Electron-Phonon Interaction in Semiconductor Spherical Quantum Dot Embedded in a Semiconductor Medium (HgS/CdS)

Abstract

Subject classification: 63.22.+m; 73.21.La; S8.11 Different types of electron (hole) ground energy level renormalization due to confined (L) and interface (I) phonons in a spherical quantum dot embedded in a semiconductor medium are investigated on the example of b-HgS/CdS nanoheterosystem. It is shown that for all QD sizes the shift of the ground energy level (D) is generally caused by the interaction of electron and confined phonons of the dot (L 0 ) and of the medium (L 1 ). The contribution of interface phonons (I + , I --) to the magnitude D is comparable with the contribution of L-phonons only at small QD radii (it is three times smaller). For all QD radii the interaction with all phonons through all states of the continuous spectrum gives a one order smaller contribution to D than the interaction through the states of the discrete spectrum. When the QD radius increases the I-phonon contribution decreases and the L-phonon one increases, consequently, the total shift becomes closer to its magnitude in bulk HgS crystal.

Exciton Spectrum of Hexagon Nanotube as Nanosensor Element

“…Екситонні спектри в напівпровідникових кван-тових точках, дротах і квантових плівках вивчають-ся вже тривалий час, тому результати теоретичних робіт з достатньо обґрунтованими моделями непо-гано узгоджуються з експериментальними даними [1][2][3][4][5][6][7].…”

“…Радіус внутрішнього кола відіграє роль варіаційного параметра. Різниця точного (3) й апроксимуючого (6) гамільтоніанів з простою залежністю і від просторових координат розглядається як збурення.…”

Properties of interface phonon spectra in complicated cylindrical nanosystem

“…The theory of quasiparticles spectra in single quantum dots, wires and wells embedded into the dielectric or semiconductor external medium have been established for the past few years [4][5][6] within the effective mass approximation and rectangular potentials for the electron, hole, exciton and dielectric continuum model for the phonons. The investigations of physical properties, such as carrier relaxation and transportation, linear and non-linear optical characteristics of quantum dots, the interaction between quasiparticles and phonons are carried out both experimentally and theoretically.…”

Electron energy spectra in an elliptic quantum wire and elliptic nanotube

“…These problems were solved by different authors both for simple and multilayered spherical and cylindrical semiconductor nanostructures [5,6]. Based on the analytical expressions derived for the quasi-particle wave functions, their interaction was investigated, and renormalization of the energy spectrum resulted from this interaction was calculated [7,8]. For many nanostructures of simple geometrical shape, no exact solutions of the Schrödinger equation can be obtained.…”