scholarly journals Theory of Dynamic Conductivity of Three-Barrier Resonance-Tullel Structure with Two-Photon Laser Transitions

2015 ◽  
Vol 16 (1) ◽  
pp. 7-13
Author(s):  
Ju. O. Seti ◽  
I. V. Boyko ◽  
M. V. Pan’kiv
Keyword(s):  
Potential Wells ◽  
Dynamic Conductivity ◽  
Potential Barriers ◽  
Quantum Cascade ◽  
Two Photon ◽  
Geometric Configurations ◽  
Quantum Transitions ◽  
Electron Quantum ◽  
Different Depths ◽  
Resonant Tunneling Structure

Within the approximation of effective mass and rectangular potential barriers for the electron and using the obtained solutions of complete Schrodinger equation, the theory of dynamic conductivity for three-barrier resonant tunneling structure (InGaAs/InAlAs) with different depths of potential wells driven by weak electromagnetic field is developed in one- and two-photon approach. It is shown that varying Ga concentration one can obtain such geometric configurations of nanostructure, being an active region of quantum cascade laser, in which the increasing intensity of laser radiation, produced by electron quantum transitions accompanied by radiation of two photons with equal energy, is observed. It is established that the contribution of two-photon transitions into the complete magnitude of dynamic conductivity is not smaller than 37 %.

scholarly journals Self-Consistent Calculation of Potential Profile of GaN/AlN Resonace Tunnelling Structures

2017 ◽  
Vol 18 (3) ◽  
pp. 288-296
Author(s):  
I.V. Boyko ◽  
M.V. Tkach ◽  
Ju.O. Seti
Keyword(s):  
Electron Energy Spectrum ◽  
Potential Profile ◽  
System Of Equations ◽  
Poisson System ◽  
Potential Wells ◽  
Potential Barriers ◽  
Quantum Cascade ◽  
Self Consistent ◽  
Dielectric Continuum ◽  
Resonant Tunneling Structure

For resonant tunneling structure with GaN – potential wells and AlN – potential barriers, calculation of internal fields caused by piezoelectric and spontaneous polarization was carried. In the model the effective mass of an electron and a dielectric continuum model using finite difference method self-consistent solutions of the Schrödinger and Poisson system of equations taking into account the contribution of piezoelectric and spontaneous polarizations was found.Based on the found solutions of the Schrödinger and Poisson system of equations for resonance tunneling structure, which functioned as a cascade experimentally realized a quantum cascade detector, calculation of the potential profile and the electron energy spectrum was carried. It was found, that calculated value of detected energy is different from the experimentally obtained not more than 3 %.

scholarly journals Simultaneous two-photon calcium imaging at different depths with spatiotemporal multiplexing

2011 ◽  
Vol 8 (2) ◽  
pp. 139-142 ◽  
Author(s):  
Adrian Cheng ◽  
J Tiago Gonçalves ◽  
Peyman Golshani ◽  
Katsushi Arisaka ◽  
Carlos Portera-Cailliau
Keyword(s):  
Calcium Imaging ◽  
Two Photon ◽  
Different Depths

Dimensional Effects in Zinc Oxide Nanocomposites as Basis for Design of New Generation Gas Sensors

2021 ◽  
Vol 23 (3) ◽  
pp. 122-130
Author(s):  
E.I. Krupkin ◽  
◽  
I.A. Averin ◽  
I.A. Pronin ◽  
S.E. Igoshina ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Polyvinyl Alcohol ◽  
Gas Sensors ◽  
Current Density ◽  
Zinc Oxide Nanoparticles ◽  
Tunneling Current ◽  
Potential Wells ◽  
Potential Barriers ◽  
Dimensional Effects ◽  
New Generation

The possibility of using a nanocomposite based on zinc oxide ultrafine powder and polyvinyl alcohol as a sensitive element of a gas sensor is analyzed. It is shown that zinc oxide nanoparticles with a shape close to a rectangular parallelepiped can be considered as potential wells, separated by layers of polyvinyl alcohol that form potential barriers. The contribution of the tunneling component to nanocomposite current density is estimated for systems with and without oxygen chemisorptions. Results of numerical simulation are shown that a shift of the peaks in the dependence of transmittance on electron energy and a decrease of the tunneling current density are going with an increase in the concentration of oxygen atoms. Perspectives of the use of quantum-dimensional effects in the development of new generation gas sensors, which are based on conductivity modulation during sensor interaction with analyte gases, are demonstrated

High-accuracy calculations in the H+2 molecular ion: towards a measurement of mp/me

2007 ◽  
Vol 85 (5) ◽  
pp. 497-507 ◽  
Author(s):  
J Ph. Karr ◽  
F Bielsa ◽  
T Valenzuela ◽  
A Douillet ◽  
L Hilico ◽  
...  
Keyword(s):  
Vibrational Spectroscopy ◽  
Quantum Cascade Laser ◽  
Energy Levels ◽  
High Accuracy ◽  
Electron Mass ◽  
Mass Ratio ◽  
Molecular Ion ◽  
Quantum Cascade ◽  
Two Photon

We report on our recent advances in the calculation of the energy levels of the H+2 molecular ion, including relativistic and radiative corrections. These theoretical efforts are linked to the prospect of obtaining a new determination of the proton to electron mass ratio mp/me through precise vibrational spectroscopy of H+2. We describe the setup of our experiment, aiming at a measurement of the L = 2, υ = 0 → L = 2, υ = 1 two-photon transition at 9.166 μm using a phase-locked quantum cascade laser as excitation source.PACS Nos.: 31.15.Pf, 31.30.Jv, 32.10.Hq

Direct and Sequential Two-Photon Double Ionization of Two-Electron Quantum Dots

2018 ◽  
Vol 122 (6) ◽  
pp. 1574-1583 ◽  
Author(s):  
Henri Bachau ◽  
Lampros A. A. Nikolopoulos
Keyword(s):  
Quantum Dots ◽  
Double Ionization ◽  
Two Photon ◽  
Electron Quantum

Tristable Energy Harvesters With Asymmetric Potential Wells: Analytical Study

2017 ◽  
Author(s):  
Shengxi Zhou ◽  
Lei Zuo
Keyword(s):  
Energy Harvesting ◽  
High Energy ◽  
Harmonic Excitation ◽  
Potential Wells ◽  
Potential Barriers ◽  
Energy Harvesters ◽  
Response Characteristics ◽  
The Stability ◽  
Excitation Conditions ◽  
Main Factor

In order to reveal the nonlinear response characteristics of asymmetric tristable energy harvesters, this paper originally deduces their complete harmonic balance solutions. In addition, the Jacobian matrix for determining the stability of these analytical solutions is presented. Under different harmonic excitation conditions, the multi-solution response characteristics of asymmetric tristable energy harvesters are analyzed. In detail, asymmetric tristable energy harvesters are found to have seven solutions (four stable solutions) under the appropriate excitation condition. The influence mechanism of asymmetry of potential wells on tristable energy harvesting performance is studied. The results show that the potential barrier is a main factor to influence high-energy interwell oscillation orbit height, which determines the output voltage amplitude and the overall energy harvesting performance. The influence essence of asymmetry for tristable energy harvesters is to change their potential wells and adjust the distribution of their potential barriers.

A quantum cascade laser with coherent electron transport on two-photon transitions in a three-barrier heterostructure

2009 ◽  
Vol 35 (4) ◽  
pp. 368-370
Author(s):  
E. I. Golant ◽  
A. A. Kapralova ◽  
V. M. Lukashin ◽  
A. B. Pashkovskiĭ
Keyword(s):  
Electron Transport ◽  
Quantum Cascade Laser ◽  
Quantum Cascade ◽  
Two Photon
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