Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron-electron interaction effects in quantum point contacts   We consider electron-electron interaction effects in quantum point contacts
on the first quantization plateau, taking into account all scattering
processes. We compute the low-temperature linear and nonlinear conductance,
shot noise, and thermopower, by perturbation theory and a self-consistent
nonperturbative method. On the conductance plateau, the low-temperature
corrections are solely due to momentum-nonconserving processes that change the
relative number of left- and right-moving electrons. This leads to a
suppression of the conductance for increasing temperature or voltage. The size
of the suppression is estimated for a realistic saddle-point potential, and is
largest in the beginning of the conductance plateau. For large magnetic field,
interaction effects are strongly suppressed by the Pauli principle, and hence
the first spin-split conductance plateau has a much weaker interaction
correction. For the nonperturbative calculations, we use a self-consistent
nonequilibrium Green's function approach, which suggests that the conductance
saturates at elevated temperatures. These results are consistent with many
experimental observations related to the so-called 0.7 anomaly.

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The categories of this paper are: hep-ph
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat