Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chaotic front dynamics in semiconductor superlattices   We analyze the dynamical evolution of the current and the charge density in a
superlattice for fixed external dc voltage in the regime of self-sustained
current oscillations, using a microscopic sequential tunneling model. Fronts of
accumulation and depletion layers which are generated at the emitter may
collide and annihilate, thereby leading to a variety of different scenarios. We
find complex chaotic regimes at high voltages and low contact conductivities.

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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
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The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: nlin
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The categories of this paper are: cs
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The categories of this paper are: dg-ga
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc