Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electric field induced nucleation: An alternative pathway to metallic
  hydrogen   Electric field induced nucleation is introduced as a possible mechanism to
realize a metallic phase of hydrogen. Analytical expressions are derived for
the nucleation probabilities of both thermal and quantum nucleation in terms of
material parameters, temperature, and the applied field. Our results show that
the insulator-metal transition can be driven by an electric field within a
reasonable temperature range and at much lower pressures than the current
paradigm of P > 400 GPa. Both static and oscillating fields are considered and
practical implementations are discussed.

9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
2
The categories of this paper are: math