In quantum materials, emergent functional properties resulting from strong correlations or
electronic topology offer opportunities for new applications. Over the past decade, ultrafast …

Nonlinear optical spectroscopies are powerful tools for investigating both static material
properties and light-induced dynamics. Terahertz (THz) emission spectroscopy has …

Ferroic orders describe spontaneous polarization of spin, charge and lattice degrees of
freedom in materials. Materials exhibiting multiple ferroic orders, known as multiferroics …

Twist engineering—the alignment of two-dimensional (2D) crystalline layers with a specific
orientation—has led to tremendous success in controlling the charge degree of freedom …

The formation of topological defects after a symmetry-breaking phase transition is an
overarching phenomenon that encodes the underlying dynamics. The Kibble–Zurek …

The spontaneous symmetry breakdown of matter is one of the most important concepts in
materials physics and leads to a phase transition into an ordered phase and domain …

Ferroaxial materials that exhibit spontaneous ordering of a rotational structural distortion
with an axial vector symmetry have gained growing interest, motivated by recent extensive …

The mechanism on ferroelectric phase transitions is mainly attributed to the displacive
and/or order-disorder transition of internal components since the discovery of the …

Unlike what happens in conventional ferroics, the ferrorotational (FR) domain manipulation
and visualization in FR materials are nontrivial as they are invariant under both space …

An electric ferro-axial moment, which is characterized by a nonzero expectation value of a
time-reversal-even axial vector, exhibits distinct spatial-inversion and time-reversal …