Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New opportunites for interactions and control with ultracold lanthanides   Lanthanide atoms have an unusual electron configuration, with a partially
filled shell of $f$ orbitals. This leads to a set of characteristic properties
that enable enhanced control over ultracold atoms and their interactions: large
numbers of optical transitions with widely varying wavelengths and transition
strengths, anisotropic interaction properties between atoms and with light, and
a large magnetic moment and spin space present in the ground state. These
features in turn enable applications ranging from narrow-line laser cooling and
spin manipulation to evaporative cooling through universal dipolar scattering,
to the observation of a rotonic dispersion relation, self-bound liquid-like
droplets stabilized by quantum fluctuations, and supersolid states. In this
short review, we describe how the unusual level structure of lanthanide atoms
leads to these key features, and provide a brief and necessarily partial
overview of experimental progress in this rapidly developing field.

15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th