I've met an INTP and an INTJ physicists and boy, do they inhabit different worlds.
The INTP guy does some really hard-core maths, coupled with a very philosophical approach to his science. He's interested in fundamental physics, why we are here, how did we get here, building coherent mega theory-of-everything logical structures. He is a very nice guy, charming in a goofy mysterious way. Once he worked on a single publication for a whole year, which he claims no one reads because it turned out embarrassingly impenetrable (unless you are another INTP). He's a pretty big guy in his field, but he has like. . . no students and no post-docs, only collaborators. He encourages a lot of reading (i.e. taking in information), and he himself reads A LOT.
The INTJ guy is very results-oriented. He likes to say learning is important but you need to get some results *insert terrifying war commando aura*. He's almost a publishing house, and he has this somewhat... aggressive feel to him. Like... even when he's nice and stuff, there's a bite to it and Ps like me feel a bit like we've got to watch out. He thinks theory-of-everything/interpretations of quantum mechanics/etc. stuff is "interesting" but ultimately useless. He has these quirky ideas that go against the grain but he can argue for them till he turns red and blue and ultimately the other person caves in from either agreeing with him or from sheer terror+fatigue.
But usually these quirky ideas end up being pretty much on the ball.
He is also very very precise, and he hates when people waffle. Unlike the somewhat impenetrable publications of the INTP, he writes tersely, to the point, precisely and confidently. When you read his stuff, there's none of the philosophical ramblings and complicated wordings of the INTP, but more of a: THIS IS IT FOOLS, YOU KNOW IT'S TRUE. Usually there will also be an I AM RIGHT YOU ARE WRONG, AND THIS IS WHY.