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In mesoscopic electronic systems, the Fabry-P\'{e}rot (FP) oscillation isobserved in various 1D devices. As for higher dimensions, numerous transversechannels usually lead to dephasing that quenches the overall oscillation of theconductance. Up to now, the FP oscillation in 2D electronic systems is onlyreported in graphene-based devices, and very recently, the \emph{pn} junctionsof inverted InAs/GaSb double quantum well [Phys. Rev. X 10, 031007 (2020)]. Inthe latter, the band shape of a sombrero hat plays an essential role, whichintroduces a novel mechanism of electron-hole hybridization for the 2D FPoscillation. In this work, we propose that such a scenario can be generalizedto the 2D planar junction composed of low-density Rashba gas, where the bandbottom possesses a sombrero hat shape as well. We show that the backscatteringbetween the outer and inner Fermi circles dominates the FP interference andsignificantly suppresses the dephasing effect between different transversechannels, which leads to a visible oscillation of the tunneling conductance.Specially, the visibility of the oscillating pattern can be enhanced byapplying interface barriers, in contrast to that in the InAs/GaSb doublequantum well. Our results provide a promising way for the implementation of theFP oscillation in the 2D electron gas.

Fabry-P\'{e}rot interference in 2D low-density Rashba gas