Dynamic nuclear polarization in a quantum Hall Corbino disk

被引：7

作者：

Kawamura, Minoru ^{[1
]}

Takahashi, Hiroyuki ^{[1
]}

Masubuchi, Satoru ^{[1
]}

Hashimoto, Yoshiaki ^{[2
]}

Katsumoto, Shingo ^{[2
,3
]}

Hamaya, Kohei ^{[1
,3
]}

Machida, Tomoki ^{[1
,3
]}

机构：

[1] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan

[2] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[3] Univ Tokyo, Inst Nano Quantum Informat Elect, Meguro Ku, Tokyo 1538505, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2008年 / 77卷 / 02期

关键词：

quantum Hall effect breakdown; dynamic nuclear polarization; hyperfine interaction;

D O I：

10.1143/JPSJ.77.023710

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Dynamic polarization of nuclear spins is studied in a Corbino disk under a breakdown regime of the quantum Hall effect (QHE). Since the edge channels are completely absent in the Corbino disk, we conclude that the electric current flowing in the bulk channel of a quantum Hall conductor is relevant to dynamic nuclear polarization (DNP). A pump and probe measurement demonstrates that DNP emerges near the critical voltage of the QHE breakdown. The agreement of the onset voltage of DNP with that of the QHE breakdown indicates that the underlying origin of DNP is closely related to that of the QHE breakdown.

引用

页数：3

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