Resonantly enhanced tunneling in a double layer quantum hall ferromagnet

Phys Rev Lett. 2000 Jun 19;84(25):5808-11. doi: 10.1103/PhysRevLett.84.5808.

Abstract

The tunneling conductance between two parallel 2D electron systems has been measured in a regime of strong interlayer Coulomb correlations. At total Landau level filling nuT=1 the tunnel spectrum changes qualitatively when the boundary separating the compressible phase from the ferromagnetic quantized Hall state is crossed. A huge resonant enhancement replaces the strongly suppressed equilibrium tunneling characteristic of weakly coupled layers. The possible relationship of this enhancement to the Goldstone mode of the broken symmetry ground state is discussed.