Heterostructures support predictions of counterpropagating charged edge modes at the v=2/3 fractional quantum Hall state

In 2018, a team of physicists at Purdue University invented a device which experimentally showed quasiparticles interfering for the first time in the fractional quantum Hall effect at filling factor v=1/3. Further development of these heterostructures has allowed the Manfra Group to expand their research to experiments that explore counterflowing charged edge modes at the 2/3 fractional quantum Hall state.