In the 196zeroes, an exotic phase of matter known as an excitonic insulator was proposed. Decades later, evidence for this phase was found in real materials. Recently, particular attention has centered on Ta2NiSe5 because an excitonic insulator phase may exist in this material at room temperatures. The substance is made up of the elements tantalum, nickel, and selenium, and has the potential to lead to breakthroughs in more power-efficient, faster computers.