Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic Resonance Imaging of Single Atoms   Magnetic resonance imaging (MRI) revolutionized diagnostic medicine and
biomedical research by allowing a noninvasive access to spin ensembles. To
enhance MRI resolution to the nanometer scale, new approaches including
scanning probe methods have been used in recent years, which culminated in
detection of individual spins. This allowed three-dimensional (3D)
visualization of organic samples and of sophisticated spin-structures. Here, we
demonstrate for the first time MRI of individual atoms on a surface. The setup,
implemented in a cryogenic scanning tunneling microscope (STM), uses
single-atom electron spin resonance (ESR) to achieve sub-{\AA}ngstr\"om
resolution exceeding the spatial resolution of previous experiments by one to
two orders of magnitude. We find that MRI scans of different atomic species and
probe tips lead to unique signatures in the resonance images. These signatures
reveal the magnetic interactions between the tip and the atom, in particular
magnetic dipolar and exchange interaction.

7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom