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We study a model for the observed phenomenon of electron spin resonance (ESR)at the Zeeman frequency as seen by a scanning tunneling microscope (STM) viaits current noise. The model for this ESR-STM phenomenon allows the STM currentto flow in two arms of a nanoscopic interferometer, one arm has directtunneling from the tip to the substrate while the second arm has tunnelingthrough two spin states. We evaluate analytically the noise spectrum fornon-polarized leads, as relevant to the experimental setup. We show thatspin-orbit interactions allow for an interference of two tunneling pathsresulting in a resonance effect.

Nanoscopic interferometer model for spin resonance in current noise