How to write e^(-1000|t|) in matlab title?
You can write e^(-1000*|t|) in Matlab in colored form if you want as 

title('\ite^{-1000 |t|}','Color','b') 
Here,"b" is for blue color ,"r" for red,"g" for greeen.

For subscript use _ 

For superscript use ^

For exponential symbol use \ite ,

For lambda symbol use \lambda 

For alpha use \alpha.