Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-flip transitions between Zeeman sublevels in semiconductor quantum
  dots   We have studied spin-flip transitions between Zeeman sublevels in GaAs
electron quantum dots. Several different mechanisms which originate from
spin-orbit coupling are shown to be responsible for such processes.
  It is shown that spin-lattice relaxation for the electron localized in a
quantum dot is much less effective than for the free electron. The spin-flip
rates due to several other mechanisms not related to the spin-orbit interaction
are also estimated.

23
The categories of this paper are: solv-int
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat