Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic sensing at zero field with a single nitrogen-vacancy center   Single nitrogen-vacancy (NV) centers are widely used as nanoscale sensors for
magnetic and electric fields, strain and temperature. Nanoscale magnetometry
using NV centers allows for example to quantitatively measure local magnetic
fields produced by vortices in superconductors, topological spin textures such
as skyrmions, as well as to detect nuclear magnetic resonance signals. However
one drawback when used as magnetic field sensor has been that an external bias
field is required to perform magnetometry with NV centers. In this work we
demonstrate a technique which allows access to a regime where no external bias
field is needed. This enables new applications in which this bias field might
disturb the system under investigation. Furthermore, we show that our technique
is sensitive enough to detect spins outside of the diamond which enables
nanoscale zero- to ultralow-field nuclear magnetic resonance.

15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys