Spin-Polarization in Ultrathin Rh Layers on Fe (001)

1993 ◽  
Vol 313 ◽  
Author(s):  
A. Chouairi ◽  
H. Dreysse ◽  
H. Nait-Laziz ◽  
C. Demangeat
Keyword(s):  
Spin Polarization ◽  
Photoelectron Spectroscopy ◽  
Tight Binding ◽  
Mean Field ◽  
Lattice Parameter ◽  
Tight Binding Model ◽  
Binding Model ◽  
Fee Structure ◽  
Self Consistent ◽  
Good Agreement

ABSTRACTThe origin of the Rh polarization at the interface with Fe is discussed within a self-consistent mean-field parameterized tight-binding model. Since experimentally it is not yet known how Rh grows on Fe (001), in this paper we consider both fee and bec growth. When Rh grows in the fee structure, it expands its lattice parameter and a polarization is present up to 3 layers, whereas in the bec case only the Rh atoms at the interface are polarized. The results obtained are compared to recent spin- and angle-resolved photoelectron spectroscopy experiments. Good agreement with experiment is obtained in the case of a fee Rh configuration.

Self-consistent tight binding model adapted for hydrocarbon systems

2005 ◽  
Vol 31 (8) ◽  
pp. 585-595 ◽  
Author(s):  
D. A. Areshkin ◽  
O. A. Shenderova ◽  
J. D. Schall ◽  
D. W. Brenner
Keyword(s):  
Tight Binding ◽  
Tight Binding Model ◽  
Binding Model ◽  
Self Consistent

Mean field theory study of a tight-binding model for the high Tc oxides

1988 ◽  
Vol 67 (4) ◽  
pp. 349-353 ◽  
Author(s):  
X.Y. Chen ◽  
W.P. Su ◽  
C.S. Ting ◽  
D.Y. Xing
Keyword(s):  
Field Theory ◽  
Mean Field Theory ◽  
Tight Binding ◽  
Mean Field ◽  
Tight Binding Model ◽  
Binding Model ◽  
High Tc

scholarly journals Influence of Internal Electric Fields on the Ground Level Emission of GaN/AlGaN Multi-Quantum Wells

2000 ◽  
Vol 5 (S1) ◽  
pp. 970-976
Author(s):  
A. Bonfiglio ◽  
M. Lomascolo ◽  
G. Traetta ◽  
R. Cingolani ◽  
A. Di Carlo ◽  
...  
Keyword(s):  
Experimental Data ◽  
Quantum Wells ◽  
Electric Fields ◽  
Tight Binding ◽  
Ground Level ◽  
Analytic Model ◽  
Tight Binding Model ◽  
Binding Model ◽  
Emission Energy ◽  
Self Consistent

The spectroscopic investigation of GaN/AlGaN quantum wells reveals that the emission energy of such structures is determined by four parameters, namely composition, well-width, strain and charge density. The experimental data obtained by varying these parameters are quantitatively explained by an analytic model based on the envelope function formalism which accounts for screening and built-in field, and by a full self-consistent tight-binding model.

Composition and Strain Dependence of the Piezoelectric Coefficients in Semiconductor Alloys

2007 ◽  
Vol 1017 ◽  
Author(s):  
T. Hammerschmidt ◽  
M. A. Migliorato ◽  
D. Powell ◽  
A. G. Cullis ◽  
G. P. Srivastava
Keyword(s):  
First Principles ◽  
Density Functional ◽  
Piezoelectric Coefficient ◽  
Tight Binding ◽  
Tight Binding Model ◽  
Semiconductor Alloys ◽  
Binding Model ◽  
Functional Theory ◽  
Photo Current ◽  
Good Agreement

AbstractWe propose a tight-binding model for the polarization that considers direct and dipole contributions and employs microscopic quantities that can be calculated by first-principles methods, e.g. by employing Density Functional Theory (DFT). Applying our model to InxGa1-xAs alloys allows us to settle discrepancies between the values of e14 as obtained from experiments and from linear interpolations between the values of InAs and GaAs. Our calculated piezoelectric coefficient is in very good agreement with photo current measurements of InAs/GaAs(111) quantum well samples.

Influence of Internal Electric Fields on the Ground Level Emission of GaN/AlGaN Multi-Quantum Wells

1999 ◽  
Vol 595 ◽  
Author(s):  
A. Bonfiglio ◽  
M. Lomascolo ◽  
G. Traetta ◽  
R. Cingolani ◽  
A. Di Carlo ◽  
...  
Keyword(s):  
Experimental Data ◽  
Quantum Wells ◽  
Electric Fields ◽  
Tight Binding ◽  
Ground Level ◽  
Analytic Model ◽  
Tight Binding Model ◽  
Binding Model ◽  
Emission Energy ◽  
Self Consistent

AbstractThe spectroscopic investigation of GaN/AlGaN quantum wells reveals that the emission energy of such structures is determined by four parameters, namely composition, well-width, strain and charge density. The experimental data obtained by varying these parameters are quantitatively explained by an analytic model based on the envelope function formalism which accounts for screening and built-in field, and by a full self-consistent tight-binding model.

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