PHOTOFIELD EMISSION CALCULATIONS BY USING PROJECTION OPERATOR METHOD

2007 ◽  
Vol 21 (22) ◽  
pp. 1501-1507
Author(s):  
R. K. THAPA ◽  
GUNAKAR DAS ◽  
S. R. GURUNG ◽  
B. I. SHARMA ◽  
P. K. PATRA
Keyword(s):  
Wave Function ◽  
Group Theory ◽  
Matrix Element ◽  
Projection Operator ◽  
Operator Method ◽  
Emission Current Density ◽  
Initial State ◽  
Projection Operator Method ◽  
The Matrix ◽  
Dependent Vector

A model calculation of photofield emission is discussed in which initial state wave function has been deduced by using projection operator method of group theory. A spatial dependent vector potential is used to evaluate the matrix element for calculating the photofield emission current density.

A Model Photoemission Calculations Using Projection Operator Method

2003 ◽  
Vol 17 (15) ◽  
pp. 2897-2902
Author(s):  
B. Zoliana ◽  
Zaithanzauva Pachuau ◽  
Lalthakimi Zadeng ◽  
R. K. Thapa ◽  
P. K. Patra ◽  
...  
Keyword(s):  
Group Theory ◽  
Band Structure ◽  
Projection Operator ◽  
Surface States ◽  
Operator Method ◽  
Band Structure Calculations ◽  
Projection Operator Method ◽  
Structure Calculations ◽  
Bulk Band

We have shown in this report the application of projection operator method of group theory in deriving the wavefunctions for the surface state in Cu(110) which had been used in calculating photocurrent. This approach gives a qualitative characterization of surface states simply on the basis of existing bulk-band structure calculations.

Novel Technique for Quantum-Mechanical Eigenstate and Eigenvalue Calculations based on Seke's Self-Consistent Projection-Operator Method

1997 ◽  
Vol 11 (06) ◽  
pp. 245-258 ◽  
Author(s):  
J. Seke ◽  
A. V. Soldatov ◽  
N. N. Bogolubov
Keyword(s):  
Projection Operator ◽  
Equations Of Motion ◽  
Operator Method ◽  
Approximation Order ◽  
Quantum Mechanical ◽  
Approximation Technique ◽  
Operator Structure ◽  
Projection Operator Method ◽  
Self Consistent ◽  
Effective Hamiltonians

Seke's self-consistent projection-operator method has been developed for deriving non-Markovian equations of motion for probability amplitudes of a relevant set of state vectors. This method, in a Born-like approximation, leads automatically to an Hamiltonian restricted to a subspace and thus enables the construction of effective Hamiltonians. In the present paper, in order to explain the efficiency of Seke's method in particular applications, its algebraic operator structure is analyzed and a new successive approximation technique for the calculation of eigenstates and eigenvalues of an arbitrary quantum-mechanical system is developed. Unlike most perturbative techniques, in the present case each order of the approximation determines its own effective (approximating) Hamiltonian ensuring self-consistency and formal exactness of all results in the corresponding approximation order.

ERRATA: "PHOTOFIELD EMISSION CALCULATIONS BY USING PROJECTION OPERATOR METHOD"

2007 ◽  
Vol 21 (24) ◽  
pp. 1651-1652
Author(s):  
R. K. THAPA ◽  
M. P. GHIMIRE ◽  
GUNAKAR DAS ◽  
S. R. GURUNG ◽  
B. I. SHARMA ◽  
...  
Keyword(s):  
Projection Operator ◽  
Operator Method ◽  
Projection Operator Method
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