(Top-right) Side by side view of AFM characterization of the overgrown surface. (left) membrane bottom surface with etched down surface, (right) membrane top surface. Both surfaces show ~ 0.3 nm Rq roughness.
(Bottom-left) PL map of an ¹⁵N delta-doped diamond membrane highlighting delta-doped ¹⁵NV (teal circles) and naturally occurring ¹⁴NV (white circles). Membrane is 2nm thick ~30ppb ¹⁵N δ-doped layer with <1 ppb background ¹⁴N.
(Bottom-right) PL map of implantation created GeV⁻ centers in the diamond membrane from a 10⁸ cm⁻² implantation dose.
Scientific Achievement
Synthesis of high-quality tunable diamond membranes as a defect qubit host, serving as a hybrid materials platform for QIS applications.
Significance and Impact
Versatile diamond materials platform that can be integrated with nanophotonic and microelectronics devices.
Research Details
- Development of a full-stack approach for synthesizing diamond membranes while maintaining reliable material properties and integrating usable defect-based qubits.
- Generate isotopically (12C) purified diamond membranes with tunable thicknesses, bilaterally atomically flat surfaces (Rq ≤ 0.3nm), great uniformity over 200 x 200 µm scales, and bulk-like crystallinity.
- Demonstrated high quality germanium-vacancy (GeV–) centers at 5.4 K with narrow optical linewidths (125 MHz) and nitrogen-vacancy (NV–) centers at room temperature with T2* > 100 µs.
- Demonstrated this materials platform is compatible with both in-situ doping and implantation based defect creation processes.
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