Evidence of a Macroscopic-Flux Phase in an Asymmetric Quantum Well in a Tilted Quantizing Magnetic Field

Abstract

We demonstrate experimentally that in an asymmetric quantum well in presence of quantizing magnetic field tilted in XZ plane, confining potential V(z) lifts Landau level degeneracy related to position of the centers of electron cyclotron orbits along X axis. This results in arising of specific bands in which directed velocity of electrons along Y axis may be nonzero. We directly demonstrate that the electrons' velocity is in a one-to-one correspondence with the position of the centers of their cyclotron orbits that means spatially separated macroscopic electron fluxes should flow in opposite directions along Y axis even in the fully occupied bands. One-dimensional character of these fluxes is also demonstrated experimentally.