Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shot Noise in Negative-Differential-Conductance Devices   We have compared the shot-noise properties at T = 4.2 K of a double-barrier
resonant-tunneling diode and a superlattice tunnel diode, both of which exhibit
negative differential-conductance (NDC) in their current-voltage
characteristics. While the noise spectral density of the former device was
greatly enhanced over the Poissonian value of 2eI in the NDC region, that of
the latter device remained 2eI. This result implies that charge accumulation,
not system instability, is responsible for shot-noise enhancement in NDC
devices.

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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
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The categories of this paper are: econ
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The categories of this paper are: quant-ph
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The categories of this paper are: cs
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th