Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: PT phase transition in a (2+1)-d relativistic system   We study a massless Dirac particle with PT symmetric non-Hermitian Rashba
interaction in the background of Dirac oscillator potential to show the PT
phase transition in a (2+1) dimensional relativistic system analytically. PT
phase transition occurs when strength of the (i) imaginary Rashba interaction
or (ii) transverse magnetic field exceed their respective critical values.
Small mass gap in the spectrum, consistent with other approaches is generated
as long as the system is in the unbroken phase. Relativistic Landau levels are
constructed explicitly for such a system.

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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ex