Exciton–polaritons in van der Waals heterostructures embedded in tunable microcavities

Tunable phonon polaritons in atomically thin van der Waals crystals of boron nitride.

van der Waals heterostructures assembled from atomically thin crystalline layers of diverse two-dimensional solids are emerging as a new paradigm in the physics of materials. We used infrared nanoimaging to study the properties of surface phonon polaritons in a representative van der Waals crystal, hexagonal boron nitride. We launched, detected, and imaged the polaritonic waves in real space an...

Excitons in van der Waals heterostructures The important role of dielectric screening

Nonlinear Vibration Analysis of Embedded Multiwalled Carbon Nanotubes in Thermal Environment

In this article, based on the Euler-Bernoulli beam theory, the large-amplitude vibration of multiwalled carbon nanotubes embedded in an elastic medium is investigated. The method of incremental harmonic balance is implemented to solve the set of governing nonlinear equations coupled via the van der Waals (vdW) interlayer force. The influences of number of tube walls, the elastic medium, nanotub...

Exciton polaritons in single and coupled microcavities

Recent work on strong coupling exciton}polariton phenomena in single and coupled microcavities is presented. We describe experiments for single cavities where the strong coupling nature of the excitations manifests itself. It is also shown that coupled cavities enable optically induced coupling between macroscopically separated exciton states to be achieved, and polaritons with strongly anisotr...

Ultrafast charge transfer in atomically thin MoS₂/WS₂ heterostructures

Van der Waals heterostructures have recently emerged as a new class of materials, where quantum coupling between stacked atomically thin two-dimensional layers, including graphene, hexagonal-boron nitride and transition-metal dichalcogenides (MX2), give rise to fascinating new phenomena1–10. MX2 heterostructures are particularly exciting for novel optoelectronic and photovoltaic applications, b...