How to change the email footnote symbols to math symbols in the APS revtex?

Question

How to change the email footnote symbol shown below "*" to some other math symbols, such as the symbol with subscript "b$_1$", "b$_2$", "c$_3$", "a$_4$"? (for paper with four authors, "b$_1$" for the first author, and so on.)

\documentclass[ap, notitlepage, superscriptaddress]{revtex4-1}
\begin{document}
\begin{titlepage}
\author{1st Author b$_1$}
\email{abc@gmail.com}
\author{2nd Author b$_2$}
\email{b2@gmail.com}
\author{3rd Author c$_3$}
\email{c3@gmail.com}
\author{4th Author a$_4$}
\email{a4@gmail.com}
\maketitle
\end{titlepage}
\end{document}

This is a false example. I hope to change * to b$_1$, and so on others to b$_2$, c$_3$, and a$_4$.

Question: How to change the Email symbol with definite symbols, that we can specify by hand:

the 1st Author with Email symbol b$_1$,
the 2nd Author with Email symbol b$_2$,
the 3rd Author with Email symbol c$_3$,
the 4th Author with Email symbol a$_4$. and so on that, we can specify each by hand.

this post maybe related but this seems not working for me for \documentclass[aps] ---- https://tex.stackexchange.com/q/394590/41144 — wonderich, Dec 21 '21 at 03:22
Using the code in the answer (not the answer but rather, the code that changes to alph) I was able to change the symbol to a or A. But I do not know how to add math into it. Maybe you could gobble the symbol altogether and Add it in the email string definition? — Elad Den, Dec 21 '21 at 08:52
Unrelated: note that revtex4-1 has been marked obsolete and revtex4-2 is now the recommended version — daleif, Dec 21 '21 at 08:56
@Elad Den, can you post your partial answer? thanks so much! — wonderich, Dec 21 '21 at 13:19
@wonderich It's unclear how the footnote marks should be chosen. — egreg, Dec 21 '21 at 13:36
Thanks, see update/clarify --- symbol with subscript "b$_1$", "b$_2$", "c$_3$", "a$_4$"? (for paper with four authors, "b$_1$" for the first author, and so on.) — wonderich, Dec 21 '21 at 13:46
Adding the following would change the footnote marks to arabic numerals, replace arabic with alph or Alph or roman to get something else.... \makeatletter \let\@fnsymbol@latex\@fnsymbol \let\@fnsymbol\@arabic \makeatother — Elad Den, Dec 21 '21 at 15:53
@wonderich So you are saying you want to name the author $b_1$ and that the symbol would be the name of the author? So if I name the author "Author McAuthorFace" I get Author McAuthorFace AMAF@somedomain.com in the mail footnote? — Elad Den, Dec 21 '21 at 15:55
I just want to change the 1st Author with Email symbol b$_1$, 2nd Author with Email symbol b$_2$ and so on. See my update! thanks! — wonderich, Dec 21 '21 at 15:57

Simon Dispa · Accepted Answer · 2021-12-21T18:59:35.607

Try this code. (Using revtex4-2}

Nine user-defined footnote marks were created for the email. (easily expanded). If any of the new ones are not used, the default mark will be used.

\documentclass[aps, notitlepage, superscriptaddress]{revtex4-2}
\makeatletter
\newcommand{\fmarki}{}
\newcommand{\fmarkii}{\ensuremath{\dagger}}
\newcommand{\fmarkiii}{\ensuremath{\ddagger}}
\newcommand{\fmarkiv}{\ensuremath{\mathsection}}
\newcommand{\fmarkv}{\ensuremath{\mathparagraph}}
\newcommand{\fmarkvi}{\ensuremath{|}}
\newcommand{\fmarkvii}{*}
\newcommand{\fmarkviii}{\ensuremath{\dagger\dagger}}
\newcommand{\fmarkix}{\ensuremath{\ddagger\ddagger}}
\def@fnsymbol#1{{\ifcase#1\or \fmarki\or \fmarkii\or \fmarkiii\or \fmarkiv\or \fmarkv\or \fmarkvi\or \fmarkvii\or \fmarkviii\or \fmarkix \else@ctrerr\fi}}
\makeatother
%% ************************************  define new email marks
\renewcommand{\fmarki}{b$_1$}
\renewcommand{\fmarkii}{b$_2$}
\renewcommand{\fmarkiii}{c$_3$}
\renewcommand{\fmarkiv}{a$_4$}
\renewcommand{\fmarkv}{x$_5$}
% <<<<<<<<<<<<<< ..... use default for 6, 7 and 8
\renewcommand{\fmarkix}{z$_9$}
%% ************************************
\begin{document}
\begin{titlepage}


    \author{1st Author}
    \email{abc@gmail.com}

    \author{2nd Author}
    \email{def@gmail.com}

    \author{3rd Author}
    \email{ghi@gmail.com}

    \author{4th Author}
    \email{a4@gmail.com}

    \author{5th Author}
    \email{x5@gmail.com}

    \author{6st Author}
    \email{w6@gmail.com}

    \author{7nd Author}
    \email{x7@gmail.com}

    \author{8rd Author}
    \email{y8@gmail.com}

    \author{9th Author}
    \email{z9@gmail.com}    


    \maketitle
\end{titlepage}


\end{document}

See the alternatives-to-asterisk-and-star-for-superscripts nice answer.

Thanks, +1 this is nice. I am confused why do we need to restart with \newcommand{\fmarki}{*}? if we are going to \renewcommand{\fmarki}{b$_1$} ? Could you explain why this paragraph after \makeatletter is important? — wonderich, Dec 21 '21 at 22:22
@wonderich To have a default behavior in case a mark is not defined. See the cases of 6, 7 and 8. — Simon Dispa, Dec 21 '21 at 22:26

How to change the email footnote symbols to math symbols in the APS revtex?

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