Effect of Nonlinear Elasticity on Interband and Intersubband Transition Energies in GaN/AlN Superlattices

• Authors: S. Łepkowski
• Languages of publication: EN

Abstracts

EN

We present a theoretical study of the effect of nonlinear elasticity on interband and intersubband transition energies in wurtzite GaN/AlN superlattices. The effect of nonlinear elasticity is considered by taking into account the changes of elastic constants caused by the intrinsic hydrostatic pressure, originating from lattice misfit between constituents of the superlattice. We show that the influence of the effect of the nonlinear elasticity on the interband and intersubband transition energies in the GaN/AlN superlattices depends crucially on the strain state of structures, in particular on the in-plane lattice constant of the buffer or the substrate. For the superlattices strained to AlGaN buffers with small aluminum concentrations, the effect of nonlinear elasticity increases significantly the interband transition energy and decreases the intersubband transition energy. For the superlattices strained to AlGaN buffers with large aluminum concentrations, the effect of nonlinear elasticity leads to a decrease in the interband transition energy and an increase in the intersubband transition energy.

Keywords

EN

78.67.Pt; 62.20.Dc; 77.65.Ly; 77.65.-j

Discipline

• 77.65.Ly: Strain-induced piezoelectric fields
• 78.67.Pt: Multilayers; superlattices; photonic structures; metamaterials(see also 81.05.Xj, Metamaterials for chiral, bianisotropic and other complex media)
• 77.65.-j: Piezoelectricity and electromechanical effects

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2007
• Volume: 112
• Issue: 2
• Pages: 315-319

Dates

published

2007-08

received

2007-06-09

Contributors

author

S. Łepkowski

• Unipress, Institute of High Pressure Physics, Polish Academy of Sciences, Sokołowska 29, 01-142 Warszawa, Poland

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Identifiers

DOI

10.12693/APhysPolA.112.315