Direct observation of controlled coupling in an individual quantum dot molecule

被引：345

作者：

Krenner, HJ

Sabathil, M

Clark, EC

Kress, A

Schuh, D

Bichler, M

Abstreiter, G

Finley, JJ

机构：

[1] Univ Munich, Walter Schottky Inst, D-85748 Garching, Germany

[2] Univ Munich, Dept Phys, D-85748 Garching, Germany

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.94.057402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the direct observation of quantum coupling in individual quantum dot molecules and its manipulation using static electric fields. A pronounced anticrossing of different excitonic transitions is observed as the electric field is tuned. A comparison of our experimental results with theory shows that the observed anticrossing occurs between excitons with predominant spatially direct and indirect character and reveals a field driven transition of the nature of the molecular ground state exciton wave function. Finally, the interdot quantum coupling strength is deduced optically and its dependence on the interdot separation is calculated.

引用

页码：1 / 4

页数：4

共 18 条

[1] Coupling and entangling of quantum states in quantum dot molecules [J].

Bayer, M ;

Hawrylak, P ;

Hinzer, K ;

Fafard, S ;

Korkusinski, M ;

Wasilewski, ZR ;

Stern, O ;

Forchel, A .

SCIENCE, 2001, 291 (5503) :451-453

[2]

Beham E, 2004, PHYS STATUS SOLIDI C, V1, P2131, DOI 10.1002/pssc.200404764

[3] Theory of excitonic spectra and entanglement engineering in dot molecules [J].

Bester, G ;

Shumway, J ;

Zunger, A .

PHYSICAL REVIEW LETTERS, 2004, 93 (04) :047401-1

[4] Quantum information processing with semiconductor macroatoms [J].

Biolatti, E ;

Iotti, RC ;

Zanardi, P ;

Rossi, F .

PHYSICAL REVIEW LETTERS, 2000, 85 (26) :5647-5650

[5] Exciton dephasing in quantum dot molecules [J].

Borri, P ;

Langbein, W ;

Woggon, U ;

Schwab, M ;

Bayer, M ;

Fafard, S ;

Wasilewski, Z ;

Hawrylak, P .

PHYSICAL REVIEW LETTERS, 2003, 91 (26) :267401-267401

[6] Quantum-confined Stark shifts of charged exciton complexes in quantum dots [J].

Finley, JJ ;

Sabathil, M ;

Vogl, P ;

Abstreiter, G ;

Oulton, R ;

Tartakovskii, AI ;

Mowbray, DJ ;

Skolnick, MS ;

Liew, SL ;

Cullis, AG ;

Hopkinson, M .

PHYSICAL REVIEW B, 2004, 70 (20) :201308-1

[7] Inverted electron-hole alignment in InAs-GaAs self-assembled quantum dots [J].

Fry, PW ;

Itskevich, IE ;

Mowbray, DJ ;

Skolnick, MS ;

Finley, JJ ;

Barker, JA ;

O'Reilly, EP ;

Wilson, LR ;

Larkin, IA ;

Maksym, PA ;

Hopkinson, M ;

Al-Khafaji, M ;

David, JPR ;

Cullis, AG ;

Hill, G ;

Clark, JC .

PHYSICAL REVIEW LETTERS, 2000, 84 (04) :733-736

[8] An all-optical quantum gate in a semiconductor quantum dot [J].

Li, XQ ;

Wu, YW ;

Steel, D ;

Gammon, D ;

Stievater, TH ;

Katzer, DS ;

Park, D ;

Piermarocchi, C ;

Sham, LJ .

SCIENCE, 2003, 301 (5634) :809-811

[9] Nonuniform composition profile in In0.5Ga0.5As alloy quantum dots [J].

Liu, N ;

Tersoff, J ;

Baklenov, O ;

Holmes, AL ;

Shih, CK .

PHYSICAL REVIEW LETTERS, 2000, 84 (02) :334-337

[10] Fine structure of excitons in InAs/GaAs coupled quantum dots: A sensitive test of electronic coupling [J].

Ortner, G ;

Bayer, M ;

Larionov, A ;

Timofeev, VB ;

Forchel, A ;

Lyanda-Geller, YB ;

Reinecke, TL ;

Hawrylak, P ;

Fafard, S ;

Wasilewski, Z .

PHYSICAL REVIEW LETTERS, 2003, 90 (08) :4

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