Axions are hypothetical particles that were proposed to solve the strong charge–parity
problem in high-energy physics. Although they have long been known in quantum field …

Introducing magnetism into topological insulators breaks time-reversal symmetry, and the
magnetic exchange interaction can open a gap in the otherwise gapless topological surface …

One of the intriguing properties characteristic to three-dimensional topological materials is
the topological magnetoelectric phenomena arising from a topological term called the θ …

The emergence of intrinsic quantum anomalous Hall (QAH) insulators with a long-range
ferromagnetic (FM) order triggers unprecedented prosperity for combining topology and …

Axion, first postulated as a hypothetical particle in high-energy physics, is now extended to
describe a novel topological magnetoelectric effect derived from the Chern–Simons theory …

The dynamical axion field is a new state of quantum matter where the magnetoelectric
response couples strongly to its low-energy magnetic fluctuations. It is fundamentally …

Floquet engineering is an important way to manipulate the electronic states of condensed
matter physics. Recently, the discovery of the magnetic topological insulator MnBi 2 Te 4 …

Intrinsic antiferromagnetic Mn 2 Bi 2 Te 5 crystals, a candidate of dynamical axion insulator
proposed theoretically recently, were successfully grown by the self-flux method. The crystal …

Ferroelectric control of two-dimensional magnetism is promising in fabricating electronic
devices with high speed and low-energy consumption. The newly discovered layered MnBi …

We theoretically investigate the elliptical high-order harmonic generation from the H 2+
molecule driven by the orthogonally polarized two-color laser field by numerically solving …