```
$$
\setcounter{MaxMatrixCols}{28}
\setlength{\arraycolsep}{0.1pt}
\renewcommand{\arraystretch}{0.5}
\begin{pmatrix}
\centering
0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & -t_{J_2AB} & -t_{J_2AB} & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\ 
0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & -t_{J_2BA} & -t_{J_2BA} & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\ 
0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & -t_{J_2AB} & -t_{J_2AB} & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\ 
0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & -t_{J_2BA} & -t_{J_2BA} & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\ 
0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & -t_{J_2AB} & -t_{J_2AB} & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\ 
0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & -t_{J_2BA} & -t_{J_2BA} & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\ 
0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & -t_{J_2AB} & -t_{J_2AB} & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\ 
0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & -t_{J_2AB} & -t_{J_2AB} & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\ 
0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & -t_{J_1AB} & -t_{J_1AB} & 0 & 0 & -t_{UAA} & 0 & -t_{UAA} & 0 \\
0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & -t_{J_1BA} & -t_{J_1BA} & 0 & 0 & -t_{UBB} & 0 & -t_{UBB} & 0 \\
0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & t_{J_1AB} & t_{J_1AB} & 0 & 0 & t_{UAA} & 0 & t_{UAA} & 0 \\
0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & t_{J_1BA} & t_{J_1BA} & 0 & 0 & t_{UBB} & 0 & t_{UBB} & 0 \\
-t & t & 0 & 0 & -t & t & 0 & 0 & U & 0 & 0 & 0 \\
0 & 0 & -t & t & 0 & 0 & -t & t & 0 & U & 0 & 0 \\
-t & t & 0 & 0 & -t & t & 0 & 0 & 0 & 0 & U & 0 \\
0 & 0 & -t & t & 0 & 0 & -t & t & 0 & 0 & 0 & U
\end{pmatrix}
$$

```

Can someone maybe help me to center this matrix in LaTeX? I tried `\centering`, `\centerline` or to move it, but nothing worked. Have anyone an idea why or what is else possible to do? 
Appreciate every kind of help ;)