The Bear totem option for the Path of the Totem Warrior barbarian's Aspect of the Beast feature grants the following benefit if the Bear totem is chosen (PHB, p. 50):
Your carrying capacity (including maximum load and maximum lift) is
doubled, and you have advantage on Strength checks made to push, pull,
lift, or break objects.
If my Halfling barbarian takes the Path of the Totem Warrior and chooses the Bear totem at 6th level, can he wield a heavy weapon due to his carrying capacity doubling?
I'm not too familiar with how size mechanics and carrying capacity fit together.