Speaker
Description
Nitrogen-vacancy (NV) centers in diamond enable a variety of sensing applications ranging from measuring basic properties, such as temperature, pressure, strain, and external fields, down to detecting single cells, single molecules, or even single nuclear spins. Here, we present new opportunities for quantum sensing with shallow NV centers, i.e. located within 10 nm from the surface. First, we show that the presence of an adsorbed water layer improves the stability of negative charge state of NV [1]. This allows for quantum sensing at ultra-low temperature. Second, we demonstrate the possibility of manipulating the coherence time of shallow NV centers by controlling electric noses via interfacial band bending. This property enables sensing diamagnetic electrolytes from a solution on top of diamond surface [2]. Finally, we also discuss a new approach to accurately resolve the hyperfine structure based on the measurements of dephasing time (T2*).
[1] JN Neethirajan, T Hache, D Paone, D Pinto, A Denisenko, R Stöhr, P Udvarhelyi, A Pershin, A Gali, J Wrachtrup, K Kern, and A Singha. Nano Lett. 2023, 23, 7, 2563–2569
[2] FA Freire-Moschovitis, R Rizzato, A Pershin, MR Schepp, RD Allert, LM Todenhagen, MS Brandt, A Gali, and DB Bucher. ACS Nano 2023
