(Reuters) - The fervor around artificial intelligence has sparked a gold rush into AI-themed ETFs, as investors seek fresh ways to play the burgeoning technology following breathtaking rallies in market darlings such as Nvidia.

The funds run the gamut from those offering a bouquet of the biggest AI winners to more esoteric themes such as robotics and sound generation. All told, the universe of AI-themed ETFs traded in the United States has soared to $6.88 billion as of the end of February from $2.55 billion a year earlier, Morningstar data showed.