Envelope Function Calculations for Superlattices

1986 ◽  
pp. 120-129 ◽  
Author(s):  
M. Kriechbaum
Keyword(s):  
Envelope Function

scholarly journals Self-consistent procedure including envelope function normalization for full-zone Schrödinger-Poisson problems with transmitting boundary conditions

2018 ◽  
Vol 124 (20) ◽  
pp. 204501 ◽  
Author(s):  
Devin Verreck ◽  
Anne S. Verhulst ◽  
Maarten L. Van de Put ◽  
Bart Sorée ◽  
Wim Magnus ◽  
...  
Keyword(s):  
Boundary Conditions ◽  
Envelope Function ◽  
Self Consistent ◽  
Transmitting Boundary

scholarly journals Долинно-орбитальное взаимодействие в германии, легированном донорами V группы: количественный анализ

2021 ◽  
Vol 55 (10) ◽  
pp. 901
Author(s):  
А.А. Ревин ◽  
А.М. Михайлова ◽  
А.А. Конаков ◽  
В.В. Цыпленков ◽  
В.Н. Шастин
Keyword(s):  
Short Range ◽  
Ritz Method ◽  
Orbit Interaction ◽  
Envelope Function ◽  
Triplet States ◽  
Short Range Potential ◽  
Singlet And Triplet States ◽  
Short Range Part ◽  
Range Part ◽  
Envelope Functions

In the framework of the envelope function approximation, the wave functions of electrons localized at shallow donors P, As, Sb in Ge are calculated taking into account the valley-orbit coupling caused by the donor short-range potential. It is proposed an approach that makes it possible to include inter-valley mixing in the equation for a multi-component envelope function. The calculation of the effects of the valley-orbit interaction was carried out according to the perturbation theory, while the "bare" single-valley functions were found using the Ritz method. The parameters of the short-range part of the potential and the coefficient of inter-valley mixing were found individually for each donor, making it possible to obtain the best agreement with the results of experimental measurements of the energies of the singlet and triplet states. The envelope functions of the 1s(A1) and 1s(T2) states are calculated. The parameters of the valley-orbit interaction are found for each donor. It is also shown how the functions of the excited 2s, 2p0, 2p±, 3p0 states should be modified in order to remain orthogonal to the singlet and triplet functions within the framework of a more rigorous multivalley model.

Exact envelope-function theory versus symmetrized Hamiltonian for quantum wires: a comparison

2004 ◽  
Vol 132 (3-4) ◽  
pp. 141-149 ◽  
Author(s):  
B. Lassen ◽  
L.C. Lew Yan Voon ◽  
M. Willatzen ◽  
R. Melnik
Keyword(s):  
Quantum Wires ◽  
Function Theory ◽  
Envelope Function ◽  
Theory Versus

Mean-Square Response of a Second-Order System to Nonstationary, Random Excitation

1970 ◽  
Vol 37 (3) ◽  
pp. 612-616 ◽  
Author(s):  
L. L. Bucciarelli ◽  
C. Kuo
Keyword(s):  
Narrow Band ◽  
Random Excitation ◽  
Second Order ◽  
Envelope Function ◽  
Order System ◽  
Mean Square ◽  
Forcing Function ◽  
Mean Square Response ◽  
Noise Function ◽  
The Mean

The mean-square response of a lightly damped, second-order system to a type of non-stationary random excitation is determined. The forcing function on the system is taken in the form of a product of a well-defined, slowly varying envelope function and a noise function. The latter is assumed to be white or correlated as a narrow band process. Taking advantage of the slow variation of the envelope function and the small damping of the system, relatively simple integrals are obtained which approximate the mean-square response. Upper bounds on the mean-square response are also obtained.

Envelope-function matching conditions for GaAs/(Al,Ga)As heterojunctions

1988 ◽  
Vol 38 (14) ◽  
pp. 10057-10059 ◽  
Author(s):  
Ian Galbraith ◽  
Geoffrey Duggan
Keyword(s):  
Envelope Function ◽  
Matching Conditions

scholarly journals Conserved Changes in Envelope Function during Human Immunodeficiency Virus Type 1 Coreceptor Switching

2007 ◽  
Vol 81 (15) ◽  
pp. 8165-8179 ◽  
Author(s):  
Cristina Pastore ◽  
Rebecca Nedellec ◽  
Alejandra Ramos ◽  
Oliver Hartley ◽  
John L. Miamidian ◽  
...  
Keyword(s):  
Human Immunodeficiency Virus ◽  
Human Immunodeficiency Virus Type ◽  
Virus Type ◽  
Envelope Function ◽  
Site Directed Mutagenesis ◽  
Target Cells ◽  
Immunodeficiency Virus ◽  
Coreceptor Switch ◽  
Soluble Cd4

ABSTRACT We studied the evolution of human immunodeficiency virus type 1 (HIV-1) envelope function during the process of coreceptor switching from CCR5 to CXCR4. Site-directed mutagenesis was used to introduce most of the possible intermediate mutations in the envelope for four distinct coreceptor switch mutants, each with a unique pattern of CCR5 and CXCR4 utilization that extended from highly efficient use of both coreceptors to sole use of CXCR4. Mutated envelopes with some preservation of entry function on either CCR5- or CXCR4-expressing target cells were further characterized for their sensitivity to CCR5 or CXCR4 inhibitors, soluble CD4, and the neutralizing antibodies b12-IgG and 4E10. A subset of mutated envelopes was also studied in direct CD4 or CCR5 binding assays and in envelope-mediated fusion reactions. Coreceptor switch intermediates displayed increased sensitivity to CCR5 inhibitors (except for a few envelopes with mutations in V2 or C2) that correlated with a loss in CCR5 binding. As use of CXCR4 improved, infection mediated by the mutated envelopes became more resistant to soluble CD4 inhibition and direct binding to CD4 increased. These changes were accompanied by increasing resistance to the CXCR4 inhibitor AMD3100. Sensitivity to neutralizing antibody was more variable, although infection of CXCR4-expressing targets was generally more sensitive to neutralization by both b12-IgG and 4E10 than infection of CCR5-expressing target cells. These changes in envelope function were uniform in all four series of envelope mutations and thus were independent of the final use of CCR5 and CXCR4. Decreased CCR5 and increased CD4 binding appear to be common features of coreceptor switch intermediates.

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