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Related Experiment Video

Updated: Jan 15, 2026

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A Suspended 4H-Silicon Carbide Membrane Platform for Defect Integration into Quantum Devices.

Amberly H Xie1, Aaron M Day1, Jonathan R Dietz2

  • 1John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.

Nano Letters
|October 15, 2025
PubMed
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Science advances·2026

Researchers developed a novel fabrication method for suspended 4H-silicon carbide (SiC) thin films, enabling advanced quantum devices. This technique overcomes previous limitations, paving the way for scalable quantum technology applications.

Area of Science:

  • Quantum Technology
  • Materials Science
  • Solid-State Physics

Background:

  • 4H-silicon carbide (SiC) is a key material for solid-state quantum technology due to its wide bandgap and spin-active color centers.
  • Integrating these color centers into suspended nanodevices is crucial for enhanced defect control and readout in quantum applications.
  • Existing fabrication methods for 4H-SiC thin films face challenges due to the material's stability, hindering quantum technology development.

Purpose of the Study:

  • To develop a new, robust fabrication approach for suspended 4H-SiC thin films.
  • To enable the creation of advanced quantum devices with integrated color centers.
  • To overcome the limitations of current fabrication processes for 4H-SiC.

Main Methods:

  • A novel fabrication technique was developed, starting with the synthesis of suspended thin films from a monolithic platform.
Keywords:
nanofabricationphotonic crystal cavitiespoint defectssilicon carbide

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  • Subsequent patterning of devices was performed on these suspended films.
  • Characterization of fabricated structures, including 1D photonic crystal cavities and lithium niobate on 4H-SiC acoustic cavities, was conducted.

    • Main Results:

    • Demonstrated a new fabrication approach for producing suspended 4H-SiC thin films.
    • Successfully fabricated and characterized 1D photonic crystal cavities and acoustic cavities compatible with defect integration.
    • The technique supports high-temperature annealing and heterogeneous material integration.

    Conclusions:

    • The developed fabrication method offers enhanced flexibility and scalability for 4H-SiC device production.
    • This approach provides a versatile platform for advancing solid-state quantum technologies.
    • The technique addresses key challenges in fabricating 4H-SiC for quantum applications, enabling future defect integration and device optimization.