日本物理学会
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作者:Masashige Matsumoto , Kosuke Chimata , Mikito Koga
来源:[J].Journal of the Physical Society of Japan(IF 2.087), 2017, Vol.86 (3)JPS
摘要:Spin-dependent electric dipole operators are investigated group-theoretically for the emergence of an electric dipole induced by a single spin or by two spins, where the spin dependences are completely classified up to the quadratic order. For a single spin, a product of spin ope...
作者:Mikito Koga , Masashige Matsumoto , Hiroaki Kusunose
来源:[J].Journal of the Physical Society of Japan(IF 2.087), 2016, Vol.85 (6)JPS
摘要:We study an orbitally degenerate Kondo effect in a triangular triple quantum dot (TTQD), where the three dots are connected vertically with a single metallic lead through electron tunneling. Both spin and orbital degrees of freedom play an important role in the SU(4) Kondo e...
作者:Ryo Sakaguchi , Masashige Matsumoto
来源:[J].Journal of the Physical Society of Japan(IF 2.087), 2016, Vol.85 (10)JPS
摘要:Magnetic excitation in a spin dimer system on a bilayer honeycomb lattice is investigated in the presence of a zigzag edge, where disordered and ordered phases can be controlled by a quantum phase transition. In analogy with the case of graphene with a zigzag edge, a flat edge ma...
作者:Mikito Koga , Masashige Matsumoto , Hiroaki Kusunose
来源:[J].Journal of the Physical Society of Japan(IF 2.087), 2017, Vol.86 (5)JPS
摘要:We study the local antisymmetric spin–orbit (ASO) coupling effect on spin, orbital, and charge degrees of freedom for the Kondo effect in a triangular triple quantum dot (TTQD). Here, one of the three QDs is coupled to a metallic lead through electron tunneling, and a local ...
作者:Mikito Koga , Masashige Matsumoto
来源:[J].Journal of the Physical Society of Japan(IF 2.087), 2019, Vol.88 (3)JPS
摘要:Crystal field triplet ground states in f 2 configurations such as Pr ions have quadrupolar coupling as well as magnetic coupling to conduction electrons, leading to a nontrivial non-Fermi liquid Kondo physics associated with quadrupole degrees of freedom. In particular...
作者:Mikito Koga , Masashige Matsumoto
来源:[J].Journal of the Physical Society of Japan(IF 2.087), 2020, Vol.89 (2)JPS
摘要:Motivated by the recent progress of phonon-mediated control in quantum spin devices, we propose a possibility of hybrid measurement using electron paramagnetic resonance (EPR) and a surface acoustic wave (SAW). Considering quadrupole-strain (QS) couplings suggested for silicon va...
作者:Masashige Matsumoto , Minoru Soda , Takatsugu Masuda
来源:[J].Journal of the Physical Society of Japan(IF 2.087), 2013, Vol.82 (9)JPS
摘要:In integer spin systems with a strong easy-plane type single-ion anisotropy, a paramagnetic ground state is stabilized with a finite excitation gap. Applying a magnetic field or pressure can collapse the excitation gap and induce quantum phase transition into a magnetically ...
作者:Masashige Matsumoto
来源:[J].Journal of the Physical Society of Japan(IF 2.087), 2015, Vol.84 (3)JPS
摘要:Magnetic excitation in the interacting spin dimer system NH4CuCl3 is investigated on the basis of an extended spin-wave theory, assuming a doubled unit cell with four dimer sublattices of inequivalent intradimer interactions as suggested by neutron scat...
作者:Masashige Matsumoto
来源:[J].Journal of the Physical Society of Japan(IF 2.087), 2014, Vol.83 (8)JPS
摘要:Electromagnon excitation is investigated on the basis of the symmetric spin-dependent electric polarization in both collinear and noncollinear magnetically ordered states. We focus on quantum spin systems with a large easy-plane single-ion anisotropy, where both massive long...

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