The topological properties of an object, associated with an integer called the topological
invariant, are global features that cannot change continuously but only through abrupt …

The concept of topological energy bands and their manifestations have been demonstrated
in condensed matter systems as a fantastic paradigm toward unprecedented physical …

In solid state physics, a bandgap (BG) refers to a range of energies where no electronic
states can exist. This concept was extended to classical waves, spawning the entire fields of …

The advancement in electromagnetic metamaterials, which commenced three decades ago,
experienced a rapid transformation into acoustic and elastic systems in the forms of …

Piezoelectric energy harvesting has attracted tremendous interest for designing sustainable
self-powered devices/systems targeted to special environment such as wireless or wearable …

Modern technological advances allow for the study of systems with additional synthetic
dimensions. Higher-order topological insulators in topological states of matters have been …

Topological elastic metamaterials have emerged as a new frontier in the quest of topological
phases in condensed matter physics. Their exotic topological properties open a wealth of …

We experimentally achieve wave-mode conversion and rainbow trapping in an elastic
waveguide loaded with an array of resonators. Rainbow trapping is a phenomenon that …

We experimentally demonstrate temporal pumping of elastic waves in an electromechanical
waveguide. Temporal pumping exploits a virtual dimension mapped to time, enabling the …

High quality nanomechanical oscillators are promising platforms for quantum entanglement
and quantum technology with phonons. Realizing coherent transfer of phonons between …