Indian scientists in US create particles with negative mass
A University of Rochester team led by Indian physicists has claimed to create particles with negative mass in an atomically thin semiconductor, by causing it to interact with confined laser light. Co-lead researchers Sajal Dhara (now at IIT Kharagpur) and Chitraleema Chakraborty created negative mass by combining semiconductor particles called excitons with photons from lasers to make polaritons.