Tsukasa Tada

A Back Illuminated 10μm SPAD Pixel Array Comprising Full Trench Isolation and Cu-Cu Bonding with Over 14% PDE at 940nm

Ken Ito, Y. Otake, Yoshiaki Kitano, Atsushi Matsumoto et autres

A state of the art Back Illuminated (BI) Single Photon Avalanche Diode (SPAD) array sensor realized via a 90nm CMOS compatible process on a 300 mm silicon platform is reported in the following. The array consists of 10 μm pixels, each using …

Conformal quantum mechanics and sine-square deformation

Tsukasa Tada

We revisit conformal quantum mechanics (CQM) from the perspective of sine-square deformation (SSD) and the entanglement Hamiltonian. The operators related to SSD and the entanglement Hamiltonian are identified. Thus, the nature of SSD and the entanglement can be discussed in a much …

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Dipolar quantization and the infinite circumference limit of two-dimensional conformal field theories

Nobuyuki Ishibashi, Tsukasa Tada

Elaborating on our previous presentation, where the term dipolar quantization was introduced, we argue here that adopting [Formula: see text] as the Hamiltonian instead of [Formula: see text] yields an infinite circumference limit in two-dimensional conformal field theory. The new Hamiltonian leads …

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Infinite circumference limit of conformal field theory

Tsukasa Tada

journal article

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Sine-square deformation and its relevance to string theory

Tsukasa Tada

Sine-square deformation, a recently found modulation of the coupling strength in certain statistical models, is discussed in the context of two-dimensional (2D) conformal field theories (CFTs), with particular attention to open/closed string duality. This deformation is shown to be nontrivial and leads …

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Sine Square Deformation and String Theory

Tsukasa Tada

Figure 1: Open boundary condition Recently, a very intriguing observation was made regarding the boundary conditions of quantum systems [1]. Consider a system consists of N sites, each of which couples to two nearest sites with an equal strength, except at the …

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Development of a WDX-μ-PIXE system for chemical state mapping

Sho Toyama, Shigeo Matsuyama, K. Ishii, A. Terakawa et autres

In this paper, we have developed a wavelength dispersive X-ray spectrometer microparticle-induced X-ray emission (WDX-[Formula: see text]-PIXE) system combining a microbeam system with high spatial resolution and wavelength dispersive X-ray (WDX) spectrometry with high-energy resolution for chemical state mapping. A Von Hamos …

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Matrix Model Criticality and Resonant Tunneling

Tsukasa Tada

We suggest that the Hermitian matrix models with resonant tunneling may exhibit novel criticality. Some features of the proposed criticality are explored. In particular, we argue that the new critical point is connected with the first-order transition.

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IMPROVEMENT OF THE DETECTION EFFICIENCY OF THE IN-AIR SUBMILLI-PIXE CAMERA FOR BIOLOGICAL APPLICATIONS

H. Sugai, Kotoyo Fujiki, K. Ishii, Shigeo Matsuyama et autres

The detection efficiency of the submilli-PIXE camera was improved by installing a new X-ray detector with a smaller distance from specimens. The distortion of elemental images caused by position dependent detection efficiency was corrected by estimating the detection efficiency based on the …

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PIXE ANALYSIS OF DYES USED IN TRADITIONAL JAPANESE CARPETS (NABESHIMA-DANTSU)

Yoshinori Miura, Ikuko Hirai, K. Ishii, Shigeo Matsuyama et autres

NABESHIMA-DANTSU is the name of the first Japanese-made carpets which have been produced in the Nabeshima domain (Saga Prefecture) since the later Edo period. The NABESHIMA-DANTSU carpets have been woven from one kind of cotton, and have been dyed with various dyes …

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PIXE STUDY ON THE GROWTH ENVIRONMENT OF PLANTS

S. Hiraishi, K. Ishii, Shigeo Matsuyama, H. Sugai et autres

Growth environment of plants was investigated by analyzing the elemental concentration in leaves of the plants. Camellia was selected as the sample and the leaves of the camellias were collected from Miyagi and Chiba prefectures. The species of elements and their concentrations …

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Target Temperature Rise and Gas Emission during Chemical State Analysis by WD-PIXE Measurement

Tsukasa Tada, Hitoshi Fukuda, Jun Hasegawa, Yasufumi OGURI et autres

Preliminary measurements on target temperature rise and gas emission were conducted during a 2‐MeV proton irradiation to investigate the mechanism of the chemical state changes of phosphorus, sulfur, and chlorine during high‐resolution WD‐PIXE measurements. Sulfur and phosphorus targets were irradiated for approximately …

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