Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Self Assembled II-VI Magnetic Quantum Dot as a Voltage-Controlled
  Spin-Filter   A key element in the emergence of a full spintronics technology is the
development of voltage controlled spin filters to selectively inject carriers
of desired spin into semiconductors. We previously demonstrated a prototype of
such a device using a II-VI dilute-magnetic semiconductor quantum well which,
however, still required an external magnetic field to generate the level
splitting. Recent theory suggests that spin selection may be achievable in
II-VI paramagnetic semiconductors without external magnetic field through local
carrier mediated ferromagnetic interactions. We present the first experimental
observation of such an effect using non-magnetic CdSe self-assembled quantum
dots in a paramagnetic (Zn,Be,Mn)Se barrier.

12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
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The categories of this paper are: quant-ph