Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Admittance and Nonlinear Transport in Quantum Wires, Point Contacts, and
  Resonant Tunneling Barriers   We present a discussion of the admittance (ac-conductance) and nonlinear
I-V-characteristic for a number of mesoscopic conductors. Our approach is based
on a generalization of the scattering approach which now includes the effects
of the (long-range) Coulomb interaction. We discuss the admittance of a wire
with an impurity and with a nearby gate. We extend a discussion of the
low-frequency admittance of a quantum point contact to investigate the effects
of the gates used to form the contact. We discuss the nonlinear I-V
characteristic of a resonant double barrier structure and discuss the
admittance for the double barrier for a large range of frequencies. Our
approach emphasizes the overall conservation of charge (gauge invariance) and
current conservation and the resulting sum rules for the admittance matrix and
nonlinear transport coefficients.

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The categories of this paper are: physics
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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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: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: quant-ph