117 citations · 460 across the 14 of their papers we have counts for
14 papers
Microplasma generation by slow microwave in an electromagnetically induced transparency-like metasurface
Yasuhiro Tamayama, Osamu Sakai
Microplasma generation using microwaves in an electromagnetically induced transparency (EIT)-like metasurface composed of two types of radiatively coupled cut-wire resonators with…
Optical Evidence of Itinerant-Localized Crossover of Electrons in Cerium Compounds
Shin-ichi Kimura, Yong Seung Kwon, Yuji Matsumoto +2
Cerium (Ce)-based heavy-fermion materials have a characteristic double-peak structure (mid-IR peak) in the optical conductivity [] spectra originating from the strong conduct…
Band Calculations for Ce Compounds with AuCu-type Crystal Structure on the basis of Dynamical Mean Field Theory II. - CeIn and CeSn
Osamu Sakai, Hisatomo Harima
Band calculations for Ce compounds with the AuCu-type crystal structure were carried out on the basis of dynamical mean field theory (DMFT). The results of applying the calcu…
Spiral magnetic structure in spin-5/2 frustrated trimerized chains in SrMn3P4O14
Masashi Hase, Vladimir Yu. Pomjakushin, Lukas Keller +7
We study a spin-5/2 antiferromagnetic trimerized chain substance SrMn3P4O14 using neutron powder diffraction experiments. The coplanar spiral magnetic structure appears below T_N1…
Band Calculations for Ce Compounds with AuCu-type Crystal Structure on the basis of Dynamical Mean Field Theory I. CePd and CeRh
Osamu Sakai
Band calculations for Ce compounds with the AuCu-type crystal structure were carried out on the basis of dynamical mean field theory (DMFT). The auxiliary impurity problem wa…
Invariant Form of Hyperfine Interaction with Multipolar Moments - Observation of Octupolar Moments in NpO and CeB by NMR -
Osamu Sakai, Ryousuke Shiina, Hiroyuki Shiba
The invariant form of the hyperfine interaction between multipolar moments and the nuclear spin is derived, and applied to discuss possibilities to identify the antiferro-octupolar…
Change of Electronic Structure Induced by Magnetic Transitions in CeBi
Shin-ichi Kimura, Mitsuru Okuno, Hideaki Kitazawa +2
The temperature dependence of the electronic structure of CeBi arising from two types of antiferromagnetic transitions based on optical conductivity () was observed. The $σ(ω…
Study on the Kondo effect in the tunneling phenomena through a quantum dot
Osamu Sakai, Wataru Izumida
We review our recent studies on the Kondo effect in the tunneling phenomena through quantum dot systems. Numerical methods to calculate reliable tunneling conductance are developed…
Two-Impurity Kondo Effect in Double-Quantum-Dot Systems - Effect of Interdot Kinetic Exchange Coupling
Wataru Izumida, Osamu Sakai
Tunneling conductance through two quantum dots, which are connected in series to left and right leads, is calculated by using the numerical renormalization group method. As the hop…
Kondo Effect in Single Quantum Dot Systems --- Study with Numerical Renormalization Group Method ---
Wataru Izumida, Osamu Sakai, Yukihiro Shimizu
The tunneling conductance is calculated as a function of the gate voltage in wide temperature range for the single quantum dot systems with Coulomb interaction. We assume that two…
Single Impurity Anderson Model with Coulomb Repulsion between Conduction Electrons on the Nearest-Neighbour Ligand Orbital
Ryu Takayama, Osamu Sakai
We study how the Kondo effect is affected by the Coulomb interaction between conduction electrons on the basis of a simplified model. The single impurity Anderson model is extended…
Many Body Effects on Electron Tunneling through Quantum Dots in an Aharonov-Bohm Circuit
Wataru Izumida, Osamu Sakai, Yukihiro Shimizu
Tunneling conductance of an Aharonov-Bohm circuit including two quantum dots is calculated based on the general expression of the conductance in the linear response regime of the b…
An Extended Anderson Model that shows Decreasing Resistivity with Decreasing Temperature
S. Suzuki, O. Sakai, Y. Shimizu
The resistivity for an extended two channel Anderson model is calculated. When the temperature decreases, it decreases logarithmically, and has T^1/2 anomaly at very low temperatur…
Numerical Renormalization-Group Study of Particle-Hole Symmetry Breaking in Two-Channel Kondo Problem : Effect of Repulsion between Conduction Electrons and Potential Scattering
H. Kusunose, K. Miyake, Y. Shimizu +1
Particle-hole symmetry breaking perturbation in two-channel pseudospin Kondo problem is studied by the numerical renormalization-group method. It is shown that the repulsion betwee…