Robot ETFs can electrify your portfolio's gains thanks to their focus on AI chipmakers and physical AI opportunities.Artificial intelligence (AI) has been the defining trend for the stock market. Some AI stocks have rocketed tenfold within five years, and AI exchange-traded funds (ETFs) have been some of the market's top-performing funds.However, the next big winners may be robot stocks and ETFs. These funds also ride AI tailwinds but focus on physical AI. Humanoid robots, drones, and AI-powered surgical to ...