Frequency-dependent current noise through quantum-dot spin valves

Matthias Braun, Jürgen König, and Jan Martinek
Phys. Rev. B 74, 075328 – Published 24 August 2006

Abstract

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.

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  • Received 17 January 2006

DOI:https://doi.org/10.1103/PhysRevB.74.075328

©2006 American Physical Society

Authors & Affiliations

Matthias Braun1, Jürgen König1, and Jan Martinek2,3,4

  • 1Institut für Theoretische Physik III, Ruhr-Universität Bochum, 44780 Bochum, Germany
  • 2Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 3Institut für Theoretische Festkörperphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
  • 4Institute of Molecular Physics, Polish Academy of Science, 60-179 Poznań, Poland

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Vol. 74, Iss. 7 — 15 August 2006

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