EXCITONS IN CONFINED SYSTEMS - FROM QUANTUM-WELL TO BULK BEHAVIOR

被引：42

作者：

ANDREANI, LC

DANDREA, A

DELSOLE, R

机构：

[1] CNR, IST METODOL AVANZATE INORGANICHE, I-00016 MONTEROTONDO, ITALY

[2] UNIV ROMA TOR VERGATA 2, DIPARTIMENTO FIS, I-00173 ROME, ITALY

来源：

PHYSICS LETTERS A | 1992年 / 168卷 / 5-6期

关键词：

D O I：

10.1016/0375-9601(92)90535-T

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A theoretical study of excitons in CuCl films is presented, which is valid for both L approximately a(B) and L much greater than a(B), where L is the well width and a(B) is the exciton radius. Exciton binding energies and oscillator strengths are calculated, and the effect of the different dielectric constant of the barrier is studied in detail. The oscillator strength as a function of wen width is shown to have a minimum at L approximately 3a(B). The radiative lifetime of free excitons is calculated. For thin wells, thermalization produces a radiative lifetime which is linear in temperature. For wide wells, the lifetime becomes independent of well width and proportional to T3/2.

引用

页码：451 / 459

页数：9