Multisubband Plasmons in Doped ZnO Quantum Wells

被引：19

作者：

Bajo, Miguel Montes ^{[1
]}

Tamayo-Arriola, Julen ^{[1
]}

Hugues, Maxime ^{[2
]}

Ulloa, Jose M. ^{[1
]}

Le Biavan, Nolwenn ^{[2
]}

Peretti, Romain ^{[3
]}

Julien, Francois H. ^{[4
]}

Faist, Jerome ^{[3
]}

Chauveau, Jean-Michel ^{[2
]}

Hierro, Adrian ^{[1
]}

机构：

[1] Univ Politecn Madrid, ISOM, E-28040 Madrid, Spain

[2] Univ Cote dAzur, CNRS, CRHEA, F-06560 Valbonne, France

[3] Swiss Fed Inst Technol, Inst Quantum Elect, Zurich, Switzerland

[4] Univ Paris Saclay, Univ Paris Sud, Orsay C2N, Ctr Nanosci & Nanotechnol,CNRS, F-91405 Orsay, France

来源：

PHYSICAL REVIEW APPLIED | 2018年 / 10卷 / 02期

基金：

欧盟地平线“2020”;

关键词：

INFRARED RADIATION; ABSORPTION; INVERSION; FIELD;

D O I：

10.1103/PhysRevApplied.10.024005

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Intersubband (ISB) transitions are of high significance for light-emitting and light-detecting devices in the infrared and, when involving large electron densities, for plasmonics and strong light-matter coupling physics. Here it is observed that the simultaneously occurring fundamental and excited-state ISB transitions in highly-doped, m-plane ZnO/MgxZn1-xO multiple quantum wells, couple into a single collective oscillation: the multisubband plasmon (MSP). With 2D electron densities up to 4 x 101(3) cm(-2), an outstanding regime is reached in which the observed MSP frequency is three times larger than that of the fundamental ISB transition as a result of depolarization. This effect is analyzed using a dielectric tensor for ZnO including the interaction of the light with the lattice, the in-plane free electrons, and the off-plane MSP. The impact of the broadening of the MSP and its interaction with phonons is discussed. The results presented here show the potential of ZnO/MgxZn1-xO for infrared optoelectronic applications, which can be extended to the THz range with appropriate design of the quantum wells.

引用

页数：8

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