Optical properties of ZnSe using linear response theory.

Area of Science:

• Condensed matter physics
• Materials science
• Computational materials science

Background:

• Understanding the electronic structure and optical properties of semiconductor materials like Zinc Selenide (ZnSe) is crucial for optoelectronic applications.
• Accurate theoretical prediction of optical response requires sophisticated computational approaches.

Purpose of the Study:

• To investigate the electronic structure and optical response of ZnSe using first-principles calculations.
• To apply linear response theory with novel kernels (bootstrap and long-range contribution) for optical property calculations.
• To develop a method for determining material-dependent parameters in theoretical models.

Main Methods:

• First-principles full-potential linearized augmented plane wave (FP-LAPW) method for electronic structure.
• Linear response theory with bootstrap (BS) and long-range contribution (LRC) kernels for optical response.
• Empirical pseudopotential method (EPM) for material-dependent parameter determination.

Main Results:

• Calculated the electronic band structure and ground state properties of ZnSe.
• Obtained optical properties including dielectric function, refractive index, reflectivity, and absorption coefficient.
• The proposed LRC kernel parameterization shows results comparable to the BS kernel and experimental data.

Conclusions:

• The first-principles calculations accurately predict the electronic and optical properties of ZnSe.
• The novel application of LRC kernels in conjunction with a developed parameterization scheme provides reliable optical response data.
• The study validates the computational approach for ZnSe and suggests its applicability to other materials.