Diamonds shine a light on hidden currents in
graphene

It sounds like pure sorcery: using diamonds to observe
invisible power swirling and flowing through carefully crafted
channels. But these diamonds are a reality. JQI Fellow Ronald
Walsworth and Quantum Technology Center (QTC) Postdoctoral
Associate Mark Ku, along with colleagues from several other
institutions, including Professor Amir Yacoby and Postdoctoral
Fellow Tony Zhou at Harvard, have developed a way to use diamonds
to see the elusive details of electrical currents.