Two Dimensional Confinement of Heavy Fermions
2010. 6. 29


Metallic systems with the strongest electron correlations are realized in certain rare-earth and actinide compounds whose physics are dominated by f-electrons. These materials are known as heavy fermions, so called because the effective mass of the conduction electrons are enhanced via correlation effects up to as much as several hundreds times the free electron mass. To date the electronic structure of all heavy-fermion compounds is essentially three-dimensional.  Recently, we reported on the first realization of a two-dimensional heavy-fermion system, where the dmensionality is adjusted in a controllable fashion by fabricating heterostructures using molecular beam epitaxy. Heavy fermions confined to two dimensions display striking deviations from the standard Fermi liquid low-temperature electronic properties.