Yes, an opportunity attack is triggered.
The rules for how teleportation works with opportunity attacks without polearm master are as follows:
You also don't provoke an opportunity attack when you teleport or when someone or something moves you without using your movement, action, or reaction.
(PHB p.195) (emphasis added).
So in normal circumstances it would be impossible for a teleport to trigger an opportunity attack. However, the polearm master feat states:
While wielding a glaive, halberd, pike, or quarterstaff, other creatures provoke an opportunity attack from you when they enter your reach.
(PHB p.168) (emphasis added).
Since teleporting into someone's reach involves entering their reach we can assume that the prerequisites for an opportunity attack via the polearm master feat are met.
This interpretation of the rules relies on the belief that specific beats general and that the rules for a feat are more specific than the general rules regarding teleportation/opportunity attacks.