DIRECT OBSERVATION OF MINIBAND-EDGE SINGULARITIES IN THE OPTICAL-SPECTRA OF GAAS/ALAS SUPERLATTICES

被引：16

作者：

FUJIWARA, K

KAWASHIMA, K

YAMAMOTO, T

SANO, N

CINGOLANI, R

GRAHN, HT

PLOOG, K

机构：

[1] ATR,OPT & RADIO COMMUN RES LAB,KYOTO,KYOTO 61902,JAPAN

[2] KWANSEIGAKUIN UNIV,DEPT PHYS,NISHINOMIYA,HYOGO 662,JAPAN

[3] UNIV LECCE,DEPT MAT SCI,I-73100 LECCE,ITALY

[4] PAUL DRUDE INST FESTKORPERELEKTR,D-10177 BERLIN,GERMANY

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 03期

关键词：

D O I：

10.1103/PhysRevB.49.1809

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Band-edge optical transitions in GaAs/AlAs superlattices with different miniband widths are investigated by low-temperature-photocurrent, photoluminescence-excitation, and reflectance spectroscopy. Direct spectroscopic evidence is given for excitonic effects at saddle-type critical points which are related to M(1) Van Hove singularities at the upper miniband edges, for both heavy-hole and light-hole excitons. Excellent agreement is obtained between the observed transition energies and the miniband widths deduced from Kronig-Penney model calculations.

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页码：1809 / 1812

页数：4

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