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The momentum dependent splitting of spin-bands in an electronic system isknown as the "Rashba effect". Systems with the "Rashba effect" possess a Diracpoint in momentum space. An electron in a cyclotron orbit enclosing that Diracpoint in the reciprocal space gains a "Berry phase". We report here theShubnikov-de-Haas oscillations (SdH) at the conducting interface ofEuO-KTaO$_3$ (KTO). Observed SdH oscillations suggest the presence of two Fermisurfaces. For both the Fermi surfaces, we have seen the presence of anon-trivial "Berry phase" suggesting that the surfaces enclose the "Diracpoint". Thus the Berry phase originates from the inner and outer Fermi surfacesof the Rashba spin-split bands. As in topological insulators, two fold planarHall and anisotropic magnetoresistance have also been observed in EuO-KTO.Analyzing the SdH, Hall and magnetoresistance data, we have drawn a possibleband diagram near the Fermi surface.

Observation of Shubnikov-de Haas Oscillations, Non-trivial Berry Phase,  Planar Hall and Anisotropic Magnetoresistance at the conducting interface of  EuO-KTaO$_3$