Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum versus classical hyperfine-induced dynamics in a quantum dot   In this article we analyze spin dynamics for electrons confined to
semiconductor quantum dots due to the contact hyperfine interaction. We compare
mean-field (classical) evolution of an electron spin in the presence of a
nuclear field with the exact quantum evolution for the special case of uniform
hyperfine coupling constants. We find that (in this special case) the
zero-magnetic-field dynamics due to the mean-field approximation and quantum
evolution are similar. However, in a finite magnetic field, the quantum and
classical solutions agree only up to a certain time scale t<\tau_c, after which
they differ markedly.

21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
16
The categories of this paper are: stat