Interlayer Excitons

2D materials provide an excellent system for studying excitons, which are bound electron-hole pairs. Specifically, interlayer excitons form between stacked 2D layers, with the electron and hole residing in separate layers. These spatially separated quasiparticles exhibit highly intriguing physical properties.

Diverse Forms of Excitons

Interlayer excitons are not limited to simple dipolar configurations. Depending on the layer interactions, they can exist in a variety of complex and fascinating states. These include hybridized excitons, quadrupolar excitons, and symmetric excitons, offering a rich platform for novel optical physics.

Precise Control via Electric Fields

Due to the spatial separation of their charges, interlayer excitons possess a strong permanent dipole moment. Consequently, when an external electric field is applied, their energy levels and emission intensity can be precisely tuned and actively controlled through the Stark shift effect.

Application as Quantum Simulators

By utilizing this electric-field tunability alongside nanoscale patterned electrodes, we can trap and localize excitons within extremely small areas. This precise spatial control enables the creation of powerful solid-state quantum simulators designed to mimic and study complex condensed matter systems.

Exciton-Polariton Applications

Because interlayer excitons share a parallel orientation, they exhibit strong dipolar interactions with one another. This robust many-body interaction is highly valuable for exciton-polariton applications, enabling significant nonlinear optical phenomena for next-generation optoelectronic and quantum devices.