Experiments in pulsed magnetic fields at AT&T Bell Laboratories

Abstract

We review a pair of experiments performed in the pulsed magnets at AT&T Bell Laboratories. Resonant tunneling experiments directly measure the two-dimensional (2-D) density of states of a quantum well, including a series of energy level anti-crossings due to magnetopolaron formation. These experiments also study the degenerate 2-D emitter, directly measuring chemical potential jumps at both integer and fractional Landau level fillings. Pulsed field studies of the Kondo insulator Ce 3Bi 4Pt 3 establish that a correlated insulating ground state forms at low temperatures. Magnetic fields of ∼50 T suppress the Kondo interaction and the associated collective energy gap.