Zobrazeno 1 - 10
of 74
pro vyhledávání: '"Shimahara, Hiroshi"'
Autor:
Kono, Yuki, Shimahara, Hiroshi
Publikováno v:
J. Phys. Soc. Jpn. Vol.90, 124711 (2021) [8 pages]
We examine magnetic structures of electron systems on an extended triangular lattice that consists of two types of bond triangles with electron transfer energies t_l and t'_l (l = 1, 2, and 3), respectively. We examine the ground state in the mean-fi
Externí odkaz:
http://arxiv.org/abs/2111.02696
Autor:
Shimahara, Hiroshi
Publikováno v:
J. Phys. Soc. Jpn. 90, 064711 (2021)
We examine the stability of mixed-symmetry superconducting states with broken time-reversal symmetry in spatial-symmetry-broken systems, including chiral states, on the basis of the free-energy functional derived in the weak-coupling theory. We consi
Externí odkaz:
http://arxiv.org/abs/2104.07325
Autor:
Shimahara, Hiroshi
Publikováno v:
J. Phys. Soc. Jpn. Vol.90, 044706 (2021)
We examine the Fermi-surface effect called the nesting effect for the FFLO state in strongly Pauli-limited Q2D superconductors, focusing on the effect of 3D factors, such as interlayer electron transfer, interlayer pairing, and off-plane magnetic fie
Externí odkaz:
http://arxiv.org/abs/2012.02403
Autor:
Shimahara, Hiroshi
Publikováno v:
J. Phys. Soc. Jpn. Vol.89, 093704 (2020)
We examine quasi-two-dimensional superconductors near half-filling under uniaxial pressures perpendicular to conductive layers (hereafter called perpendicular pressures). It is a natural conjecture that the perpendicular pressure decreases Tc because
Externí odkaz:
http://arxiv.org/abs/2006.09784
Autor:
Itahashi, Katsumi, Shimahara, Hiroshi
Publikováno v:
J. Phys. Soc. Jpn. Vol.87, 083701 (2018)
The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state in quasi-one-dimensional systems with warped Fermi surfaces is examined in strong parallel magnetic fields. It is shown that the state is extremely stable for field directions around nontrivial optimu
Externí odkaz:
http://arxiv.org/abs/1807.02937
Autor:
Shimahara, Hiroshi
Publikováno v:
J. Phys. Soc. Jpn. Vol.83, 044713 (2014)
The spin susceptibility of noncentrosymmetric superconductors is studied when the gap function has line nodes. As examples, d-wave states, where the gap function has an additional odd-parity phase factor, are examined. The curve of the spin susceptib
Externí odkaz:
http://arxiv.org/abs/1406.2763
Autor:
Miyawaki, Nobumi, Shimahara, Hiroshi
Publikováno v:
J. Phys. Soc. Jpn. Vol.83, 024703 (2014)
The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is examined in quasi-one-dimensional s-wave and d-wave superconductors with particular attention paid to the effect of the Fermi-surface anisotropy. The upper critical field $H_{c2}(T)$ is found to ex
Externí odkaz:
http://arxiv.org/abs/1402.0616
Autor:
Shimahara, Hiroshi
Noncentrosymmetric superconductors with various types of pairing interactions are systematically examined with particular focus on phenomena that originate from the differences between Fermi surfaces split by a strong spin-orbit coupling. In particul
Externí odkaz:
http://arxiv.org/abs/1209.3367
Autor:
Shimahara, Hiroshi
We examine the coexistence of the vortex state and the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state in quasi-two-dimensional type-II superconductors and the crossover from the coexistence state to the pure FFLO state when the Maki parameter \alpha i
Externí odkaz:
http://arxiv.org/abs/0903.3454
Autor:
Suginishi, Yuuichi, Shimahara, Hiroshi
Publikováno v:
Phys. Rev. B 74, 024518 (2006)
We derive critical field H_c2 equations for antiferromagnetic \textit{s}-wave, d_{x^2-y^2}-wave, and d_{xy}-wave superconductors with effective mass anisotropy in three dimensions, where we take into account (i) the Jaccarino-Peter mechanism of magne
Externí odkaz:
http://arxiv.org/abs/cond-mat/0603068