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- Kyoto UniversityJP32 papers
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6 papers · 1 filter
Self-Duality and Phase Structure of the 4D Random-Plaquette Z_2 Gauge Model
Gaku Arakawa, Ikuo Ichinose, Tetsuo Matsui +1
In the present paper, we shall study the 4-dimensional Z_2 lattice gauge model with a random gauge coupling; the random-plaquette gauge model(RPGM). The random gauge coupling at ea…
Spontaneous Symmetry Breakings in Gauge Theories for Doped Quantum Dimer and Eight-Vertex Models
Ikuo Ichinose, Daisuke Yoshioka
Behavior of doped fermions in gauge theories for the quantum dimer and eight-vertex models is studied. Fermions carry charge and spin degrees of freedom. In the confinement p…
Ab-initio calculations of the Optical band-gap of TiO2 thin films
Wilfried Wunderlich, Lei Miao, Masaki Tanemura +6
Titanium dioxide has been extensively studied in recent decades for its important photocatalytic application in environmental purification. The search for a method to narrow the op…
Fabrication of nano-structured Titania - Thin-Films on Carbon-coated Nickel sheets
Wilfried Wunderlich, Nguyen Thi Hue, Sakae Tanemura
This research for Eco-materials focuses on the improvement of photo response of titania thin films. The goal of this research is to find a suitable substrate for decreasing the ban…
Néel-Dimer Transition in Antiferromagnetic Heisenberg Model and Deconfinement of Spinons at the Critical Point
Daisuke Yoshioka, Gaku Arakawa, Ikuo Ichinose +1
Quantum phase transition from the Néel to the dimer states in an antiferromagnetic(AF) Heisenberg model on square lattice is studied. We introduce a control parameter for the e…
Phase Structure of the Random-Plaquette Z_2 Gauge Model: Accuracy Threshold for a Toric Quantum Memory
Takuya Ohno, Gaku Arakawa, Ikuo Ichinose +1
We study the phase structure of the random-plaquette Z_2 lattice gauge model in three dimensions. In this model, the "gauge coupling" for each plaquette is a quenched random variab…