Electrical control of spin relaxation in a quantum dot

被引：204

作者：

Amasha, S. ^{[1
]}

MacLean, K. ^{[1
]}

Radu, Iuliana P. ^{[1
]}

Zumbuehl, D. M. ^{[2
]}

Kastner, M. A. ^{[1
]}

Hanson, M. P. ^{[3
]}

Gossard, A. C. ^{[3
]}

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

[2] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland

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

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 04期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.100.046803

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We demonstrate electrical control of the spin relaxation time T-1 between Zeeman-split spin states of a single electron in a lateral quantum dot. We find that relaxation is mediated by the spin-orbit interaction, and by manipulating the orbital states of the dot using gate voltages we vary the relaxation rate W equivalent to T-1(-1) by over an order of magnitude. The dependence of W on orbital confinement agrees with theoretical predictions, and from these data we extract the spin-orbit length. We also measure the dependence of W on the magnetic field and demonstrate that spin-orbit mediated coupling to phonons is the dominant relaxation mechanism down to 1 T, where T-1 exceeds 1 s.

引用

页数：4

共 38 条

[31] Experimental signature of phonon-mediated spin relaxation in a two-electron quantum dot [J].