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Research & Reviews : Journal of Physics

Theoretical Study of Surface Excitations at Planar Surface of Zinc Selenide (ZnSe)

  1. Daya Shanker
  2. Arjun Mishra

Abstract

ZnSe is a II-VI semiconductor material and has very novel properties. So it is currently demanding for various applications. Dispersion relation is employed here to study the elementary surface excitations at the planar surface of Zinc Selenide (ZnSe) semiconductor. These excitations are of various types such as plasmons, phonons, excitons etc. Plasmons are the quanta of valence electron oscillations, phonons are the quanta of lattice vibrations and excitons are the quanta of electron-hole pair oscillations. When an em wave is incident on the planar surface of semiconductor material, plasmons, phonons, excitons are excited under the possible conditions for each. Photons are the quanta of incident em wave and photon can couple with them in resonance condition, generating surface modes. From the dispersion relation, frequency-dependent dielectric function  is obtained and for the existence of the surface waves, the frequency-dependent dielectric function  should be negative. Here two frequency modes are obtained and  where the frequency of incident electro-magnetic (em) is wave and  is the plasma frequency for ZnSe. It is found that for this semiconductor material, the coupled plasmon-phonon-photon surface wave exists when < 0.41and the other mode  remains nearly constant at 0.0016331. In this study the surface oscillatory mode  is obtained in visible range (1015Hz) and it is also remarkable that this obtained frequency mode is very close to ultra-violet (UV) (1016Hz) range. The other mode  is found in infra-red (IR) (1013Hz) range. The frequency range has great role in various modern scientific techniques and sophisticated devices. ZnSe is useful in light emitting diodes (LEDs), sensors, photodetectors and various other places. These studies on different materials have potential to led science community for making new devices and techniques in number of fields. The field of spectroscopy such as Raman spectroscopy and others can also take advantage of it.

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