scholarly journals Performance comparison of hybrid functionals for describing narrow-gap semiconductors: A study on low-temperature thermoelectric material α-SrSi2

2022 ◽  
Vol 30 ◽  
pp. e00620
Author(s):  
Daishi Shiojiri ◽  
Tsutomu Iida ◽  
Masato Yamaguchi ◽  
Naomi Hirayama ◽  
Yoji Imai
Keyword(s):  
Low Temperature ◽  
Thermoelectric Material ◽  
Performance Comparison ◽  
Narrow Gap ◽  
Narrow Gap Semiconductors ◽  
Hybrid Functionals

Narrow Gap Semiconductors as Low Temperature Pressure Gauges

1978 ◽  
pp. 523-528 ◽  
Author(s):  
M. Kończykowski ◽  
M. Baj ◽  
E. Szafarkiewicz ◽  
L. Kończewicz ◽  
S. Porowski
Keyword(s):  
Low Temperature ◽  
Narrow Gap ◽  
Narrow Gap Semiconductors

MATHEMATICAL MODELING OF TEMPERATURE EFFECT ON THE FAN CHART OF MAGNETOABSORPTION SPECTRUM IN SEMICONDUCTORS

2019 ◽  
pp. 104-115
Author(s):  
G. Gulyamov ◽  
U. I. Erkaboev ◽  
A. G. Gulyamov
Keyword(s):  
Mathematical Modeling ◽  
Magnetic Field ◽  
Temperature Dependence ◽  
Density Of States ◽  
Landau Levels ◽  
Joint Density ◽  
Narrow Gap ◽  
Narrow Gap Semiconductors ◽  
Dispersion Law ◽  
The Magnetic Field

The article considers the oscillations of interband magneto-optical absorption in semiconductors with the Kane dispersion law. We have compared the changes in oscillations of the joint density of states with respect to the photon energy for different Landau levels in parabolic and non-parabolic zones. An analytical expression is obtained for the oscillation of the combined density of states in narrow-gap semiconductors. We have calculated the dependence of the maximum photon energy on the magnetic field at different temperatures. A theoretical study of the band structure showed that the magnetoabsorption oscillations decrease with an increase in temperature, and the photon energies nonlinearly depend on a strong magnetic field. The article proposes a simple method for calculating the oscillation of joint density of states in a quantizing magnetic field with the non-quadratic dispersion law. The temperature dependence of the oscillations joint density of states in semiconductors with non-parabolic dispersion law is obtained. Moreover, the article studies the temperature dependence of the band gap in a strong magnetic field with the non-quadratic dispersion law. The method is applied to the research of the magnetic absorption in narrow-gap semiconductors with nonparabolic dispersion law. It is shown that as the temperature increases, Landau levels are washed away due to thermal broadening and density of states turns into a density of states without a magnetic field. Using the mathematical model, the temperature dependence of the density distribution of energy states in strong magnetic fields is considered. It is shown that the continuous spectrum of the density of states, measured at the temperature of liquid nitrogen, at low temperatures turns into discrete Landau levels. Mathematical modeling of processes using experimental values of the continuous spectrum of the density of states makes it possible to calculate discrete Landau levels. We have created the three-dimensional fan chart of magneto optical oscillations of semiconductors with considering for the joint density of energy states. For a nonquadratic dispersion law, the maximum frequency of the absorbed light and the width of the forbidden band are shown to depend nonlinearly on the magnetic field. Modeling the temperature  dependence allowed us to determine the Landau levels in semiconductors in a wide temperature spectrum. Using the proposed model, the experimental results obtained for narrow-gap semiconductors are analyzed. The theoretical results are compared with experimental results.

Why various types of donor can either enhance or reduce electron mobility in narrow-gap semiconductors

1993 ◽  
Vol 8 (1S) ◽  
pp. S40-S43 ◽  
Author(s):  
C Skierbiszewski ◽  
Z Wilamowski ◽  
T Suski ◽  
J Kossut ◽  
B Witkowska
Keyword(s):  
Electron Mobility ◽  
Narrow Gap ◽  
Narrow Gap Semiconductors

scholarly journals OPTICAL CONDUCTIVITY OF ONE-DIMENSIONAL NARROW-GAP SEMICONDUCTORS

2002 ◽  
Vol 16 (10) ◽  
pp. 1499-1509
Author(s):  
HYUN C. LEE
Keyword(s):  
Carbon Nanotubes ◽  
Optical Conductivity ◽  
Group Analysis ◽  
Thermal Fluctuations ◽  
Energy Scale ◽  
Narrow Gap ◽  
Crossover Temperature ◽  
Renormalization Group Analysis ◽  
One Dimensional ◽  
Narrow Gap Semiconductors

The optical conductivities of two one-dimensional narrow-gap semiconductors, anticrossing quantum Hall edge states and carbon nanotubes, are studied using bosonization method. A lowest order renormalization group analysis indicates that the bare band gap can be treated perturbatively at high frequency/temperature. At very low energy scale the optical conductivity is dominated by the excitonic contribution, while at temperature higher than a crossover temperature the excitonic features are eliminated by thermal fluctuations. In case of carbon nanotubes the crossover temperature scale is estimated to be 300 K.

Radiative recombination of hot carriers in narrow-gap semiconductors

2012 ◽  
Vol 46 (1) ◽  
pp. 29-34
Author(s):  
N. V. Pavlov ◽  
G. G. Zegrya
Keyword(s):  
Radiative Recombination ◽  
Narrow Gap ◽  
Hot Carriers ◽  
Narrow Gap Semiconductors

Calculation of chemisorption energies of oxygen on narrow-gap semiconductors

1974 ◽  
Vol 15 (5) ◽  
pp. 863-866 ◽  
Author(s):  
S.G. Davison ◽  
Y.S. Huang
Keyword(s):  
Narrow Gap ◽  
Narrow Gap Semiconductors
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