Magnetic-field enhancement of interface-phonon effects on quasi-two-dimensional magnetopolarons

Abstract

The binding energy of a polaron confined in the quantum well of GaAs/Ga& "Al"As double heterostructures is calculated as a function of the magnetic field applied in the direction of growth. We have also calculated the oscillator strength of electron-phonon interaction for transitions from various excited states to the ground state of the polaron. Every type of optical-phonon mode that can exist in such structures within the continuum model is considered separately. It is found that the magnetic field 0 greatly enhances the interface-phonon part of the polaron effect. For quantum wells of widths 150 A or smaller, the interface modes dominate all polaronic phenomena we have encountered when B~1 T. For 0 quantum wells of widths up to 100 A, contributions from confined bulk phonon modes are almost negligible in magnetic fields B~1 T.

Magnetopolaron effect in CdTe cylindrical quantum dot

“…This behavior has been shown in previous studies. 23,33 The exact nature of the dependence of the binding energy on the impurity position along the radial direction, the axial direction, the magnetic field, and the polaronic effect inside the cylindrical QD is presented in Fig. 3.…”

Influence of Electric and Magnetic Fields on the Polaron in a Quantum Well

“…In terms of these harmonic-oscillator operators, the electron Hamiltonian H e in Eq. ( 2) can (14) be rewritten as…”

“…Ridleyt 13 ' investigated the mixing mode effect of such electron-phonon system. Generally speaking, the IO mode contribution to polaron energy becomes insignificant when the well width (d) is greater then 60 AJ 14 ' However, this part of polaron energy enhances drastically when the magnetic or electric field is applied for the well of d < 200 j^ [15,16] j n fo^ ^jjg importance of IO phonon is shown for confined polaron states in the quasi-low-dimensional systems.^1 7 ' 18 ' Usually, the external field not only provides a powerful way to investigate the properties of crystal, but also produces some wonderful phenomena, such as superconductivity, quantum Hall effect and Aharonov-Bohm effect. Therefore, it is very necessary and interesting to study the influence of electric and magnetic fields on the polaron of various optical modes in the quantum well.…”

Polaronic Effects of an Exciton in a Cylindrical Quantum Wire

“…Because of their many properties different from bulk system structures, the investigation on low-dimensional semiconductor has attracted much interest in recent years. In particular, there are a great deal of works devoted to the study of the electronphonon interactions in QW, [2,3] in QWW, [4−6] and in QD. [7,8] Because an exciton is closely related to optical properties and easy to be observed in experiment, the investigation on the electric and optical properties of an exciton in a low-dimensional quantum system has attracted much attention.…”