Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A possible minimum toy model with negative differential capacitance for
  self-sustained current oscillation   We generalize a simple model for superlattices to include the effect of
differential capacitance. It is shown that the model always has a stable
steady-state solution (SSS) if all differential capacitances are positive. On
the other hand, when negative differential capacitance is included, the model
can have no stable SSS and be in a self-sustained current oscillation behavior.
Therefore, we find a possible minimum toy model with both negative differential
resistance and negative differential capacitance which can include the
phenomena of both self-sustained current oscillation and $I-V$ oscillation of
stable SSSs.

32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an