CHONG-DER HU2018-09-102018-09-10200810980121http://www.scopus.com/inward/record.url?eid=2-s2.0-43549083015&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/340440We studied the microscopic mechanism of multiferroics, in particular, with the "spin current" model. Starting from a system with helical spin configuration, we solved for the forms of the electron wave functions and analyzed their characteristics. The relation between ferroelectricity and Dzyaloshinskii-Moriya interaction is clearly established. There is also a simple relation between the electric polarization and the wave vector of magnetic orders. Finally, we show that the bond-bending existing in transition metal oxides can enhance ferroelectricity. © 2008 The American Physical Society.Relationship between ferroelectricity and Dzyaloshinskii-Moriya interaction in multiferroics and the effect of bond-bendingjournal article10.1103/PhysRevB.77.1744182-s2.0-43549083015WOS:000256763800072