Cool electrons to far below room temperature in certain solids with f orbitals, and they gain mass, acting like much heavier particles. In a new study our group has shown, for the first time, how these heavy electrons emerge from entanglement between conduction and f electrons and probed their composite nature. Our scanning tunneling microscopy experiments can also probe the life time of these emergent heavy electrons to show signatures of quantum criticality as our heavy electrons are on verge between antiferromagnetic and superconducting ground states.
Published in Nature: "Visualizing heavy fermions emerging in a quantum critical Kondo lattice," Pegor Aynajian, Eduardo H. da Silva Neto, András Gyenis, Ryan E. Baumbach, J. D. Thompson, Zachary Fisk, Eric D. Bauer, and Ali Yazdani, Nature 486, 201 (2012). (Article)