photodetectors.

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Realization of the Kohn’s Theorem in Ge/Si Quantum Dots with Hole Gas: Theory and Experiment

Nanomaterials ◽

10.3390/nano9010056 ◽

2019 ◽

Vol 9 (1) ◽

pp. 56 ◽

Cited By ~ 7

Author(s):

Hayk A. Sarkisyan ◽

David B. Hayrapetyan ◽

Lyudvig S. Petrosyan ◽

Eduard M. Kazaryan ◽

Anton N. Sofronov ◽

...

Keyword(s):

Quantum Dots ◽

Quantum Dot ◽

Molecular Beam ◽

Far Infrared ◽

Resonant Absorption ◽

Experimental Results ◽

Quantum Transitions ◽

Si Quantum Dots ◽

Specific Quantum ◽

Good Agreement

This article discusses specific quantum transitions in a few-particle hole gas, localized in a strongly oblate lens-shaped quantum dot. Based on the adiabatic method, the possibility of realizing the generalized Kohn theorem in such a system is shown. The criteria for the implementation of this theorem in a lens-shaped quantum dot, fulfilled in the experiment, is presented. An analytical expression is obtained for the frequencies of resonant absorption of far-infrared radiation by a gas of heavy holes, which depends on the geometric parameters of the quantum dot. The results of experiments on far-infrared absorption in the arrays of p-doped Ge/Si quantum dots grown by molecular beam epitaxy (MBE) with gradually increasing average number of holes in dot are presented. Experimental results show that the Coulomb interaction between the holes does not affect the resonant frequency of the transitions. A good agreement between the theoretical and experimental results is shown.

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THE INFLUENCE OF ENVIRONMENTAL EFFECTS ON THE ACOUSTIC PHONON SPECTRA IN QUANTUM-DOT HETEROSTRUCTURES

International Journal of High Speed Electronics and Systems ◽

10.1142/s0129156402001964 ◽

2002 ◽

Vol 12 (04) ◽

pp. 1147-1158 ◽

Cited By ~ 2

Author(s):

SALVADOR RUFO ◽

MITRA DUTTA ◽

MICHAEL A. STROSCIO

Keyword(s):

Quantum Dots ◽

Quantum Dot ◽

Environmental Effects ◽

Phonon Spectrum ◽

Acoustic Phonon ◽

Matrix Material ◽

Free Standing ◽

Phonon Spectra ◽

The Matrix ◽

Selection Of

We present calculations of the acoustic phonon spectra for a variety of quantum dots and consider the cases where the quantum dots are both free-standing and embedded in a selection of different matrix materials — including semiconductors, plastic, and water. These results go beyond previous calculations for free-standing quantum dots and demonstrate that the matrix material can have a large effect on the acoustic phonon spectrum and consequently on a variety of phonon-assisted transitions in quantum-dot heterostructures.

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