The Diffusivity-Mobilitt Ratio Under Strong Magnetic Field in III-V Superlattices with Graded Structures

1993 ◽  
Vol 300 ◽  
Author(s):  
Kamakhya P. Ghatak ◽  
Badal De
Keyword(s):  
Magnetic Field ◽  
Experimental Method ◽  
Strong Magnetic Field ◽  
Mobility Ratio ◽  
Einstein Relation ◽  
Dispersion Law ◽  
Magnetic Quantization ◽  
Graded Structures ◽  
Theoretical Results

ABSTRACTIn this paper we have studied the Einstein relation for the diffusivity-mobility ratio in III-V superlattices with graded structures under magnetic quantization by formulating a new dispersion law. It is found, taking InAs/GaSb an example that the diffusivity mobility ratio increases in an oscillatory way with increasing carrier degeneracy as a consequence4SdH effect. The Einstein relation in IIIV superlattice is greater than that of the same for the constituent materials. Besides the theoretical results are in agreement with the suggested experimental method of determining the same ratio in degenerate materials having arbitrary dispersion laws.

The Diffusivtty-Mobility Ratio Under Strong Magnetic Field in Small Gap Superlattices with Graded Structures

1992 ◽  
Vol 262 ◽  
Author(s):  
Kamakhya P. Ghatak ◽  
Badal De
Keyword(s):  
Magnetic Field ◽  
Experimental Method ◽  
Strong Magnetic Field ◽  
Mobility Ratio ◽  
Einstein Relation ◽  
Dispersion Law ◽  
Magnetic Quantization ◽  
Graded Structures ◽  
Theoretical Results

ABSTRACTIn this paper we have studied the Einstein relation for the diffusivity-mobllity ratio (DMR) in small-gap superi at tices (SLS) with graded structures under magnetic quantization by formulating a new dispersion law. It is found, taking inAs/ GaSb SL as an example that the DMR increases in an oscillatory way with increasing carrier degeneracy due to SdH effect. The DMR in SL. is greater than that of the constituent materials. The theoretical results are in agreement with the suggested experimental method of determining the DMR in degenerate materials having arbitrary dispersion laws.

Thermoelectric Power in Quantum Confined Optoelectronic Materials under Classically Large Magnetic Field

1990 ◽  
Vol 181 ◽  
Author(s):  
Kamakhya P. Ghatak ◽  
B. De ◽  
M. Mondal ◽  
S. N. Biswas
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Quantum Wells ◽  
Thermoelectric Power ◽  
Optoelectronic Materials ◽  
Large Magnetic Field ◽  
Dispersion Law ◽  
Quantum Well Wires ◽  
Electron Dispersion ◽  
Theoretical Results

ABSTRACTWe shall study the thermoelectric power under classically large magnetic field (TPM) in optoelectronic materials of quantum wells (QWs), quantum well wires (QWW’s), quantum dots (QDs) and compare the same with the hulk specimens of optoelectronic materials by formulating the respective electron dispersion law. The TPM increases with decreasing electron concentration in an oscillatory manner in all the cases, taking n-Hg1-xC dxTe as an example. The TPM in QD is greatest and the least for quantum wells respectively. The theoretical results are in agreement with the experimental observations as reported elsewhere.

Effect of a quantizing magnetic field on the Einstein relation in bismuth

1989 ◽  
Vol 67 (1) ◽  
pp. 72-75 ◽  
Author(s):  
M. Mondal ◽  
S. N. Banik ◽  
K. P. Ghatak
Keyword(s):  
Magnetic Field ◽  
Energy Spectrum ◽  
Dispersion Relation ◽  
Einstein Relation ◽  
Energy Bands ◽  
Magnetic Quantization ◽  
Quantizing Magnetic Field ◽  
Special Case

An attempt is made to study the Einstein relation of the carriers in bismuth under magnetic quantization on the basis of the Abrikosov dispersion relation, which includes various types of anisotropics in the energy spectrum. It is found, taking spin and broadening into account, that the same ratio oscillates with the inverse quantizing magnetic field and increases with increasing carrier degeneracy respectively. In addition, the corresponding well-known result of parabolic energy bands is also obtained from the generalized expression as a special case.

Einstein Rzlation in Quantum Wires of Tetragonal Sediconduc Tors

1990 ◽  
Vol 198 ◽  
Author(s):  
Kamakhya P. Ghatak ◽  
B. De ◽  
M. Mondal ◽  
S. N. Biswas
Keyword(s):  
Energy Spectrum ◽  
Film Thickness ◽  
Electron Concentration ◽  
Energy Band ◽  
Quantum Wires ◽  
Electron Energy Spectrum ◽  
Einstein Relation ◽  
Degenerate Semiconductors ◽  
Dispersion Law ◽  
Theoretical Results

ABSTRACTWe have studied the Einstein relation for the diffusivity. mobility ratio (7PT) on the basis of a newly derived electron energy spectrum in QW f tetragonal semiconductors, within the framework of K. P method by considering all types of anisotropies of the energy band parameters. It is found, taking n-Cd3 As2 as an example that the DUTZ increases with electron concentration and decreases with film thickness in an oscillatory manner respectively. The theoretical results are in good aoreement with the suggested experimental method of determining the DMR in degenerate semiconductors having arbitrary dispersion law.

The Photoemission from Superlattices of III-V Semiconductors with Graded Interfaces Under Quantizing Magnetic Field

1994 ◽  
Vol 299 ◽  
Author(s):  
Kamakhya P. Ghatak ◽  
Badal De
Keyword(s):  
Magnetic Field ◽  
Theoretical Analysis ◽  
Electron Concentration ◽  
Quantum Limit ◽  
Super Lattice ◽  
Dispersion Law ◽  
Magnetic Quantization ◽  
Wide Gap ◽  
Quantizing Magnetic Field

AbstractIn this paper we have studied the photoemission from super-lattices of III-V semiconductors under magnetic quantization by formulating a new dispersion law. It is found, taking InAs/GaSb super-lattice with graded interfaces as an example that the photoemission, increases with increasing electron concentration in an oscillatory way and increases with decreasing magnetic field in the magnetic quantum limit. Besides, the photoemission in superlattices is much greater than that of the constituent materials and the well-known results for wide-gap materials have also been obtained from our generalized analysis. In addition, the theoretical analysis is in agreement with the experimental datas as given elsewhere.

On The Field Fmisiicn Fwom HgTe-CdTe Superlarrices with Graded Struijctures Under Magnetic Quantization

1989 ◽  
Vol 161 ◽  
Author(s):  
Kamakhya P. Ghatak ◽  
Sambjij N Biswas
Keyword(s):  
Magnetic Field ◽  
Experimental Observation ◽  
Field Emission ◽  
Electron Concentration ◽  
Current Density ◽  
Graded Structure ◽  
Magnetic Quantization ◽  
Theoretical Results

ABSTRACTIn this paper, we studied the magneto-field emission from HgTe/Cdre superlattices with graded structure and compared the same with the bulk specimens of the constituent materials. It is found that the field emitted current density increases both with electron concentration and magnetic field in an oscillatory manner. The field emission in HgTe/CdTe SLi is greater than that of the same from constituent materials the theoretical results are in agreement with the experimental observation as reported elsewhere.

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