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Transport in a two-dimensional electron gas subject to an external magneticfield is analyzed in the presence of a \textit{longitudinal barrier.} We showthat \textit{quantum interference of the edge states} bound by the longitudinalbarrier results in a drastic change of the electron motion: the degeneratediscrete Landau levels are transformed into an alternating sequence of energybands and energy gaps. These features of the electron spectrum should result ina high sensitivity of thermodynamic and transport properties of the 2D electrongas to external fields. In particular, we predict giant oscillations of theballistic conductance and discuss nonlinear current-voltage characteristics,coherent Bloch oscillations and effects of impuritiesComment: 4 pages, 3 figure

Magnetotransport along a barrier: Multiple quantum interference of edge states