Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scars in Dirac fermion systems: the influence of an Aharonov--Bohm flux   Time-reversal ($\mathcal{T}$-) symmetry is fundamental to many physical
processes. Typically, $\mathcal{T}$-breaking for microscopic processes requires
the presence of magnetic field. However, for 2D massless Dirac billiards,
$\mathcal{T}$-symmetry is broken automatically by the mass confinement, leading
to chiral quantum scars. In this paper, we investigate the mechanism of
$\mathcal{T}$-breaking by analyzing the local current of the scarring
eigenstates and their magnetic response to an Aharonov--Bohm flux. Our results
unveil the complete understanding of the subtle $\mathcal{T}$-breaking
phenomena from both the semiclassical formula of chiral scars and the
microscopic current and spin reflection at the boundaries, leading to a
controlling scheme to change the chirality of the relativistic quantum scars.
Our findings not only have significant implications on the transport behavior
and spin textures of the relativistic pseudoparticles, but also add basic
knowledge to relativistic quantum chaos.

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The categories of this paper are: astro-ph
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: eess
34
The categories of this paper are: chem-ph
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The categories of this paper are: econ