Excitonic emission of THz radiation: Experimental evidence of the shortcomings of the Bloch equation method

被引：44

作者：

Bolivar, PH ^{[1
]}

Wolter, F ^{[1
]}

Muller, A ^{[1
]}

Roskos, HG ^{[1
]}

Kurz, H ^{[1
]}

Kohler, K ^{[1
]}

机构：

[1] FRAUNHOFER INST APPL SOLID STATE PHYS,D-79108 FREIBURG,GERMANY

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 11期

关键词：

STARK LADDER; SEMICONDUCTOR SUPERLATTICES; OSCILLATIONS;

D O I：

10.1103/PhysRevLett.78.2232

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

THz-emission experiments are presented which demonstrate a limitation of the semiconductor Bloch equations (SEE) for the description of the Coulomb interaction in semiconductors optically excited near the band gap. In a narrow-miniband superlattice, the field dependence of the THz emission frequency shows an anticrossing behavior characteristic for excitonic transitions. This proves the dominance of excitonic contributions, contradicting predictions based upon the SEE. The data support recent theoretical work which elucidated that the inherent Hartree-Fock approximation of the SEE can lead to an incorrect description of the Coulomb interaction.

引用

页码：2232 / 2235

页数：4

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