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5 papers · 1 filter
Two-orbital Kondo effect in quantum dot coupled to ferromagnetic leads
Hitoshi Yoshizumi, Kensuke Inaba, Tomoko Kita +1
We study the Kondo effect of a two-orbital vertical quantum dot (QD) coupled to two ferromagnetic leads by employing an equation of motion method. When the ferromagnetic leads are…
Numerical-Diagonalization Study of Spin Gap Issue of the Kagome Lattice Heisenberg Antiferromagnet
Hiroki Nakano, Toru Sakai
We study the system size dependence of the singlet-triplet excitation gap in the kagome-lattice Heisenberg antiferromagnet by numerical diagonalization. We successfully obt…
Frustration-Induced Ferrimagnetism in S=1/2 Heisenberg Spin Chain
Tokuro Shimokawa, Hiroki Nakano
The ground-state properties of the S=1/2 frustrated Heisenberg spin chain with interactions up to fourth nearest neighbors are investigated by the exact-diagonalization method and…
Critical magnetization behaviors of the triangular and Kagome lattice quantum antiferromagnets
Toru Sakai, Hiroki Nakano
We investigate the quantum spin antiferromagnets on the triangular and Kagome lattices in magnetic field, using the numerical exact diagonalization. Particularly we focus o…
Collapse of Ferrimagnetism in Two-Dimensional Heisenberg Antiferromagnet due to Frustration
Hiroki Nakano, Tokuro Shimokawa, Toru Sakai
We study ferrimagnetism in the ground state of the antiferromagnetic Heisenberg model on the spatially anisotropic kagome lattice, in which ferrimagnetism of the conventional Lieb-…