Control and detection of singlet-triplet mixing in a random nuclear field

被引：481

作者：

Koppens, FHL

Folk, JA

Elzerman, JM

Hanson, R

van Beveren, LHW

Vink, IT

Tranitz, HP

Wegscheider, W

Kouwenhoven, LP

Vandersypen, LMK

机构：

[1] Delft Univ Technol, Kavli Inst Nanosci, NL-2600 GA Delft, Netherlands

[2] Univ Regensburg, Inst Angew & Expt Phys, D-8400 Regensburg, Germany

来源：

SCIENCE | 2005年 / 309卷 / 5739期

关键词：

D O I：

10.1126/science.1113719

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We observed mixing between two-electron singlet and triplet states in a double quantum dot, caused by interactions with nuclear spins in the host semiconductor. This mixing was suppressed when we applied a small magnetic field or increased the interdot tunnel coupling and thereby the singlet-triplet splitting. Electron transport involving transitions between triplets and singlets in turn polarized the nuclei, resulting in marked bistabilities. We extract from the fluctuating nuclear field a [imitation on the time-averaged spin coherence time T*(2) of 25 nanoseconds. Control of the electron-nuclear interaction will therefore be crucial for the coherent manipulation of individual electron spins.

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页码：1346 / 1350

页数：5

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