Effect of exchange interaction on spin dephasing in a double quantum dot

被引：66

作者：

Laird, E. A. ^{[1
]}

Petta, J. R.

Johnson, A. C.

Marcus, C. M.

Yacoby, A.

Hanson, M. P.

Gossard, A. C.

机构：

[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[2] Weizmann Inst Sci, Dept Condensed Matter Phys, IL-76100 Rehovot, Israel

[3] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.97.056801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We measure singlet-triplet dephasing in a two-electron double quantum dot in the presence of an exchange interaction which can be electrically tuned from much smaller to much larger than the hyperfine energy. Saturation of dephasing and damped oscillations of the spin correlator as a function of time are observed when the two interaction strengths are comparable. Both features of the data are compared with predictions from a quasistatic model of the hyperfine field.

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页数：4

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