Electrical tuning of optically active interlayer excitons in bilayer MoS.

Interlayer (IL) excitons, comprising electrons and holes residing in different layers of van der Waals bonded two-dimensional semiconductors, have opened new opportunities for room-temperature excitonic devices. So far, two-dimensional IL excitons have been realized in heterobilayers with type-II band alignment. However, the small oscillator strength of the resulting IL excitons and difficulties with producing heterostructures with definite crystal orientation over large areas have challenged the practical applicability of this design.

Laser-writable high-k dielectric for van der Waals nanoelectronics.

Similar to silicon-based semiconductor devices, van der Waals heterostructures require integration with high- oxides. Here, we demonstrate a method to embed and pattern a multifunctional few-nanometer-thick high- oxide within various van der Waals devices without degrading the properties of the neighboring two-dimensional materials. This transformation allows for the creation of several fundamental nanoelectronic and optoelectronic devices, including flexible Schottky barrier field-effect transistors, dual-gated graphene transistors, and vertical light-emitting/detecting tunneling transistors.

Airway and lung parenchyma morphology during the respiratory cycle.

Objective: Describe the morphological changes that take place in the lung parenchyma and in the airways during the respiratory cycle with a view to establishing a relationship between them.

Subjects: Adult Wistar rats.

Interventions: The lungs were fixed at seven different points in the respiratory cycle: Inflation, 10 and 20 cm.

Lung hysteresis: a morphological view.

The lung is an imperfect elastic body and for this reason dissipates energy. The energy applied to the lung in inspiration is not recovered in expiration. The property of dissipating energy receives the name of hysteresis.