The physics of quantum materials is dictated by many-body interactions and mathematical
concepts such as symmetry and topology that have transformed our understanding of matter …

The charge density wave (CDW) instability, usually occurring in low-dimensional metals, has
been a topic of interest for longtime. However, some very fundamental aspects of the …

Metallic materials with kagome lattice structure are interesting because their electronic
structures can host flat bands, Dirac cones, and van Hove singularities, resulting in strong …

The kagome lattice provides a fertile platform to explore novel symmetry-breaking states.
Charge-density wave (CDW) instabilities have been recently discovered in a new kagome …

Symmetry plays a key role in determining the physical properties of materials. By Neumann's
principle, the properties of a material remain invariant under the symmetry operations of the …

The interaction of many-body systems with intense light pulses may lead to novel emergent
phenomena far from equilibrium. Recent discoveries, such as the optical enhancement of …

Engineering novel states of matter with light is at the forefront of materials research. An
intensely studied direction is to realize broken-symmetry phases that are “hidden” under …

This chapter reviews nonresonant, meV-resolution inelastic x-ray scattering (IXS), as applied
to the measurement of atomic dynamics of crystalline materials. It, in conjunction with a …

The Holstein model describes the interaction between fermions and a collection of local
(dispersionless) phonon modes. In the dilute limit, the phonon degrees of freedom dress the …

Non-equilibrium conditions may lead to novel properties of materials with broken symmetry
ground states not accessible in equilibrium as vividly demonstrated by non-linearly driven …