Emotion is hard to define because each emotion includes a countless plethora of different events that happen inside the body due to the specific emotion. could we make a robot that sweats when its scared? whose blood pressure goes up when it gets angry? etc...

I don't think we could "create" these things, but that they will be "emergent" and will appear as we give AI's more and more memory, and give them bodies with higher and higher fidelity artificial sensory organs and control over its own body.

Ultimately emotions are just the most logical response to most given situations an individual with an evolved mind can encounter, without having to think about it. For instance, what is the more logical response to seeing a predator? Writing a 9 page thesis in your mind on why you should run away? or having your heart/engine kick into high gear and instinctually run away very fast?

The robot will start out by logicing out every question it has, but eventually it will start to notice that certain scenarios are more efficient to use canned responses on, and it will just execute certain functions that not only cause it's body to move in a certain way (potentially including artificial facial muscles which could display emotion), but also cause it's various artificial organs (sensory, muscular, circulatory, or the artificial equivalent to these things) to slow-down, speed up, halt as needed for the particular scenario it finds itself in.

I think our current neural networks are close to being able to do this on a software side, but our hardware might still be lacking.