Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherent Exciton Lasing in ZnSe/ZnCdSe Quantum Wells?   A new mechanism for exciton lasing in ZnSe/ZnCdSe quantum wells is proposed.
Lasing, occurring below the lowest exciton line, may be associated with a
BCS-like condensed (coherent) exciton state. This state is most stable at low
temperatures for densities in the transition region separating the exciton Bose
gas and the coherent exciton state. Calculations show the gain region to lie
below the exciton line and to be separated from the absorption regime by a
transparency region of width, for example, about 80 meV for a 90 Angstrom
ZnSe/Zn_(0.75)Cd_(0.25)Se quantum well. Experimental observation of the
transparency region using differential spectroscopy would confirm this picture.

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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: astro-ph
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The categories of this paper are: cs
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The categories of this paper are: physics
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: adap-org