Abstract
As electronic devices near quantum limits and AI computational demands escalate, innovative solutions like photonics are crucial. Hyperbolic shear polaritons, known for their directional confinement and ultralow loss, present a promising approach to controlling asymmetric light propagation at the nanoscale. However, their realization is hindered by symmetry-related challenges in conventional systems. This project proposes a multiscale framework to develop tunable, low-loss hyperbolic shear polaritons using anisotropic two-dimensional (2D) materials or van der Waals (vdW) heterostructures twisted relative to anisotropic substrates. By introducing competing anisotropies, we aim to overcome current polaritonic limitations. We will employ many-body Green's function theory in the GW approximation and Bethe-Salpeter equation (BSE) methods to study hybrid polaritons and anisotropic dielectric responses in single layers. Subsequently, we will design the anisotropic anisotropic vdW heterostructures to achieve tunable hybrid polaritons and anisotropic dielectric response via quantum electrostatics. Finally, we will integrate these findings in the twisted photonic heterostructures to develop nanophotonic devices based on hyperbolic shear polaritons. This research addresses key challenges in shear polariton physics by transitioning from bulk phonon systems and metasurfaces to low-dimensional materials. The outcomes offer research promise to advance polariton-based photonic technologies.
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