You'll have to do your own research about love. This thread is about deja vu, and yes, it's been electrically stimulated. I linked to this earlier:
Hypersynchronous. There's a long list of things that can cause it. Basically the brain requires that certain parameters be met in order for the neurons to fire normally. Anything that upsets those parameters can cause hypersynchronous firing.
I, personally, have had thousands of deja vu's. As a kid I had scarlet fever and they tell me my temperature got up to 106F. This probably caused some hippocampal sclerosis that predisposes me to hypersynchronous firing in that area of the brain.
I met a guy who had only had one deja vu in his whole life. His was after a long trip and occurred just as he arrived at his destination. His was probably purely "chemical", the result of lack of sleep, low blood sugar, the stress of travel, that sort of thing.
There's something called "kindling" that occurs. This means that whenever you experience hypersynchronous firing the neurons seem to become more sensitive. The parameters are narrowed, and it takes less provocation to to start the next occasion of hypersynchronous firing.