585 citations · 1.1k across the 46 of their papers we have counts for
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Decay of Superconducting Correlations for Gauged Electrons in Dimensions
Yasuhiro Tada, Tohru Koma
We study lattice superconductors coupled to gauge fields, such as an attractive Hubbard model in electromagnetic fields, with a standard gauge fixing. We prove upper bounds for a t…
The Noncommutative Index Theorem and the Periodic Table for Disordered Topological Insulators and Superconductors
Hosho Katsura, Tohru Koma
We study a wide class of topological free-fermion systems on a hypercubic lattice in spatial dimensions . When the Fermi level lies in a spectral gap or a mobility gap, the…
Two No-Go Theorems on Superconductivity
Yasuhiro Tada, Tohru Koma
We study lattice superconductors such as attractive Hubbard models. As is well known, Bloch's theorem asserts absence of persistent current in ground states and equilibrium states…
Improving the Lieb-Robinson bound for long-range interactions
T. Matsuta, T. Koma, S. Nakamura
We improve the Lieb-Robinson bound for a wide class of quantum many-body systems with long-range interactions decaying by power law. As an application, we show that the group veloc…