Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum inductance and negative electrochemical capacitance at finite
  frequency   We report on theoretical investigations of frequency dependent quantum
capacitance. It is found that at finite frequency a quantum capacitor can be
characterized by a classical RLC circuit with three parameters: a static
electrochemical capacitance, a charge relaxation resistance, and a quantum
inductance. The quantum inductance is proportional to the characteristic time
scale of electron dynamics and due to its existence, the time dependent current
can accumulate a phase delay and becomes lagging behind the applied ac voltage,
leading to a negative effective capacitance.

16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an