[Tex/LaTex] Package PGF Math Error: Could not parse input as a floating point number

pgfmathpgfplotstable

I'm trying to format this beautiful table given as an answer to Beautiful table samples. If you look at the third column, you can see that the unit is given in eV. I would like to add latex formulae with powers of ten to this column, but when I do, I get an error message:

Package PGF Math Error: Could not parse input '$10^6$' as a floating point number.

What can I do to insert latex math into this column? Thanks!

this beautiful table

Code:

\documentclass{article}

\usepackage{unicode-math}
\setmainfont[Mapping=tex-text, Numbers=OldStyle]{TeX Gyre Pagella}
\setmathfont[math-style=ISO]{TeX Gyre Pagella Math}

\usepackage{siunitx}
\usepackage{xcolor}
\usepackage{booktabs,colortbl, array}
\usepackage{pgfplotstable}
\pgfplotsset{compat=1.8}

\definecolor{rulecolor}{RGB}{0,71,171}
\definecolor{tableheadcolor}{gray}{0.92}
% Following is taken from Werner: https://tex.stackexchange.com/a/33761/3061
% and modified for my needs
%
% Command \topline consists of a (slightly modified)
% \toprule followed by a \heavyrule rule of colour tableheadcolor
% (hence, 2 separate rules)
\newcommand{\topline}{ %
        \arrayrulecolor{rulecolor}\specialrule{0.1em}{\abovetopsep}{0pt}%
        \arrayrulecolor{tableheadcolor}\specialrule{\belowrulesep}{0pt}{0pt}%
        \arrayrulecolor{rulecolor}}
% Command \midline consists of 3 rules (top colour tableheadcolor, middle colour black, bottom colour white)
\newcommand{\midtopline}{ %
        \arrayrulecolor{tableheadcolor}\specialrule{\aboverulesep}{0pt}{0pt}%
        \arrayrulecolor{rulecolor}\specialrule{\lightrulewidth}{0pt}{0pt}%
        \arrayrulecolor{white}\specialrule{\belowrulesep}{0pt}{0pt}%
        \arrayrulecolor{rulecolor}}
% Command \bottomline consists of 2 rules (top colour
\newcommand{\bottomline}{ %
        \arrayrulecolor{white}\specialrule{\aboverulesep}{0pt}{0pt}%
        \arrayrulecolor{rulecolor} %
        \specialrule{\heavyrulewidth}{0pt}{\belowbottomsep}}%


\newcommand{\midheader}[2]{%
        \midrule\topmidheader{#1}{#2}}
\newcommand\topmidheader[2]{\multicolumn{#1}{c}{\textsc{#2}}\\%
                \addlinespace[0.5ex]}

\pgfplotstableset{normal/.style ={%
        header=true,
        string type,
        font=\addfontfeature{Numbers={Monospaced}}\small,
        column type=l,
        every odd row/.style={
            before row=
        },
        every head row/.style={
            before row={\topline\rowcolor{tableheadcolor}},
            after row={\midtopline}
        },
        every last row/.style={
            after row=\bottomline
        },
        col sep=&,
        row sep=\\
    }
}

\begin{document}
    \begin{table}
        \centering
        \caption{The bandgab of some semiconductors.}
        \pgfplotstabletypeset[normal,
                columns/eg/.style={
                column name={$E_{\textup{g}}$ (\si{\electronvolt})},
                dec sep align
        }
        ]{ %
        Material        & Symbol &  eg  & Type \\
        \topmidheader{5}{Elements}
        diamond         & C      & 5.46 & i \\
        silicon         & Si     & 1.12 & i \\
        germanium       & Ge     & 0.67 & i \\
        selenium        & Se     & 1.74 & d \\
        \midheader{5}{IV-IV Compounds}
        silicon carbide & SiC 3C & 2.36 & i \\
        silicon carbide & SiC 4H & 3.28 & i \\
        silicon carbide & SiC 6H & 3.03 & i \\
        \midheader{5}{III-V Compounds}
        indium phosphide& InP    & 1.27 & d \\
        indium arsenide & InAs   & 0.355& d \\
        gallium nitride & GaN    & 3.37 & d \\
        gallium arsenide& GaAs   & 1.42 & d \\
        aluminium nitride & AlN  & 6.2  & d \\
        }
\end{table}
\end{document}

Best Answer

I cannot see the problems. But there are three ways to achieve what you want

column name={$E_{\textup{g}}$ (\si{\mega\electronvolt})},


column name={$E_{\textup{g}}$ (\si{10^6\cdot\electronvolt})},


    diamond         & C      & 5.46e6 & i \\
    silicon         & Si     & 1.12e7 & i \\
    germanium       & Ge     & 0.67e8 & i \\
    selenium        & Se     & 1.74e9 & d \\

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