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Identification of Defects and the Origins of Surface Noise on Hydrogen–Terminated (100) Diamond

journal contribution
posted on 2025-01-08, 23:25 authored by YY Sung, L Oberg, R Griffin, AK Schenk, H Chandler, Santiago Corujeira GalloSantiago Corujeira Gallo, A Stacey, T Sergeieva, MW Doherty, C Weber, CI Pakes
AbstractNear‐surface nitrogen vacancy centres are critical to many diamond‐based quantum technologies such as information processors and nanosensors. Surface defects play an important role in the design and performance of these devices. The targeted creation of defects is central to proposed bottom‐up approaches to nanofabrication of quantum diamond processors, and uncontrolled surface defects may generate noise and charge trapping which degrade shallow NV device performance. Surface preparation protocols may be able to control the production of desired defects and eliminate unwanted defects, but only if their atomic structure can first be conclusively identified. This work uses a combination of scanning tunnelling microscopy (STM) imaging and first‐principles simulations to identify several surface defects on H:C(100)—2 × 1 surfaces prepared using chemical vapour deposition (CVD). The atomic structure of these defects is elucidated, from which the microscopic origins of magnetic noise and charge trapping are determined based on the modeling of their paramagnetic properties and acceptor states. Rudimentary control of these deleterious properties is demonstrated through STM tip‐induced manipulation of the defect structure. Furthermore, the results validate accepted models for CVD diamond growth by identifying key adsorbates responsible for the nucleation of new layers.

History

Journal

Advanced Materials Interfaces

Pagination

1-9

Location

London, Eng.

ISSN

2196-7350

eISSN

2196-7350

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Publisher

Wiley

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