When the continuous symmetry of a physical system is spontaneously broken, two types of
collective modes typically emerge: the amplitude and the phase modes of the order …

The diagrammatic formalism and transport equation are conventionally considered as
separate but complementary basic techniques to tackle the impurity scattering effect. To …

We show that the Higgs mode of a superconductor, which is usually challenging to observe
by far-field optics, can be made clearly visible using near-field optics by harnessing …

A static electric field has always been thought to play little role in the physics of ideal
conductors, since the screening effects of mobile carriers prevent it from penetrating deep …

The Higgs mode associated with amplitude fluctuations of the superconducting gap in
uniform superconductors is usually heavy, which makes its excitation and detection difficult …

Symmetry plays an important role in the topological band theory to remedy the eigenstates'
gauge obstruction at the cost of a symmetry anomaly and zero-energy boundary modes …

By using the gauge-invariant kinetic equation [Yang and Wu, Phys. Rev. B 98, 094507
(2018) 2469-9950 10.1103/PhysRevB. 98.094507; Yang and Wu, Phys. Rev. B 100, 104513 …