Frequency-dependent current noise through quantum-dot spin valves

被引：65

作者：

Braun, Matthias ^{[1
]}

Koenig, Juergen

Martinek, Jan

机构：

[1] Ruhr Univ Bochum, Inst Theoret Phys 3, D-44780 Bochum, Germany

[2] Tohoku Univ, Mat Res Inst, Sendai, Miyagi 9808577, Japan

[3] Univ Karlsruhe, Inst Theoret Festkorperphys, D-76128 Karlsruhe, Germany

[4] Polish Acad Sci, Inst Mol Phys, PL-60179 Poznan, Poland

来源：

PHYSICAL REVIEW B | 2006年 / 74卷 / 07期

关键词：

SINGLE-ELECTRON TRANSISTOR; ZERO-BIAS ANOMALIES; SHOT-NOISE; MESOSCOPIC CONDUCTORS; COHERENT TRANSPORT; TUNNEL-JUNCTION; RATE-EQUATIONS; SYSTEMS; BLOCKADE; SPECTRUM;

D O I：

10.1103/PhysRevB.74.075328

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study frequency-dependent current noise through a single-level quantum dot connected to ferromagnetic leads with noncollinear magnetization. We propose to use the frequency-dependent Fano factor as a tool to detect single-spin dynamics in the quantum dot. Spin precession due to an external magnetic and/or a many-body exchange field affects the Fano factor of the system in two ways. First, the tendency towards spin-selective bunching of the transmitted electrons is suppressed, which gives rise to a reduction of the low-frequency noise. Second, the noise spectrum displays a resonance at the Larmor frequency, whose line shape depends on the relative angle of the leads' magnetizations.

引用

页数：13

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