Caption automatically centered in a REVTeX document

Question

I'm recently writing an APS paper with REVTeX and encountered a problem. The captions in all figure and table floats are automatically centered instead of being fully justified. I tried \captionsetup but there are only options like raggedright or raggedleft. Can anyone tell me what I was missing? The following is the header of my document:

\documentclass[aps,prl,reprint,twocolumn,amsmath,amssymb,groupedaddress]{revtex4-1}

\usepackage[dvipdfm]{graphicx}% Include figure files
\usepackage{dcolumn}% Align table columns on decimal point
\usepackage{bm}% bold math
\usepackage{epstopdf}
\usepackage{graphicx}
\usepackage{caption}
\usepackage{subcaption}
\begin{document}

A typical figure environment is as follows:

\begin{figure}[h]
    \begin{subfigure}{0.24\textwidth}
            \includegraphics[width=\textwidth]{FIG11.eps}
            \label{fig:FIG11}
    \end{subfigure}~       
    \begin{subfigure}{0.24\textwidth}
            \includegraphics[width=\textwidth]{FIG12.eps}
            \label{fig:FIG12}
    \end{subfigure}
    \caption{Gate control when large magnitude control is allowed. (a) Z-gate control in Lorentzian-like environment. (b) Identity-gate control in Ohmic environment. Here $\epsilon(t)\leq20\omega_{0}$. }
    \label{fig: large control}        
\end{figure}

The strange thing is that there is a sample "apssamp.tex" in the REVTeX zip file provided by APS. I copy my figure environment and paste it into the sample file and the caption is fully justified. But if I copy a figure environment in the sample and paste it to my own tex file, I always get centered caption. That's why I suspect that the problem should be due to the header.

Answer 1

The caption package is not compatible with revtex4-1; you can still add captioned subfloats with

\usepackage[caption=false]{subfig}

in the preamble and a syntax such as

\subfloat[]{\label{fig:FIG11}%
  \includegraphics[width=0.24\textwidth]{FIG11.eps}%
}

In the optional argument of \subfloat you can supply also a subcaption; if empty, only the markers (a) (b) and so on will appear.