Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of Coexistence of Yu-Shiba-Rusinov States and Spin-Flip
  Excitations   We investigate the spectral evolution in different metal phthalocyanine
molecules on NbSe$_2$ surface using scanning tunnelling microscopy (STM) as a
function of the coupling with the substrate. For manganese phthalocyanine
(MnPc), we demonstrate a smooth spectral crossover from Yu-Shiba-Rusinov (YSR)
bound states to spin-flip excitations. This has not been observed previously
and it is in contrast to simple theoretical expectations. We corroborate the
experimental findings using numerical renormalization group calculations. Our
results provide fundamental new insight on the behavior of atomic scale
magnetic/SC hybrid systems, which is important for e.g. engineered topological
superconductors and spin logic devices.

18
The categories of this paper are: econ
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol