Structurally different from conventional oxide ferroelectrics with rigid lattices, van der Waals
(vdW) ferroelectrics have stable layered structures with a combination of strong intralayer …

Topology and Symmetry of Quantum Materials via Nonlinear Optical Responses | Annual
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Coexistence of reversible polar distortions and metallicity leading to a ferroelectric metal,
first suggested by Anderson and Blount in 1965, has so far remained elusive. Electrically …

This Perspective addresses the design, creation, characterization and control of synthetic
quantum materials with strong electronic correlations. We show how emerging synergies …

Device applications of ferroelectrics have not only utilized the switchable polarization but
also adopted myriads of emerging physical properties. In particular, ferroelectrics in ultra …

Electric-dipole optical second harmonic generation (SHG) is a second-order nonlinear
process that is widely used as a sensitive probe to detect broken inversion symmetry and …

We review the class of materials known as polar metals, in which polarity and metallicity
coexist in the same phase. While the notion of polar metals was first invoked more than 50 …

Polar metals are challenging to identify spectroscopically because the fingerprints of electric
polarization are often obscured by the presence of screening charges. Here, we unravel …

Polar metals have recently garnered increasing interest because of their promising
functionalities. Here we report the experimental realization of an intrinsic coexisting …

The possibility of reconciliation between seemingly mutually exclusive properties in one
system can not only lead to theoretical breakthroughs but also potential novel applications …