Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Binding energy of negative trions at high magnetic fields in a CdTe
  quantum well   We present results of numerical calculations of electronic states of an
exciton and a trion in a CdTe quantum well at magnetic fields up to 150T. The
exciton state and the trion states were computed using a variational procedure.
We estimated the binding energy of the trion in a singlet state with the
z-component of angular momentum L_z=0, as well as the binding energy of the
trion in a triplet state with L_z=-1. Recent experimental results show that
even up to 44T the binding energy of negative trion in a singlet state is
bigger than in a triplet state. We show that at a critical field B_c=65T the
two binding energies cross and above B_c the binding energy of the trion in a
triplet state is bigger than in the singlet state.

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The categories of this paper are: cs
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The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
24
The categories of this paper are: dg-ga