Far-infrared excitations below the Kohn mode: Internal motion in a quantum dot

被引：26

作者：

Krahne, R

Gudmundsson, V

Heyn, C

Heitmann, D

机构：

[1] Univ Hamburg, Inst Angew Phys, D-20355 Hamburg, Germany

[2] Univ Hamburg, Zentrum Mikrostrukturforsch, D-20355 Hamburg, Germany

[3] Univ Iceland, Inst Sci, IS-107 Reykjavik, Iceland

来源：

PHYSICAL REVIEW B | 2001年 / 63卷 / 19期

关键词：

D O I：

10.1103/PhysRevB.63.195303

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have investigated the far-infrared response of quantum dots in modulation doped GaAs heterostructures. We observe modes at frequencies below the center-of-mass Kohn mode. Comparison with Hartree-random-phase-approximation calculations show that these modes arise from the flattened potential in our held-effect confined quantum dots. They reflect pronounced relative motion of the charge density with respect to the center of mass.

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