The purpose of this review is to survey the status of the theory and experiment which can
contribute to our knowledge of plasmon excitations in synthetic semiconductor …

The quantum Hall effect (QHE) provides an invariant reference for resistance linked to
natural constants. It is used worldwide to maintain and compare the unit of resistance. The …

Circulators are nonreciprocal circuit elements that are integral to technologies including
radar systems, microwave communication transceivers, and the readout of quantum …

In interacting one-dimensional (1D) systems, the quasi-particle picture in Fermi-liquid theory
cannot successfully describe low-energy physics. Instead, electron dynamics in one …

We report time-of-flight measurements on electrons traveling in quantum Hall edge states.
Hot-electron wave packets are emitted one per cycle into edge states formed along a …

Edge magnetoplasmon (EMP) transport in gated and ungated quantum Hall systems is
investigated by time-of-flight measurements. We measured the velocity, the amplitude, and …

We have investigated the time-resolved low-energy charge dynamics in counterpropagating
edge channels formed in the quantum Hall regime of an electron-hole bilayer system in …

We investigate resonant edge magnetoplasmons (EMPs) and their decay in graphene by
high-frequency electronic measurements. From EMP resonances in disk shaped graphene …

We observe a new type of magneto-oscillations in the photovoltage and the longitudinal
resistance of a two-dimensional electron system. The oscillations are induced by microwave …

Plasmons, which are collective charge oscillations, could provide a means of confining
electromagnetic field to nanoscale structures. Recently, plasmonics using graphene have …