Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum eigenstates and (pseudo-)classical accelerator modes of the
  Delta-Kicked Accelerator   The quantum dynamics of a periodically driven system, the delta-kicked
accelerator, is investigated in the semiclassical and pseudo-classical regimes,
where quantum accelerator modes are observed. We construct the evolution
operator of this classically chaotic system explicitly. If certain quantum
resonance conditions are fullfilled, we show one can reduce the evolution
operator to a finite matrix, whose eigenvectors are the quasi-eigenstates.
These are represented by their Husimi functions. In so doing, we are able to
directly compare the pure quantum states with the classical states. In the
semiclassical regime, the quantum states are found to be related to the
classical KAM tori and the classical accelerator modes. In contrast, the
quasi-eigenstates do not lie on the $\epsilon$-classical trajectories in the
pseudo-classical regime. This shows a clear and important distinction between
semiclassicality and the new type of pseudo-classicality found by Fishman,
Guarneri and Rebuzzini.

35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
3
The categories of this paper are: physics