Electron-phonon interaction in a dielectric slab: Effect of the electronic polarizability

Unified treatment of coupled optical and acoustic phonons in piezoelectric cubic materials

“…It must be noted that interface phonons are not captured in the plots as they correspond to imaginary q x values, but the procedure for finding them is the same as for nonpiezoelectric and isotropic media [27].…”

“…It is demonstrated in a first unified approach that optical and acoustic phonons are inherently coupled in piezoelectric materials, and we compare with the existing literature in the field where optical and acoustic phonons are treated separately [27][28][29][30][31]. This coupling of optical and acoustic phonons is important for the understanding of electron-phonon interaction selection rules in piezoelectric materials and, e.g., Raman scattering processes.…”

Acousto-optical phonon excitation in cubic piezoelectric slabs and crystal growth orientation effects

“…Classically, previous treatments of phonons have typically used isotropic assumptions and have treated acoustic and optical phonons separately [23][24][25]. It has been shown that the exclusion of anisotropy and the piezoelectric effect leads to significant changes in the phonon dispersion curves for a piezoelectric slab, and that, due to the piezoelectric coupling, certain acoustic phonons are coupled with the electric potential and hence interact with electromagnetic waves, termed acousto-optical phonons [26].…”

Energy Loss Rate of Hot Electrons Due to Confined and Interface Optical Phonons in Semiconductor Quantum Wells in Quantizing Magnetic Field

“…Since the early observation of confined and interface optical phonons in GaAs/AlAs superlattices [6 to 9] various models have been proposed to describe the electron interaction with confined and interface optical phonon modes in multiple quantum wells and superlattices. The models frequently used to describe confined modes, in literature, are Fuchs and Kliewer's slab modes or dielectric continuum model [10,11], Ridley's guided mode model [12] and Huang and Zhu's (HZ) microscopic lattice dynamic model [13]. These models differ in the way the boundary conditions are imposed on electrostatic potential and vibrational amplitude of phonons at the interfaces.…”

“…These approximations are expected to be reasonable for steady state measurements of ELR on low density samples in an external electric field such that the energy of the electron is smaller than the inter-subband energy separation. For the sake of completeness and comparison we also present the ELR due to slab mode [10,11] and guided mode [12] models. The paper is organized as follows.…”