496 citations · 2k across the 70 of their papers we have counts for
17 papers · 1 filter
Quantized spin Hall effect in Helium three-A and other p-wave paired Fermi systems
Jun Goryo, Mahito Kohmoto, Yong-Shi Wu
In this paper we propose the quantized spin Hall effect (SHE) in the vortex state of a rotating p-wave paired Fermi system in an inhomogeneous magnetic field and in a weak periodic…
Superconductivity and Abelian Chiral Anomalies
Y. Hatsugai, S. Ryu, M. Kohmoto
Motivated by the geometric character of spin Hall conductance, the topological invariants of generic superconductivity are discussed based on the Bogoliuvov-de Gennes equation on l…
On Berry Phase in Bloch States
Jun Goryo, Mahito Kohmoto
We comment on the relation between Berry phase and quantized Hall conductivities for charge and spin currents in some Bloch states, such as Bloch electrons in the presence of elect…
Berry phase and spin quantum Hall effect in the vortex state of superfluid He3 in two dimensions
Jun Goryo, Mahito Kohmoto
We show that the spin quantum Hall effect in the vortex state of two-dimensional rotating superfluid He3 can be described as an adiabatic spin transport of Bloch quasiparticles. We…
On the nature of antiferromagnetism in the CO_2 planes of oxide superconductors
J. Friedel, M. Kohmoto
Recent results on electrons and holes doped CuO 2 planes confirm the marked covalency of CuO bonding, suggesting a band picture of long and short range antiferromagnetism. The maxi…
Anisotropic superconductivity mediated by phonons in layered compounds with weak screening effect
Hiroshi Shimahara, Mahito Kohmoto
Anisotropic pairing interactions mediated by phonons are examined in layer systems. It is shown that the screening effects become weaker when the layer spacing increases. Then the…
Enhancement of superconductive critical temperatures in almost empty or full bands in two dimensions: possible relevance to beta-HfNCl, C60 and MgB2
Mahito Kohmoto, Iksoo Chang, Jacques Friedel
We examine possibility of enhancement of superconductive critical temperature in two-dimensions. The weak coupling BCS theory is applied, especially when the Fermi level is near th…
Triplet superconductivity induced by screened phonon interactions in ferromagnetic compounds
Hiroshi Shimahara, Mahito Kohmoto
We propose that screened pairing interactions mediated by phonons could give rise to a spin triplet superconductivity in ferromagnetic compounds such as UGe_2. It is pointed out th…
Unconventional odd-parity superconductivity in the ladder compounds
Mahito Kohmoto, Masatoshi Sato
Superconductive properties of the two-leg ladder compounds are studied theoretically. The antiferromagnetic fluctuations are considered because of the good nesting of the Fermi sur…
Mechanism of spin-triplet superconductivity in Sr2RuO4
Masatoshi Sato, Mahito Kohmoto
The unique Fermi surfaces and their nesting properties of Sr2RuO4 are considered. The existence of unconventional superconductivity is shown microscopically, for the first time, fr…
High temperature superconductivity from the two-dimensional semiconductors without magnetism
Mahito Kohmoto, Iksoo Chang, Jacques Friedel
We examine the possibility of high temperature superconductivity from two-dimensional semiconductor without antiferromagnetic fluctuations. The weak coupling BCS theory is applied,…
Spin-triplet superconductivity in quasi-one dimension
Mahito Kohmoto, Masatoshi Sato
We consider a system with electron-phonon interaction, antiferromagnetic fluctuations and disconnected open Fermi surfaces. The existence of odd-parity superconductivity in this ci…
Pseudogap due to antiferromagnetic fluctuations and the phase diagram of the high temperature oxide superconductors
Hiroshi Shimahara, Yasumasa Hasegawa, Mahito Kohmoto
A reduction of the density of states near the Fermi energy in the normal state (pseudogap) of high-temperature oxide superconductors is examined on the basis of the two-dimensional…
Phase transition between d-wave and anisotropic s-wave gaps in high temperature oxides superconductors
Iksoo Chang, Jacques Friedel, Mahito Kohmoto
We study models for superconductivity with two interactions: due to antiferromagnetic(AF) fluctuations and due to phonons, in a weak coupling approach to the high tempe…
Anisotropy and magnetism of high temperature oxides superconductors
J. Friedel, M. Kohmoto
Phonon or electron mediated weak BCS attraction is enough to have high critical temperature if a van Hove anomaly is at work. This could apply to electron doped compounds and also…
Novel vortex lattice transition in d-wave superconductors
Jun'ichi Shiraishi, Mahito Kohmoto, Kazumi Maki
We study the vortex state in a magnetic field parallel to the axis in the framework of the extended Ginzburg Landau equation. We find the vortex acquires a fourfold modulation…
Low-lying excitations around a single vortex in a d-wave superconductor
Y. Morita, M. Kohmoto, K. Maki
A full quantum-mechanical treatment of the Bogoliubov-de Gennes equation for a single vortex in a d-wave superconductor is presented. First, we find low-energy states extended in f…