Nonlinear spin filter for nonmagnetic materials at zero magnetic field

Spin injection in silicon at zero magnetic field

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Parahydrogen-induced polarization at zero magnetic field.

We use symmetry arguments and simple model systems to describe the conversion of the singlet state of parahydrogen into an oscillating sample magnetization at zero magnetic field. During an initial period of free evolution governed by the scalar-coupling Hamiltonian HJ, the singlet state is converted into scalar spin order involving spins throughout the molecule. A short dc pulse along the z ax...

Level statistics of XXZ spin chains under zero magnetic field

Abstract. Level statistics is discussed for XXZ spin chains under zero magnetic field for some values of the next-nearest-neighbour (NNN) coupling parameter. We show how the level statistics of the finite-size systems depends on the NNN coupling and the XXZ anisotropy, which should reflect competition among quantum chaos, integrability and finite-size effects. Evaluating the level-spacing distr...

Observation of spin diffusion in zero-field magnetic resonance.

Long-lived heteronuclear spin-singlet states in liquids at a zero magnetic field.

We report an observation of long-lived spin-singlet states in a 13C-1H spin pair in a zero magnetic field. In 13C-labeled formic acid, we observe spin-singlet lifetimes as long as 37 s, about a factor of 3 longer than the T1 lifetime of dipole polarization in the triplet state. In contrast to common high-field experiments, the observed coherence is a singlet-triplet coherence with a lifetime T2...