Influence of Laser radiation on the absorption of a weak electronmagnetic wave by confined electrons in compositional superlatices (case of electron - acoustic phonons interaction)

- Influence of Laser radiation on the absorption of a weak electronmagnetic wave by confined electrons in compositional superlatices (case of.
- Survey interacting electron-phonon system in the compositional superlattices are present in the case of two electromagnetic waves is described.
- and  1 corresponds with the wall amplitude and frequency of electromagnetic waves has from the weak, and the corresponding amplitude and frequency of the laser radiation, t is time.
- The corresponding vector of the form 01.
- Hamiltonian of the electron-phonon system in the compositional superlattices is written as:.
- is the operator of birth, destruction of electronic state n p.
- b q  is the operator of birth, destruction of phonon state q.
- p  is the electron momentum vector in the plane perpendicular to the z-axis of compositional superlattices;.
- q  is the phonon frequency.
- is the energy of electrons in compositional superlattices.
- c is the speed of light.
- e is the electron charge..
- t is the electron distribution function.
- J  z is the Bessel functions of real numbers;.
- is the particle number operator of electrons;.
- is the particle number operator of electrons.
- From the quantum equation (4), Bessel functions and developed using Fourier transfer spectrum obtained analytic expressions for the absorption coefficient  near.
- which V O is the normalized volume (selected V O  1.
- is the electric constant strain,.
- n is the width of the first mini n, d is the super-cycle superlattices.
- n the energy levels in the isolated pits.
- L z the width of the isolated holes.
- k B is the Boltzmann constant.
- T is the absolute temperature.
- n 0 is the carrier concentration.
- is the angle between two vectors of electromagnetic waves.
- is the Kronecker symbol..
- Survey of the compositional superlattices GaAs - Al 0.3 Ga 0.7 As .
- Observed in the temperature region from 320K to 365K strongest dependence, the absorption coefficient decreased rapidly with the energy of electromagnetic waves with the same key and value temperature absorption coefficient value as positive, negative, even is zero.
- This means that the absorption coefficient in the coefficient was converted to increase and it shows the difference compared with conventional semiconductors..
- From the Hamiltonian equations of electron-phonon system, has developed the quantum equations and get the expression for the coefficient absorption of weak electromagnetic waves by confined electron in the compositional superlattices in the presence of laser radiation field .
- In the case of near threshold to get analytical expressions for the absorption coefficient for the mechanism of electron- acoustic phonons interaction.
- The results showed that the absorption coefficient depends on the complexity of the system temperature, amplitude and frequency of the weak and electromagnetic wave laser radiation.
- Also depends strongly on the parameters characteristic of the superlattice.
- Nguyen Quang Bau, Nguyen Vu Nhan, Tran Cong Phong (2003), Jounal of the Korean Physical Society, Vol.42, No.5 -647..
- Nguyen Quang Bau, Tran Cong Phong (1998), J Phys.
- Nguyen Quang Bau, Tran Cong Phong, Jounal of the Korean Physical Society, Vol..
- Nguyen Quang Bau, Do Manh Hung (2009), Jounal of the Korean Physical Society, Vol