| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Quantum-Confined Stark Effect in Ensemble of Colloidal Semiconductor Quantum Dots |
| WANG Zhi-Bing1, ZHANG Hui-Chao1, ZHANG Jia-Yu1**, Huaipeng Su2, Y. Andrew Wang2 |
1Department of Electronic Engineering, Southeast University, Nanjing 210096
2Ocean Nanotech, LLC, Springdale AR 72764, USA
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| Cite this article: |
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WANG Zhi-Bing, ZHANG Hui-Chao, ZHANG Jia-Yu et al 2010 Chin. Phys. Lett. 27 127803 |
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Abstract The presence of a strong, changing, randomly-oriented, local electric field, which is induced by the photo-ionization that occurs universally in colloidal semiconductor quantum dots (QDs), makes it difficult to observe the quantum-confined Stark effect in ensemble of colloidal QDs. We propose a way to inhibit such a random electric field, and a clear quantum-confined Stark shift is observed directly in close-packed colloidal QDs. Besides the applications in optical switches and modulators, our experimental results indicate how the oscillator strengths of the optical transitions are changed under external electric fields.
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| Keywords:
78.20.Jq
78.55.Et
78.67.Hc
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Received: 26 May 2010
Published: 23 November 2010
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[1] Miller D A B et al 1984 Phys. Rev. Lett. 53 2173
[2] See, for example, Helman N C, Roth J E, Bour D P, Altug H and Miller D A B 2005 IEEE J. Sel. Top. Quantum Electron. 11 338
[3] Kuo Y H, Lee Y K et al 2005 Nature 437 1334
[4] Leitsmann R and Bechstedt F 2008 Phys. Rev. B 78 205324
Leitsmann R and Bechstedt F 2009 Phys. Rev. B 80 165402
Wen G W, Lin J Y, Jiang H X and Chen Z 1995 Phys. Rev. B 52 5913
[5] Empedocles S A and Bawendi M G 1997 Science 278 2114
[6] Colvin V L, Cunningham K L and Alivisatos A P 1994 J. Chem. Phys. 101 7122
Sacra A, Norris D J, Murray C B and Bawendi M G 1995 J. Chem. Phys. 103 5236
[7] Fry P W, Itskevich I E, Parnell S R, Finley J J, Wilson L R et al 2000 Phys. Rev. B 62 16784
Fry P W, Itskevich I E, Mowbray D J, Skolnick M S, Finley J J, Barker J A et al 2000 Phys. Rev. Lett. 84 733
[8] Ngo C Y, Yoon S F, Loke W K, Cao Q, Lim D R, Wong V, Sim Y K and Chua S J 2008 Nanoscale Res. Lett. 3 486
[9] Nirmal M, Dabbousi B O, Bawendi M G, Macklin J J et al 1996 Nature 383 802
[10] Krauss T D and Brus L E 1999 Phys. Rev. Lett. 83 4840
[11] Klimov V I, Mikhailovsky A A, McBranch D W, Leatherdale C A, Bawendi M G 2000 Science 287 1011
[12] Heyes C D, Kobitski A Y, Breus V V and Nienhaus G U 2007 Phys. Rev. B 75 125431
[13] Kuno M, Fromm D P, Johnson S T, Gallagher A and Nesbitt D J 2003 Phys. Rev. B 67 125304
[14] Sugisaki M, Ren H, Nair S V, Nishi K and Masumoto Y 2002 Phys. Rev. B 66 235309
[15] Sun Q, Wang Y A, Li L S, Wang D, Zhu T, Xu J, Yang C and Li Y 2007 Nature Photonics 1 717
[16] Scholes G D and Rumbles G 2006 Nature Mater. 5 683
[17] Dabbousi B O, Bawendi M G, Onitsuka O and Rubner M F 1995 Appl. Phys. Lett. 66 1316
[18] Zhao J, Zhang J, Jiang C, Bohnenberger J, Basche T and Mews A 2004 J. Appl. Phys. 96 3206
[19] Yan L, Zhang JY, Cui Y and Qiao Y 2007 Appl. Phys. Lett. 91 243114
[20] See, for example, Califano M, Franceschetti A and Zunger A 2005 Nano Lett. 5 2360
[21] Hu J, Li L, Yang W, Manna L, Wang L and Alivisatos A P 2001 Science 292 2060
[22] Polland H J, Schultheis L, Kuhl J, Gobel E O and Tu C W 1985 Phys. Rev. Lett. 55 2610
[23] Mendez E E, Bastard G, Chang L L, Esaki L, Morkoc H and Fischer R 1982 Phys. Rev. B 26 7101
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