Pumping of Nuclear Spins by Optical Excitation of Spin-Forbidden Transitions in a Quantum Dot

被引：60

作者：

Chekhovich, E. A. ^{[1
,2
]}

Makhonin, M. N. ^{[1
]}

Kavokin, K. V. ^{[1
,3
]}

Krysa, A. B. ^{[4
]}

Skolnick, M. S. ^{[1
]}

Tartakovskii, A. I. ^{[1
]}

机构：

[1] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England

[2] Inst Solid State Phys, Chernogolovka 142432, Russia

[3] AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia

[4] Univ Sheffield, Dept Elect & Elect Engn, Sheffield S1 3JD, S Yorkshire, England

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 06期

基金：

英国工程与自然科学研究理事会;

关键词：

SINGLE-HOLE SPIN; STATE PREPARATION; POLARIZATION; ELECTRON; LOCKING;

D O I：

10.1103/PhysRevLett.104.066804

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We demonstrate that efficient optical pumping of nuclear spins in semiconductor quantum dots (QDs) can be achieved by resonant pumping of optically forbidden transitions. This process corresponds to one-to-one conversion of a photon absorbed by the dot into a polarized nuclear spin, and also has potential for initialization of hole spin in QDs. We find that by employing this spin-forbidden process, nuclear polarization of 65% can be achieved, markedly higher than from pumping the allowed transition, which saturates due to the low probability of electron-nuclear spin flip-flop.

引用

页数：4

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