What is the origin of very strong photoluminescence in ZnSe/BeTe superlattices at liquid helium temperature?

被引：10

作者：

Mino, H ^{[1
]}

Fujikawa, A

Akimoto, R

Takeyama, S

机构：

[1] Chiba Univ, Grad Sch Sci & Technol, Chiba 2638522, Japan

[2] Photon Res Inst, AIST, Ibaraki 3058568, Japan

[3] Chiba Univ, Fac Sci, Dept Phys, Chiba 2638522, Japan

[4] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

来源：

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2004年 / 22卷 / 1-3期

关键词：

photoluminescence; exciton; ZnSe/BeTe; superlattice; type-II band structure;

D O I：

10.1016/j.physe.2003.12.089

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The spatially indirect photoluminescence (PL) has been investigated in ZnSe/BeTe superlattices at various temperatures and exciting light intensities. At the temperature region higher than 15 K the PL spectrum showed two peak structures; one is attributed to localized states and another has free excitonic features. At liquid helium temperature the latter component became dominant and very strong PL which is irrelevant to a built-in electric field normal to the hetero-interfaces is observed. As possible origins of the anomalous PL, exciton complex or excitonic condensation states are proposed. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：640 / 643

页数：4

共 20 条

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