Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectroscopic signatures of time-reversal symmetry breaking
  superconductivity   The collective mode spectrum of a symmetry-breaking state, such as a
superconductor, provides crucial insight into the nature of the order
parameter. In this context, we present a microscopic weak-coupling theory for
the collective modes of a generic multi-component time-reversal symmetry
breaking superconductor, and show that fluctuations in the relative amplitude
and phase of the two order parameter components are well-defined underdamped
collective modes, even in the presence of nodal quasiparticles. We then
demonstrate that these "generalized clapping modes" can be detected using a
number of experimental techniques including ac electronic compressibility
measurements, electron energy loss spectroscopy, microwave spectroscopy, and
ultrafast THz spectroscopy. Finally, we discuss the implications of our work as
a new form of "collective mode spectroscopy" that drastically expands the
number of experimental probes capable of detecting time-reversal symmetry
breaking in unconventional superconductors such as
Sr$_{\text{2}}$RuO$_{\text{4}}$, UTe$_{\text{2}}$, and moir\'e
heterostructures.

9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess