Wey semimetal is an interesting class of topological materials that harbors chiral fermions as the low energy excitations. In this talk, I will give a comprehensive review of the Weyl semimetallic phase. Starting from exotic transport and experimental phenomena of such matter, I will discuss the dimensional hierarchy and the relation with the topological insulator phase in higher-dimensions....
Axion is one of the most compelling candidate particles for new physics beyond the Standard model. It is ubiquitous in a variety of well-motivated new physics scenarios and can address conundrums in the Standard Model, e.g., the strong CP problem. Indeed, research on axions is actively ongoing worldwide. In this talk, I will briefly overview axion physics and the current status of...
Experimental techniques to reveal the topology of materials and related properties are limited. Angle-resolved photoemission spectroscopy (ARPES) is a direct way to probe the band structure, but it cannot detect novel transport phenomena in a topological material. Electrical and thermal characterization techniques are therefore useful and necessary. In this talk, I will review experimental...
The axion is a hypothetical particle motivated from the Peccei-Quinn solution to the strong CP problem. Light axions, particularly those with masses below meV, exhibit feeble interactions with the standard model particles, rendering them compelling candidates for cold dark matter. Despite their flimsy interactions, numerous innovative methodologies have been proposed and implemented to...
We show that dark matter axions or axion-like particles (ALP) induce spontaneously alternating electric currents in conductors along the external magnetic fields due to the (medium) axial anomaly, realizing the chiral magnetic effects. We propose a new experiment to measure this current to detect the dark matter axions or ALP. These induced currents are the electron medium effects, directly...
Discussions on axions and Weyl metal
- Introduction of topological classification of electronic band structure based on historical perspectives: Paper reviews
2.Emergent axions in ferromagnetic Weyl metals, antiferromagnetic topological insulators, and superconducting Weyl metals: From microscopic lattice models to effective field theories with symmetry breaking ➔ Novel non-equilibrium phase transitions - Introduction of...
In this short review presentation, I would like to talk about the basic concept of time-resolved photoemission and angle-resolved photoemission spectroscopy as the fittest observation tool for Dirac/Weyl systems, and present a few prototypical successful examples in chronological order to observe Dirac/Weyl quasi-particles in condensed matter systems via TR-/ARPES, expecting vivid discussion...
In this talk, I will describe various generalized global symmetries of axion-Maxwell theory.
This includes 0-, 1-, and 2-form symmetries, non-invertible symmetries and 3-group symmetry. If time permits, I will briefly mention how the symmetry structure changes for axion-YM and axion-QCD theory.
We examine how to realize the Weyl Fermion in holography, which describe a strongly interacting system. We then study whether the topology of the Weyl Fermion realized in holographic set up to answer the question whether it remains in the presence of the interaction. Finally, we try to understand the topology as a consequence of the symmetry breaking.
