Phys. Rev. Lett. 103, 216402 (2009) [4 pages]Field-Induced Orbital Antiferromagnetism in Mott InsulatorsReceived 28 May 2009; published 19 November 2009 We report on a new electromagnetic phenomenon that emerges in Mott insulators. The phenomenon manifests as antiferromagnetic ordering due to orbital electric currents which are spontaneously generated from the coupling between spin currents and an external homogenous magnetic field. This novel spin-charge-current effect provides the mechanism to measure the so-far elusive spin currents by means of unpolarized neutron scattering, nuclear magnetic resonance or muon spectroscopy. We illustrate this mechanism by solving a half-filled Hubbard model on a frustrated ladder. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.216402
DOI:
10.1103/PhysRevLett.103.216402
PACS:
71.10.Fd, 72.80.Sk, 73.22.Gk, 74.25.Ha
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