Exciton footprint of self-assembled AlGaAs quantum dots in core-shell nanowires

被引：24

作者：

Fontana, Yannik ^{[1
]}

Corfdir, Pierre ^{[2
]}

Van Hattem, Barbara ^{[2
]}

Russo-Averchi, Eleonora ^{[1
]}

Heiss, Martin ^{[1
]}

Sonderegger, Samuel ^{[3
]}

Magen, Cesar ^{[4
,5
]}

Arbiol, Jordi ^{[6
,7
]}

Phillips, Richard T. ^{[2
]}

Fontcuberta i Morral, Anna ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, Inst Mat, Lab Mat Semicond, CH-1015 Lausanne, Switzerland

[2] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[3] Attolight AG, CH-1015 Lausanne, Switzerland

[4] Univ Zaragoza, Inst Nanociencia Aragon, Lab Microscopias Avanzadas, Zaragoza 50018, Spain

[5] Univ Zaragoza, Dept Fis Mat Condensada, Zaragoza 50018, Spain

[6] CSIC, ICMAB, Inst Catalana Recerca & Estudis Avancats, E-08193 Bellaterra, Catalonia, Spain

[7] CSIC, ICMAB, Inst Ciencia Mat Barcelona, E-08193 Bellaterra, Catalonia, Spain

来源：

PHYSICAL REVIEW B | 2014年 / 90卷 / 07期

基金：

英国工程与自然科学研究理事会;

关键词：

SINGLE-PHOTON SOURCE; GAAS NANOWIRES; FINE-STRUCTURE; HETEROSTRUCTURES; EMISSION;

D O I：

10.1103/PhysRevB.90.075307

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Quantum-dot-in-nanowire systems constitute building blocks for advanced photonics and sensing applications. The electronic symmetry of the emitters impacts their function capabilities. Here we study the fine structure of gallium-rich quantum dots nested in the shell of GaAs-Al-0.51 Ga-0.49 As core-shell nanowires. We used optical spectroscopy to resolve the splitting resulting from the exchange terms and extract the main parameters of the emitters. Our results indicate that the quantum dots can host neutral as well as charged excitonic complexes and that the excitons exhibit a slightly elongated footprint, with the main axis tilted with respect to the long axis of the host nanowire. GaAs-AlxGa1-xAs emitters in a nanowire are particularly promising for overcoming the limitations set by strain in other systems, with the benefit of being integrated in a versatile photonic structure.

引用

页数：9

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