Control of nonlinear optical properties in composite asymmetric exponential potential quantum wells: Influence of quantum well width and external fields

Sayrac H., AL E. B., Salman-Durmuslar A., UNGAN F.

Physics Letters, Section A: General, Atomic and Solid State Physics, cilt.586, 2026 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 586
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1016/j.physleta.2026.131708
  • Dergi Adı: Physics Letters, Section A: General, Atomic and Solid State Physics
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex, INSPEC, MathSciNet, Philosopher's Index, zbMATH
  • Anahtar Kelimeler: Electric and magnetic field, Quantum well, Relative refractive index change, Total optical absorption coefficient
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

This study presents a theoretical investigation of nonlinear optical properties in a composite asymmetric exponential potential quantum well, focusing on intersubband transitions between the two lowest energy states. Nonlinear optical rectification, second harmonic generation, total optical absorption, and refractive index changes are analyzed. The effects of quantum well width are examined in the absence of external fields, followed by an exploration of the influence of applied electric and magnetic fields. Subband energy levels and wavefunctions are obtained by numerically solving the Schrödinger equation using the diagonalization method within the effective mass approximation. The results show that both the position and amplitude of resonant peaks in the nonlinear optical coefficients can be tuned through structural parameters and external fields. These variations arise from changes in energy levels and wavefunction distributions, demonstrating that the optical response of the system can be effectively controlled, enabling tunable optoelectronic applications in the terahertz range.