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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 […]

Movie2024.9.27 Understanding NonInvertible 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 noninvertible symmetries which do not have inverse elements and cannot be […]

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 BardeenCooperSchrieffer (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 […]

Movie2024.8.15 General QuasiJoint Probabilities on FiniteState Quantum Systems
In quantum mechanics, quantum observables, like position, momentum, energy, and spin, are in general noncommutative, 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 […]