Abstract
We study the influence of an additional uncontrolled (stray) magnetic field upon the measurement of long-range spin-spin interaction strength of two spin-1/2 valence electrons bound in two separate ions at well-defined distances from each other. This stray field, which is neither perpendicular nor parallel to the line connecting two ions, could appear due to the Earth magnetic field, or, due to the slight angular misalignment between the applied magnetic field and the line connecting two ions. It is found that the presence of the stray magnetic field plays an important role in the dynamics of the spin-states of two electrons. If neglected in the analysis, moreover, such a stray field may affect the measurement of the spin-spin interaction strength, especially at smaller inter-spin distances.
Highlights
The spin-spin interaction is one of the basic interaction of electrons that arises from the coupling between the internal spin-magnetic moments of two electrons
Further interest in these spin-spin interactions arises from the applications in spintronics and quantum computation [15], electron spin resonance spectroscopy [16], as well as in the search for a new physics [17]
We have shown the variation in the measured spin-spin interaction strength defined by equation (12) with the magnitude of external stray field B^ as a function of inter-ion distance
Summary
The spin-spin interaction is one of the basic interaction of electrons that arises from the coupling between the internal spin-magnetic moments of two electrons. The interaction among two electron spins has been investigated recently in several experiments, for instance with nitrogen-vacancy (spin defects) in diamond [7,8,9,10], dopant atoms in semiconductors [11], single-molecule magnets in break junctions [12], bound electrons in two separated ions [13], as well as atoms in a scanning tunneling microscope [14] Further interest in these spin-spin interactions arises from the applications in spintronics and quantum computation [15], electron spin resonance spectroscopy [16], as well as in the search for a new physics [17]
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