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<DIV>Hi Fred,</DIV>
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<DIV>When the calculation is done without spin-orbit all through, the plot of the optical conductivity for both the up and down spin contributions both have negative parts.</DIV>
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<DIV>Thanks</DIV>
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<DIV>C M I Okoye </DIV></TD></TR>
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<P><FONT face=courier>Chukwu<STRONG>emeka</STRONG> M I Okoye</FONT></P>
<P><FONT face=courier>Department of Physics and Astronomy,</FONT></P>
<P><FONT face=courier>University of Nigeria,Nsukka,</FONT></P>
<P><FONT face=courier>Enugu State, <STRONG>Nigeria</STRONG>.</FONT></P>
<P><FONT face=courier>+2348045257257</FONT></P>
<P><FONT face=courier>+234 42 771611</FONT></P></TD></TR>
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