Ultrafast spin dynamics in colloidal ZnO quantum dots

被引：37

作者：

Janssen, Nils ^{[1
,2
]}

Whitaker, Kelly M. ^{[3
,4
]}

Gamelin, Daniel R. ^{[3
,4
]}

Bratschitsch, Rudolf ^{[1
,2
]}

机构：

[1] Univ Konstanz, Dept Phys, D-78464 Constance, Germany

[2] Univ Konstanz, Ctr Appl Photon, D-78464 Constance, Germany

[3] Univ Washington, Dept Chem, Seattle, WA 98195 USA

[4] Univ Washington, Ctr Nanotechnol, Seattle, WA 98195 USA

来源：

NANO LETTERS | 2008年 / 8卷 / 07期

关键词：

D O I：

10.1021/nl801057q

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Time-resolved Faraday rotation measurements in the ultraviolet have been performed to reveal the ultrafast spin dynamics of electrons in colloidal ZnO quantum dots. Oscillating Faraday rotation signals are detected at frequencies corresponding to an effective g factor of g* = 1.96. Biexponential oscillation decay is observed that is due to (i) rapid depopulation of the fundamental exciton (iota = 250 ps) and (ii) slow electron spin dephasing (T-2* = 1.2 ns) within a metastable state formed by hole-trapping at the quantum dot surface.

引用

页码：1991 / 1994

页数：4

共 30 条

[1]

Awschalom DD, 2002, NANOSCI TECHNOL, P147

[2] Initialization and read-out of spins in coupled core-shell quantum dots [J].

Berezovsky, J. ;

Gywat, O. ;

Meier, F. ;

Battaglia, D. ;

Peng, X. ;

Awschalom, D. D. .

NATURE PHYSICS, 2006, 2 (12) :831-834

[3] Electron spin coherence in n-doped CdTe/CdMgTe quantum wells [J].

Bratschitsch, R. ;

Chen, Z. ;

Cundiff, S. T. ;

Zhukov, E. A. ;

Yakovlev, D. R. ;

Bayer, M. ;

Karczewski, G. ;

Wojtowicz, T. ;

Kossut, J. .

APPLIED PHYSICS LETTERS, 2006, 89 (22)

[4] Recipes for spin-based quantum computing [J].

Cerletti, V ;

Coish, WA ;

Gywat, O ;

Loss, D .

NANOTECHNOLOGY, 2005, 16 (04) :R27-R49

[5] Effects of disorder on electron spin dynamics in a semiconductor quantum well [J].

Chen, Zhigang ;

Carter, Sam G. ;

Bratschitsch, Rudolf ;

Dawson, Philip ;

Cundiff, Steven T. .

NATURE PHYSICS, 2007, 3 (04) :265-269

[6] Optical transitions in artificial few-electron atoms strongly confined inside ZnO nanocrystals [J].

Germeau, A ;

Roest, AL ;

Vanmaekelbergh, D ;

Allan, G ;

Delerue, C ;

Meulenkamp, EA .

PHYSICAL REVIEW LETTERS, 2003, 90 (09) :4

[7] Room-temperature spin coherence in ZnO [J].

Ghosh, S ;

Sih, V ;

Lau, WH ;

Awschalom, DD ;

Bae, SY ;

Wang, S ;

Vaidya, S ;

Chapline, G .

APPLIED PHYSICS LETTERS, 2005, 86 (23) :1-3

[8] Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots [J].

Greilich, A. ;

Oulton, R. ;

Zhukov, E. A. ;

Yugova, I. A. ;

Yakovlev, D. R. ;

Bayer, M. ;

Shabaev, A. ;

Efros, Al. L. ;

Merkulov, I. A. ;

Stavarache, V. ;

Reuter, D. ;

Wieck, A. .

PHYSICAL REVIEW LETTERS, 2006, 96 (22)

[9] Spin dynamics in semiconductor nanocrystals [J].

Gupta, JA ;

Awschalom, DD ;

Efros, AL ;

Rodina, AV .

PHYSICAL REVIEW B, 2002, 66 (12) :1253071-12530712

[10] Spin coherence in semiconductor quantum dots [J].

Gupta, JA ;

Awschalom, DD ;

Peng, X ;

Alivisatos, AP .

PHYSICAL REVIEW B, 1999, 59 (16) :10421-10424

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