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Mirror skin effect and its electric circuit simulation

We analyze impacts of crystalline symmetry on the non-Hermitian skin effects. Focusing on mirror symmetry, we propose a novel type of skin effects, a mirror skin effect, which results in significant…
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Flat band quantum scar

We show that a quantum scar state, an atypical eigenstate breaking eigenstate thermalization hypothesis embedded in a many-body energy spectrum, can be constructed in flat band systems. The key idea…
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Square-root higher-order topological insulator on a decorated honeycomb lattice

Square-root topological insulators are recently proposed intriguing topological insulators, where the topologically nontrivial nature of Bloch wave functions is inherited from the square of the…
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Clustering of Topological Charges in a Kagome Classical Spin Liquid.

It is found that the recombination of topological charges gives rise to a yet unexplored classical spin liquid, characterized by an extensive residual entropy, as well as the formation of hexamers of same-sign topologicalCharges.
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Square-root topological semimetals

We propose topological semimetals generated by the square-root operation for tight-binding models in two and three dimensions, which we call square-root topological semimetals. The square-root…
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Detecting Bulk Topology of Quadrupolar Phase from Quench Dynamics.

It is elucidated that the quantity introduced indeed serves as an indicator of topological character for both noninteracting and interacting cases, and the robustness against disorders is also demonstrated.
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Oriented propagation of magnetization due to chiral edge modes in Kitaev-type models

Detecting chiral edge modes in topological materials has been intensively pursued in experiments. However, the phenomena caused by the modes are not yet elucidated theoretically. We study the…
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Controlling spin Hall effect by using a band anticrossing and nonmagnetic impurity scattering

The spin Hall effect (SHE) is one of the promising phenomena to utilize a spin current as spintronics devices, and the theoretical understanding of its microscopic mechanism is essential to know how…
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Phase diagram of a disordered higher-order topological insulator: A machine learning study

A higher-order topological insulator is a new concept of topological states of matter, which is characterized by the emergent boundary states whose dimensionality is lower by more than two compared…
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Higher-order topological phases in a spring-mass model on a breathing kagome lattice

We propose a realization of higher-order topological phases in a spring-mass model with a breathing kagome structure. To demonstrate the existence of the higher-order topological phases, we…
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