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Abstract: We proposed that in multiferroics there exists a third long range orderbesides the electric polarization and magnetic order. This long range orderreduces the symmetry of the spatial part of the wave functions of electrons.Thus the cancellation in the spin current- model can be avoided. As a result,the expectation value of electric polarization will be larger by an order ofmagnitude. We have derived a new form of electric polarization \vec{P}-\vec{Q}\times\vec{s i}\times\vec{s {j+1}} where \vec{Q} is the wave vectorof this long range order



Author: C. D. Hu

Source: https://arxiv.org/







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