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Movie2025.1.21 Shaping the Future of Materials Science with Tanabe–Sugano Diagrams
The Tanabe–Sugano diagrams, developed by Yukito Tanabe and Satoru Sugano in 1954, show how the energy levels of electrons in the d-orbitals split under the influence of a ligand field. These diagrams help reveal the details about optical responses, magnetic properties, and electronic behaviors of transition-metal complexes and compounds. Commemorating 70 years of the Tanabe–Sugano […]
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Movie2025.1.6 Unlocking Secrets of Novel Charge-Orbital States in Transition-Metal Compounds
One of the intriguing phenomena in the field of condensed matter physics is the charge density wave or CDW. It is a periodic modulation of electronic charge and atomic positions in materials, similar to the formation of intricate patterns, like waves. This state is typically induced by the Peierls mechanism, driven by Fermi surface nesting that […]
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Movie2024.11.12 Revival of JRR-3: A New Frontier in Neutron Scattering Research
The 2011 Great East Japan Earthquake damaged the Japan Research Reactor 3 (JRR-3), owned by the Japan Atomic Energy Agency, leading to its shutdown. Thanks to the extraordinary efforts of many people, after nearly 10 years, in February 2021, the reactor resumed operation after meeting all the strict safety standards. Since then, users who had […]
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Movie2024.10.1 A New Method for Finding Bound States in the Continuum
The bound state at positive energy or the bound state in the continuum (BIC) was first predicted by von Neumann and Wigner in 1929. Unlike conventional bound states, which can only exist at discrete negative energies below continuum spectra of scattering states with positive energies, BICs make use of nonlocality of potential to confine themselves […]
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Movie2024.9.27 Understanding Non-Invertible Symmetries in Higher Dimensions Using Topological Defects
Symmetry is a fundamental concept of physics that describes how the laws of physics remain unchanged under certain transformations. Generalized symmetries are an extension of this concept, which, in recent times, has been applied to the analysis of quantum field theories. Among these are non-invertible symmetries which do not have inverse elements and cannot be […]
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Movie2024.8.22 The Mysterious Superconductivity of Sr2RuO4
The study of unconventional superconductivity is central to modern condensed matter physics research. Unconventional superconductors are materials that exhibit superconductivity through mechanisms that are not explained by the conventional Bardeen-Cooper-Schrieffer (BCS) theory. Since its discovery in 1994, studies on the superconductivity of strontium ruthenate (Sr2RuO4), a layered perovskite, have established it as a strongly correlated […]
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Movie2024.8.15 General Quasi-Joint Probabilities on Finite-State Quantum Systems
In quantum mechanics, quantum observables, like position, momentum, energy, and spin, are in general non-commutative, meaning that their measurement order may affect the outcome. As a result, it is generally impossible to measure them simultaneously. Consequently, their joint probability distributions cannot be defined, limiting a complete understanding of quantum systems. There have been many attempts […]