Spin accumulation and spin relaxation in a large open quantum dot

被引：22

作者：

Koop, E. J. ^{[1
]}

van Wees, B. J. ^{[1
]}

Reuter, D. ^{[2
]}

Wieck, A. D. ^{[2
]}

van der Wal, C. H. ^{[1
]}

机构：

[1] Univ Groningen, Zernike Inst Adv Mat, Phys Nanodevices Grp, NL-9747 AG Groningen, Netherlands

[2] Ruhr Univ Bochum, Angew Festkorperphys, D-44780 Bochum, Germany

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.101.056602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report electronic control and measurement of an imbalance between spin-up and spin-down electrons in micron-scale open quantum dots. Spin injection and detection were achieved with quantum point contacts tuned to have spin-selective transport, with four contacts per dot for realizing a nonlocal spin-valve circuit. This provides an interesting system for studies of spintronic effects since the contacts to reservoirs can be controlled and characterized with high accuracy. We show how this can be used to extract in a single measurement the relaxation time for electron spins inside a ballistic dot (tau(sf) approximate to 300 ps) and the degree of spin polarization of the contacts (P approximate to 0.8).

引用

页数：4