De Haas-van Alphen quantum oscillations in LuSn$_{2}$

We have successfully synthesized single crystals of binary compound LuSn$_{2}$ and observed strong De Haas-van Alphen (dHvA) quantum oscillations with three oscillation frequencies ($F_{\alpha } \quad =$ 70T, $F_{\beta \, }=$ 422T and $F_{\gamma } \quad =$ 511T for H//c) in this material. From the analyses of dHvA oscillations, the quasi-particles of this material are found to be very light (m$_{\alpha \, }=$ 0.053 m$_{0}$, m$_{\beta \, }=$ 0.067 m$_{0,\, }$m$_{\gamma } \quad =$ 0.072 m$_{0,}$ where m$_{0}$ is the mass of a bare electron) and possess high quantum mobility (2500 cm$^{2}$/VS for $F_{\alpha \, }$band). For the $F_{\alpha }$ component, the evidence of non-trivial Berry phase was also revealed from the fit the of the oscillation pattern to the Lifshitz-Kosevich formula which takes Berry phase into account for a topological material. The angular dependence of $F_{\alpha }$ indicates the $F_{\alpha }$ band is quasi-two dimensional. These observations imply possible existence of a quasi-2D bulk Dirac state in LuSn$_{2}$. This result calls for further verification by first-principle calculations and ARPES experiments.