Temperature dependence of exciton localization in Zn1−xCdxSe quantum wells

Abstract

Articles you may be interested inComment on "High efficient biexciton photoluminescence observed from single ZnCdSe quantum wells with continuous wave cold carrier generation" [Appl.High efficient biexciton photoluminescence observed from single ZnCdSe quantum wells with continuous wave cold carrier generation Observation of biexcitonic effect in single ZnCdSe quantum well under very low excitation density

Room‐Temperature Yellow Emission of a High Cd Content (x = 0.70), Highly Strained, Layer‐by‐Layer Grown Zn1−xCdxSe/ZnSe Quantum Well

“…The peak energy evolution evidences the migration of excitons to regions with lower Cd content (higher emission energy); this process is assisted by acoustic phonons with increasing temperature. [ 21 ] From Figure 6 we observe that the migration process starts at ≈70 K. At RT, the emission energy shifts to 2.179 eV; the calculations indicate that this energy is associated to regions with ≈63% Cd content. As the RT thermal energy is ≈26 meV, the RT emission energy is higher than that expected by thermally induced migration effects initiated in regions with ≈70% Cd content.…”

Determination of the minimum island size for full exciton localization due to thickness fluctuations in Zn1−Cd Se quantum wells

“…Calculations were made for two structurally different Znl-xCdxSe QWs [2,6,7]. The parameters used in calculation are listed in Table 1.…”

“…Bound excitons (BX) [3] and biexcitons (BB) [4,5] have been assigned to optical transitions in the PL spectra of ZnI _ 1 Cd, Se QWs. In previous papers we have analyzed in detail the mechanisms of exciton localization and exciton migration as a function of temperature for the case of two structurally different Zn -,Cd, Se QWs grown by molecular beam epitaxy (MBE) with different barrier materials [2,6,7]. Based on those studies we have made estimates of the relative total area of islands with different thickness, but that analysis does not give information about the area of individual islands [2].…”

Nonlocal supersymmetric deformations of periodic potentials

“…To summarize, let us underline again an intriguing role of the translational invariance, which can appear either as an exact or approximate and/or asymptotic effect. This is an exceptional situation when the most elementary symmetry transformation, the unitary but nonlocal finite displacements, can be implemented by Darboux transformations typically producing local but non-unitary effects, a phenomenon specially convenient for the exact description of the contact effects (tentatively, including tiny quantum wells [39]). …”