249 citations
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- Waseda UniversityJP21 papers
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21 papers · 1 filter
Effects of disorder on lattice Ginzburg-Landau model of d-wave superconductors and superfluids
Tomonori Shimizu, Shunsuke Doi, Ikuo Ichinose +1
We study the effects of quenched disorder on the two-dimensional d-wave superconductors (SC's) at zero temperature by Monte-Carlo simulations. The model is defined on the three-dim…
Microlocal study of Lefschetz fixed point formulas for higher-dimensional fixed point sets
Yutaka Matsui, Kiyoshi Takeuchi
We introduce new Lagrangian cycles which encode local contributions of Lefschetz numbers of constructible sheaves into geometric objects. We study their functorial properties and a…
Vortex sheet in rotating two-component Bose-Einstein condensates
Kenichi Kasamatsu, Makoto Tsubota
We investigate vortex states of immiscible two-component Bose-Einstein condensates under rotation through numerical simulations of the coupled Gross-Pitaevskii equations. For stron…
Magnetic order, Bose-Einstein condensation, and superfluidity in a bosonic t-J model of CP^1 spinons and doped Higgs holons
Koji Aoki, Kazuhiko Sakakibara, Ikuo Ichinose +1
We study the three-dimensional U(1) lattice gauge theory of a CP spinon (Schwinger boson) field and a Higgs field. It is a bosonic - model in slave-particle representatio…
Implementation of holonomic quantum gates by an isospectral deformation of an Ising dimer chain
Yukihiro Ota, Masamitsu Bando, Yasusi Kondo +1
We exactly construct one- and two-qubit holonomic quantum gates in terms of isospectral deformations of an Ising model Hamiltonian. A single logical qubit is constructed out of two…
Milnor fibers over singular toric varieties and nearby cycle sheaves
Yutaka Matsui, Kiyoshi Takeuchi
We propose a new sheaf-theoretical method for the calculation of the monodromy zeta functions of Milnor fibrations. As an application, classical formulas of Kushnirenko and Varchen…