Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thomas-Fermi approach to resonant tunneling in delta-doped diodes   We study resonant tunneling in B-$\delta$-doped diodes grown by Si-molecular
beam epitaxy. A Thomas-Fermi approach is used to obtain the conduction-band
modulation. Using a scalar Hamiltonian within the effective-mass approximation
we demonstrate that the occurrence of negative differential resistance (NDR)
only involves conduction-band states, whereas interband tunneling effects seem
to be negligible. Our theoretical results are in very good agreement with
recent experimental observations of NDR in this type of diodes.

3
The categories of this paper are: physics
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th