Zobrazeno 1 - 10
of 170
pro vyhledávání: '"Ohta, Yukinori"'
We present a detailed investigation of the XXZ Heisenberg model for spin-$1/2$ and spin-$1$ systems on square and honeycomb lattices. Utilizing the density-matrix renormalization group (DMRG) method, complemented by Spiral Boundary Conditions (SBC) f
Externí odkaz:
http://arxiv.org/abs/2404.08099
Publikováno v:
J. Phys. Soc. Jpn. 92, 055001 (2023)
We estimate phase boundaries of four ordered and two spin-liquid phases for the spin-$\frac{1}{2}$ Kitaev-Heisenberg (KH) model using four kinds of relatively-small clusters, based on the second derivative of ground-state energy. The estimated values
Externí odkaz:
http://arxiv.org/abs/2304.08422
Publikováno v:
J. Phys. Soc. Jpn. 92, 023701 (2023)
We propose an efficient numerical method to obtain local order parameter in two-dimensional systems using spiral boundary conditions. As a benchmark, we first estimate the magnitude of staggered magnetization for the $S=1/2$ XXZ Heisenberg model on a
Externí odkaz:
http://arxiv.org/abs/2211.09560
Publikováno v:
Phys. Rev. B 107, L081104 (2023)
We introduce spiral boundary conditions (SBCs) as a useful tool for handling the shape of finite-size periodic clusters. Using SBCs, a lattice model for more than two dimensions can be exactly projected onto a one-dimensional (1D) periodic chain with
Externí odkaz:
http://arxiv.org/abs/2205.15775
Publikováno v:
Phys. Rev. B 105. L241108 (2022)
To study excitonic effects on high-harmonic generation (HHG) in Mott insulators, we investigate pumped nonequilibrium dynamics in the one-dimensional extended Hubbard model. By employing time-dependent calculations based on the exact diagonalization
Externí odkaz:
http://arxiv.org/abs/2205.06390
Using the three-orbital Hubbard model, we investigate the low-energy excitation spectra in the antiferromagnetic phase of Ca$_2$RuO$_4$. We calculate the dynamical susceptibilities in the low-energy region by the random phase approximation and find t
Externí odkaz:
http://arxiv.org/abs/2202.07956
Autor:
Shiomi, Manabu, Kojima, Keita, Katayama, Naoyuki, Maeda, Shin, Schneeloch, John A., Yamamoto, Syunsuke, Sugimoto, Koudai, Ohta, Yukinori, Louca, Despina, Okamoto, Yoshihiko, Sawa, Hiroshi
Publikováno v:
Phys. Rev. B 105, L041103 (2022)
We report on the charge-ordered structure of LiRh2O4 arising below the metal-insulator transition at 170 K. Structural studies using synchrotron X-rays have revealed that the charge-ordered states of Rh3+ and Rh4+ with dimerization are realized in th
Externí odkaz:
http://arxiv.org/abs/2112.07118
We study the effect of anisotropy of spin-$S$ impurities on an antiferromagnetic SU(2) Heisenberg chain. The magnetic impurities are assumed to have an XXZ-type anisotropic exchange with its neighboring sites. First, using density-matrix renormalizat
Externí odkaz:
http://arxiv.org/abs/2109.00777
Publikováno v:
Phys. Rev. B 104, 245103 (2021)
We study third-harmonic generation (THG) in an excitonic insulator (EI) described in a two-band correlated electron model. Employing the perturbative expansion with respect to the external electric field, we derive the THG susceptibility taking into
Externí odkaz:
http://arxiv.org/abs/2108.02469
Autor:
Matsubayashi, Kazuyuki, Okamura, Hidekazu, Mizokawa, Takashi, Katayama, Naoyuki, Nakano, Akitoshi, Sawa, Hiroshi, Kaneko, Tatsuya, Toriyama, Tatsuya, Konishi, Takehisa, Ohta, Yukinori, Arima, Hiroto, Yamanaka, Rina, Hisada, Akihiko, Okada, Taku, Ikemoto, Yuka, Moriwaki, Taro, Munakata, Koji, Nakao, Akiko, Nohara, Minoru, Lu, Yangfan, Takagi, Hidenori, Uwatoko, Yoshiya
Publikováno v:
J. Phys. Soc. Jpn. 90, 074706 (2021)
The excitonic insulator Ta$_2$NiSe$_5$ experiences a first-order structural transition under pressure from rippled to flat layer-structure at Ps = 3 GPa, which drives the system from an almost zero-gap semiconductor to a semimetal. The pressure-induc
Externí odkaz:
http://arxiv.org/abs/2106.04396