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Ab Initio Study of the Intrinsic Exchange Bias at the SrRuO/SrMnO Interface
Shuai Dong, Qinfang Zhang, Seiji Yunoki +2
In a recent publication (S. Dong et al., Phys. Rev. Lett.103, 127201 (2009)), two (related) mechanisms were proposed to understand the intrinsic exchange bias present in oxides het…
First-principles study of the spin-mixing conductance in Pt/NiFe junctions
Qinfang Zhang, Shin-ichi Hikino, Seiji Yunoki
Based on the spin-pumping theory and first-principles calculations, the spin-mixing conductance (SMC) is theoretically studied for Pt/Permalloy (NiFe, Py) junctions.…
Dynamical spin structure factors of quantum spin nematic states
Ryuichi Shindou, Seiji Yunoki, Tsutomu Momoi
Dynamical spin structure factors of quantum spin nematic states are calculated in a spin-1/2 square-lattice J1-J2 model with ferromagnetic J1 and competing antiferromagnetic J2 int…
Anomalous enhancement of spin Hall conductivity in superconductor/normal metal junction
S. Hikino, S. Yunoki
We propose a spin Hall device to induce a large spin Hall effect in a superconductor/normal metal (SN) junction. The side jump and skew scattering mechanisms are both taken into ac…
Microscopic Study of Electronic and Magnetic Properties for Ir Oxide
Tomonori Shirakawa, Hiroshi Watanabe, Seiji Yunoki
The exact diagonalization and the variational cluster approximation (VCA) are used to study the nature of a novel Mott insulator induced by a strong spin-orbit coupling for a two-d…
Projective studies of spin nematics in a quantum frustrated ferromagnet
Ryuichi Shindou, Seiji Yunoki, Tsutomu Momoi
We study the ground state properties of the spin-1/2 frustrated ferromagnetic J1-J2 Heisenberg model on the square lattice, employing projected BCS wavefunctions with spin-triplet…
Strain driven onset of non-trivial topological insulating states in Zintl Sr compounds (=Pb, Sn)
Yan Sun, Xing-Qiu Chen, Dianzhong Li +4
We explore the topological behavior of the binary Zintl phase of the alkaline earth metals based compounds SrPb and SrSn using both standard and hybrid density functional t…
Performance Acceleration of Kernel Polynomial Method Applying Graphics Processing Units
Shixun Zhang, Shinichi Yamagiwa, Masahiko Okumura +1
The Kernel Polynomial Method (KPM) is one of the fast diagonalization methods used for simulations of quantum systems in research fields of condensed matter physics and chemistry.…
Multiferroic Properties of CaMnO
Guoquan Zhang, Shuai Dong, Zhibo Yan +5
We report that CaMnO is a new magnetic multiferroic material. The appearance of a ferroelectric polarization coinciding with the magnetic phase transition ( K) s…