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고동욱(Dongwook Go),이현우(Hyun-Woo Lee) 한국자기학회 2017 韓國磁氣學會誌 Vol.27 No.5
We present a concise method to understand electric field response of electrons in the presence of spin-momentum coupling for a general two-band model. When there is no impurity scattering, the electric field response is solely described by the change of electronic wavefunctions since the electronic occupation remains unchanged. We found that this can be neatly described by a unitary transformation, which depends on both momentum and spin. Thus, it gives rise to gauge structures for both position and spin operators, which allows one to understand spin-orbit torque and anomalous Hall effect as consequences of the spin and position gauge effects, and spin Hall effect as a combined consequence of the two. As an example, we present a result for a model system with both Rashba interaction and s-d exchange interaction, which is a commonly used model to describe a thin magnetic layer.
Narayanapillai, Kulothungasagaran,Go, Gyungchoon,Ramaswamy, Rajagopalan,Gopinadhan, Kalon,Go, Dongwook,Lee, Hyun-Woo,Venkatesan, Thirumalai,Lee, Kyung-Jin,Yang, Hyunsoo American Physical Society 2017 Physical Review B Vol.96 No.6
<P>We report the angular dependence of magnetoresistance in the two-dimensional electron gas at the LaAlO3/SrTiO3 interface. We find that this interfacial magnetoresistance exhibits a similar angular dependence to the spin Hall magnetoresistance observed in ferromagnet/heavy metal bilayers, which has been so far discussed in the framework of the bulk spin Hall effect of the heavy metal layer. The observed magnetoresistance is in qualitative agreement with a theoretical model calculation including both Rashba spin-orbit coupling and an exchange interaction. Our result suggests that magnetic interfaces subject to spin-orbit coupling can generate a non-negligible contribution to the spin Hall magnetoresistance, and the interfacial spin-orbit coupling effect is therefore key to the understanding of various spin-orbit-coupling-related phenomena in magnetic/nonmagnetic bilayers.</P>