Theory of single spin detection with STM

Details Theory of single spin detection with STM Theory of single spin detection with STM

2001-12-21

arxiv.org/abs/cond-mat/0112407v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Discussion of the back-action and few new referencies added; 5 pages latex file, 2 eps figures

Scientific paper

We propose a mechanism for detection of a single spin center on a non-magnetic substrate. In the detection scheme, the STM tunnel current is correlated with the spin orientation. In the presence of magnetic field, the spin precesses and the tunnel current is modulated at the Larmor frequency. The mechanism relies on the effective spin-orbit interaction between the injected unpolarized STM current and the local spin center, which leads to the nodal structure of the spatial signal profile. Based on the proposed mechanism, the strongest spin-related signal can be expected for the systems with large spin-orbit coupling and low carrier concentration.

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