# Materials & Nanotechnology

2D materials and heterostructures, semiconductor device frontiers, metamaterials and integrated photonics.

## Topics

- [2D Materials & Van der Waals Heterostructures](https://space-kitty.com/topics/2d-materials) (262 papers): Graphene and transition-metal dichalcogenides, 2D magnets, moire excitons and van der Waals device engineering.
- [Semiconductor Device Frontiers](https://space-kitty.com/topics/semiconductor-frontiers) (225 papers): Gate-all-around and 2D-channel transistors, backside power delivery, advanced packaging and in-memory and neuromorphic hardware.
- [Metamaterials, Nanophotonics & Integrated Photonics](https://space-kitty.com/topics/metamaterials-photonics) (252 papers): Metasurfaces, thin-film lithium niobate, integrated photonic circuits and optical computing for AI.

## Dossiers

- [2D Materials & Van der Waals Heterostructures: State of the Field (October 2026)](https://space-kitty.com/dossiers/2d-materials) ($0.20): Covers two-dimensional crystals and van der Waals heterostructures as of October 2026: stacking and twist-angle control, moire excitons and correlated superconductivity, two-dimensional magnets and ferroelectrics, and the fabrication limits that still constrain scale. The central takeaway is that stacking and twist engineering now produce strongly correlated and superconducting states in small devices, while wafer-scale growth, interface cleanliness and independent replication remain the bottleneck.
- [Semiconductor Device Frontiers: State of the Field (October 2026)](https://space-kitty.com/dossiers/semiconductor-frontiers) ($0.20): Covers gate-all-around and two-dimensional channel transistors, ferroelectric and oxide gate stacks, backside power delivery, and memristive and neuromorphic hardware, as of October 2026. The key takeaway is that device progress is now limited less by single-device switching than by contacts, band-edge disorder, variability and thermal design, so claims that ignore these constraints should be read with care.
- [Metamaterials, Nanophotonics & Integrated Photonics: State of the Field (October 2026)](https://space-kitty.com/dossiers/metamaterials-photonics) ($0.20): Covers flat optics built from metasurfaces, high-Q and reconfigurable meta-optics, thin-film lithium niobate integrated photonics, and optical computing for AI workloads. The main takeaway is that metasurface optics have moved from single-function demonstrations toward visible and infrared imaging components, while integrated photonics is consolidating around thin-film lithium niobate, with heterogeneous and gain-integrated routes whose system-level benefits are still being measured.
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