Zobrazeno 1 - 10
of 1 094
pro vyhledávání: '"Tohyama T"'
Publikováno v:
Phys. Rev. Research 2, 023024 (2020)
We present numerical results for finite-temperature $T>0$ thermodynamic quantities, entropy $s(T)$, uniform susceptibility $\chi_0(T)$ and the Wilson ratio $R(T)$, for several isotropic $S=1/2$ extended Heisenberg models which are prototype models fo
Externí odkaz:
http://arxiv.org/abs/1912.00876
Autor:
Miyamoto, T., Kakizaki, T., Terashige, T., Hata, D., Yamakawa, H., Morimoto, T., Takamura, N., Yada, H., Takahashi, Y., Hasegawa, T., Matsuzaki, H., Tohyama, T., Okamoto, H.
Publikováno v:
Communications Physics 2 (2019) 131
Mott insulators sometimes show dramatic changes in their electronic states after photoirradiation, as indicated by photoinduced Mott-insulator-to-metal transition. In the photoexcited states of Mott insulators, electron wavefunctions are more delocal
Externí odkaz:
http://arxiv.org/abs/1907.13338
Publikováno v:
Phys. Rev. B 97, 014412 (2018)
Spin-1/2 Heisenberg model on kagome lattice is a typical frustrated quantum spin system. A basic structure of kagome lattice is also present in kagome-strip lattice in one dimension, where a similar type of frustration is expected. We thus study the
Externí odkaz:
http://arxiv.org/abs/1710.00508
Autor:
Fujihala, M., Sugimoto, T., Tohyama, T., Mitsuda, S., Mole, R. A., Yu, D. H., Yano, S., Inagaki, Y., Morodomi, H., Kawae, T., Sagayama, H., Kumai, R., Murakami, Y., Tomiyasu, K., Matsuo, A., Kindo, K.
Publikováno v:
Phys. Rev. Lett. 120, 077201 (2018)
Fedotovite K$_2$Cu$_3$O(SO$_4$)$_3$ is a candidate of new quantum spin systems, in which the edge-shared tetrahedral (EST) spin-clusters consisting of Cu$^{2+}$ are connected by weak inter-cluster couplings to from one-dimensional array. Comprehensiv
Externí odkaz:
http://arxiv.org/abs/1709.06405
Publikováno v:
Phys. Rev. B 97, 144424 (2018)
Frustrated spin ladders show magnetization plateaux depending on the rung-exchange interaction and frustration defined by the ratio of first and second neighbor exchange interactions in each chain. This paper is the first report on its magnetic phase
Externí odkaz:
http://arxiv.org/abs/1707.04946
Autor:
Fujihala, M., Koorikawa, H., Mitsuda, S., Morita, K., Tohyama, T., Tomiyasu, K., Koda, A., Okabe, H., Itoh, S., Yokoo, T., Ibuka, S., Tadokoro, M., Itoh, M., Sagayama, H., Kumai, R., Murakami, Y., Nakamura, D.
Publikováno v:
Scientific Reports 7 (2017) 16785
K$_3$Cu$_3$AlO$_2$(SO$_4$)$_4$ is a highly one-dimensional spin-1/2 inequilateral diamond-chain antiferromagnet. Spinon continuum and spin-singlet dimer excitations are observed in the inelastic neutron scattering spectra, which is in excellent agree
Externí odkaz:
http://arxiv.org/abs/1705.01158
Autor:
Ishii, K., Tohyama, T., Asano, S., Sato, K., Fujita, M., Wakimoto, S., Tustsui, K., Sota, S., Miyawaki, J., Niwa, H., Harada, Y., Pelliciari, J., Huang, Y., Schmitt, T., Yamamoto, Y., Mizuki, J.
Publikováno v:
Phys. Rev. B 96, 115148 (2017)
We investigate electronic excitations in La2-x(Br,Sr)xCuO4 using resonant inelastic x-ray scattering (RIXS) at the oxygen K edge. RIXS spectra of the hole-doped cuprates show clear momentum dependence below 1 eV. The spectral weight exhibits positive
Externí odkaz:
http://arxiv.org/abs/1703.01018
Autor:
Kondo, Takeshi, Malaeb, W., Ishida, Y., Sasagawa, T., Sakamoto, H., Takeuchi, Tsunehiro, Tohyama, T., Shin, S.
Publikováno v:
Nature Communications 6, 7699 (2015)
In contrast to a complex feature of antinodal state, suffering from competing order(s), the "pure" pairing gap of cuprates is obtained in the nodal region, which therefore holds the key to the superconducting mechanism. One of the biggest question is
Externí odkaz:
http://arxiv.org/abs/1507.04312
In contrast to a complex feature of antinodal state, suffering from competing order(s), the "pure" pairing gap of cuprates is detected in the nodal region, which therefore holds the key to the superconducting mechanism. The pairing gap has been viewe
Externí odkaz:
http://arxiv.org/abs/1404.0911
Autor:
Ishii, K., Fujita, M., Sasaki, T., Minola, M., Dellea, G., Mazzoli, C., Kummer, K., Ghiringhelli, G., Braicovich, L., Tohyama, T., Tsutsumi, K., Sato, K., Kajimoto, R., Ikeuchi, K., Yamada, K., Yoshida, M., Kurooka, M., Mizuki, J.
The evolution of electronic (spin and charge) excitations upon carrier doping is an extremely important issue in superconducting layered cuprates and the knowledge of its asymmetry between electron- and hole-dopings is still fragmentary. Here we comb
Externí odkaz:
http://arxiv.org/abs/1403.0283