Quantum dot molecules realized with modulated quantum wire heterostructrues

被引：6

作者：

Zhu, Qing ^{[1
]}

Karlsson, Fredrik ^{[1
]}

Rudra, Alok ^{[1
]}

Pelucchi, Emanuele ^{[1
]}

Kapon, Eli ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, Lab Phys Nanostruct, CH-1015 Lausanne, Switzerland

来源：

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2008年 / 40卷 / 06期

关键词：

quantum dot; quantum wire; quantum dot molecules; micro-photoluminescence;

D O I：

10.1016/j.physe.2007.10.017

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We report on double-quantum dot (QD) molecules realized with modulated quantum wire (QWR) heterostructures by self-limiting growth of AlGaAs alloys in inverted tetrahedral pyramids. The QWR barriers connecting the dots facilitate the tunnel-coupling between the confined carriers. Evidences for the presence of such coupling are provided by conventional micro-photoluminescence measurements and theoretical modeling. Systematically tuning the relative QD sizes in the QD molecules reveals spectral line splitting consistent with the expected level splitting due to carrier hybridization. Prospects for extension of these structures to larger QD superlattices are discussed. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：1815 / 1818

页数：4

共 8 条

[1] Quantum light emission of two lateral tunnel-coupled (In,Ga)As/GaAs quantum dots controlled by a tunable static electric field [J].

Beirne, GJ ;

Hermannstädter, C ;

Wang, L ;

Rastelli, A ;

Schmidt, OG ;

Michler, P .

PHYSICAL REVIEW LETTERS, 2006, 96 (13)

[2] Broken symmetry and quantum entanglement of an exciton in InxGa1-xAs/GaAs quantum dot molecules -: art. no. 075325 [J].

Bester, G ;

Zunger, A ;

Shumway, J .

PHYSICAL REVIEW B, 2005, 71 (07)

[3] Observation of exciton molecule consisting of two different excitons in coupled quantum dots [J].

Goshima, K ;

Yamauchi, S ;

Komori, K ;

Morohashi, I ;

Sugaya, T .

APPLIED PHYSICS LETTERS, 2005, 87 (25) :1-3

[4] Fine structure in the excitonic emission of InAs/GaAs quantum dot molecules -: art. no. 125335 [J].

Ortner, G ;

Yugova, I ;

von Högersthal, GBH ;

Larionov, A ;

Kurtze, H ;

Yakovlev, DR ;

Bayer, M ;

Fafard, S ;

Wasilewski, Z ;

Hawrylak, P ;

Lyanda-Geller, YB ;

Reinecke, TL ;

Babinski, A ;

Potemski, M ;

Timofeev, VB ;

Forchel, A .

PHYSICAL REVIEW B, 2005, 71 (12)

[5] Spin fine structure of optically excited quantum dot molecules [J].

Scheibner, M. ;

Doty, M. F. ;

Ponomarev, I. V. ;

Bracker, A. S. ;

Stinaff, E. A. ;

Korenev, V. L. ;

Reinecke, T. L. ;

Gammon, D. .

PHYSICAL REVIEW B, 2007, 75 (24)

[6] Optical signatures of coupled quantum dots [J].

Stinaff, EA ;

Scheibner, M ;

Bracker, AS ;

Ponomarev, IV ;

Korenev, VL ;

Ware, ME ;

Doty, MF ;

Reinecke, TL ;

Gammon, D .

SCIENCE, 2006, 311 (5761) :636-639

[7] Transition from two-dimensional to three-dimensional quantum confinement in semiconductor quantum wires/quantum dots [J].

Zhu, Q. ;

Karlsson, K. F. ;

Pelucchi, E. ;

Kapon, E. .

NANO LETTERS, 2007, 7 (08) :2227-2233

[8] Alloy segregation, quantum confinement, and carrier capture in self-ordered pyramidal quantum wires [J].

Zhu, Q. ;

Pelucchi, E. ;

Dalessi, S. ;

Leifer, K. ;

Dupertuis, M. -A. ;

Kapon, E. .

NANO LETTERS, 2006, 6 (05) :1036-1041

← 1 →