About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
2D Materials – Preparation, Properties, Modeling & Applications
|
| Presentation Title |
Probing Johnson Noise with Shallow Spin Defects in 2D hBN |
| Author(s) |
Ryan Youngjae Manley, Yueh-Chun Wu, Simon Kim, Ian Gallagher, Sujoy Ghosh, Benjamin Lawrie |
| On-Site Speaker (Planned) |
Ryan Youngjae Manley |
| Abstract Scope |
Shallow quantum spin defects in two-dimensional materials offer a powerful platform for nanoscale probing of local noise environments. Surface plasmons on gold waveguide enhance VB⁻ photoluminescence, motivating their use for improved readout; however, they also introduce decoherence through electromagnetic noise. In this work, we engineer stable near-surface VB⁻ centers in mechanically exfoliated hexagonal boron nitride (hBN) via optimized low-energy (~1 keV) helium ion implantation, selecting a dose that minimizes spin–spin decoherence. With defect conditions fixed, we vary hBN thickness to control the separation distance between VB⁻ centers and gold waveguide substrates. Using T₁ relaxometry on these engineered samples, we investigate how Johnson noise varies with metal-distance, implantation parameters, and temperature. Our results provide a quantitative benchmark for often ignored Johnson noise at metal–dielectric interfaces with nanoscale spatial resolution, and we offer a scalable method to identify decoherence mechanisms in VB⁻ centers, advancing quantum sensors for two-dimensional quantum technologies. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Electronic Materials, Thin Films and Interfaces, Other |