Quantum Spin Tomography in Ferromagnet-Normal Conductors
P. Samuelsson, Arne Brataas
TL;DR
This paper develops a quantum spin tomography method to reconstruct non-local spin correlations in ferromagnet-normal conductors using current cross correlation measurements, revealing universal behaviors and effects of spin-flip scattering.
Contribution
It introduces a comprehensive theory for quantum spin tomography in ferromagnet-normal conductors, enabling complete reconstruction of non-local spin correlations.
Findings
Non-local spin correlations are universal and strong with normal injectors.
Spin-flip scattering suppresses non-local correlations.
Higher injector polarization reduces correlations in ferromagnetic injectors.
Abstract
We present a theory for a complete reconstruction of non-local spin correlations in ferromagnet-normal conductors. This quantum spin tomography is based on cross correlation measurements of electric currents into ferromagnetic terminals with controllable magnetization directions. For normal injectors, non-local spin correlations are universal and strong. The correlations are suppressed by spin-flip scattering and, for ferromagnetic injectors, by increasing injector polarization.
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