Effect of conduction‐band nonparabolicity on quantized energy levels of a quantum well

1986 ◽  
Vol 49 (8) ◽  
pp. 456-457 ◽  
Author(s):  
T. Hiroshima ◽  
R. Lang
Keyword(s):  
Quantum Well ◽  
Conduction Band ◽  
Energy Levels ◽  
Band Nonparabolicity

scholarly journals DETERMINATION OF THE ELECTRONIC ENERGY LEVELS OF A QUANTUM WELL HETEROSTRUTURE Zn(1-x) MgxO/ZnO/Zn1-xMgxO.

2020 ◽  
Vol 9 (12) ◽  
pp. 84-89
Keyword(s):  
Quantum Well ◽  
Conduction Band ◽  
Growth Process ◽  
Energy Levels ◽  
Electronic Energy ◽  
Magnesium Concentration ◽  
Electromagnetic Spectrum ◽  
Potential Barriers ◽  
Electronic Energy Levels

This paper studies a quantum well heterostructure made up by a zinc oxide (ZnO) thin layer (well) sandwiched between two Zn1-xMgxO layers acting as potential barriers. Setting the width of the well to a = 10 nm, the allowed quantum states in the conduction band (CB) and the wave function profiles are examined for two values of magnesium concentration : x = 0.1 and x = 0.2. The calculated wavelengths corresponding to intra-band transitions in the conduction band are in the infrared domain of the electromagnetic spectrum. These wavelengths depend on x, allowing to control the optoelectronic properties of the quantum well by adjusting the concentration x during the growth process.

Conduction-band nonparabolicity effect on refractive index and phase match in asymmetric quantum wells pumped by two infrared beams

2018 ◽  
Vol 32 (20) ◽  
pp. 1850216
Author(s):  
Xiaolong Cao ◽  
Yongli Che ◽  
Jianquan Yao
Keyword(s):  
Refractive Index ◽  
Quantum Wells ◽  
Conduction Band ◽  
Pump Beam ◽  
Energy Levels ◽  
Phase Match ◽  
Phase Mismatch ◽  
Asymmetric Quantum ◽  
Transition Matrix Elements ◽  
Band Nonparabolicity

An asymmetric quantum well (AQW) system that is pumped by two infrared beams is designed to generate terahertz (THz) waves. The refractive index and phase mismatch associated with the intersubband transition of the AQW structure are calculated and analyzed for both present and absent conduction band nonparabolicity. The calculated results reveal that, for increasing wavelengths, the refractive index of the AQW for the short-wavelength pump beam varies more than 0.83 and undergoes a 0.204 [Formula: see text]m redshift, when the conduction band nonparabolicity is considered. The variation of the refractive index of the AQW with the long-wavelength pump beam, changes from 0.225 to 0.316 after considering the conduction-band nonparabolicity. In addition, no redshift is observed. Whether the refractive index of one pump beam with its specific wavelength increases is determined mainly by the linear terms. However, for increasing the other pump wavelengths, the refractive index of one pump beam mainly depends on the nonlinear terms. Subband energy-levels and dipole transition matrix elements show noticeable changes due to conduction-band nonparabolicity, which change the refractive index. Phase matching can be achieved by adjusting the wavelength of the two pump beams. However, both phase mismatch and coverage increase when the conduction band nonparabolicity is considered.

BULK NONPARABOLIC EFFECTIVE MASS APPLIED TO CALCULATION OF LANDAU LEVEL ENERGY AND COMPARISON WITH CYCLOTRON RESONANCE IN InGaAs/InAlAs QUANTUM WELLS

2004 ◽  
Vol 18 (27n29) ◽  
pp. 3835-3838
Author(s):  
NOBUO KOTERA ◽  
KOICHI TANAKA ◽  
NOBORU MIURA
Keyword(s):  
Quantum Well ◽  
Quantum Wells ◽  
Effective Mass ◽  
Conduction Band ◽  
Electron Energy ◽  
Landau Level ◽  
Cyclotron Resonance ◽  
Energy Calculation ◽  
Level Energy ◽  
Band Nonparabolicity

Observation of band nonparabolicity is difficult because the electron energy in conduction band cannot be controlled widely. Using quantization energy in quantum well (QW) where the eigen energy is changed by QW thickness, nonparabolic effective mass inside a single QW of InGaAs was determined recently, up to 0.5 eV above bandedge. The dependence of effective mass on energy was analyzed and applied to calculate Landau level energy. Calculation fit well with cyclotron resonance experiments. Coupling between skew and normal cyclotron resonance was identified by this analysis.

Momentum matrix element and conduction band nonparabolicity in wurtzite GaN

2005 ◽  
Vol 86 (16) ◽  
pp. 161908 ◽  
Author(s):  
S. Shokhovets ◽  
G. Gobsch ◽  
O. Ambacher
Keyword(s):  
Matrix Element ◽  
Conduction Band ◽  
Momentum Matrix Element ◽  
Band Nonparabolicity
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