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We report the electronic structures and transport properties of a chiralcrystal NbGe$_2$, which is a candidate for a coupled electron-phonon liquid.The electrical resistivity and thermoelectric power of NbGe$_2$ exhibit cleardifferences compared to those of NbSi2 even though both niobium ditetrelidesare isostructural and isoelectronic. We discuss the intriguing transportproperties of NbGe$_2$ based on a van Hove-type singularity in the density ofstates. The analysis of de Haas-van Alphen oscillations measured by the fieldmodulation and magnetic torque methods reveals the detailed shape of the Fermisurface of NbGe$_2$ by comparison with the results of energy band structurecalculations using a local density approximation. The electron and hole Fermisurfaces of NbGe$_2$ split into two because of the anti-symmetric spin-orbitinteraction. The temperature dependence of quantum oscillations indicates thatthe effective mass is isotropically enhanced in NbGe$_2$ due to strongelectron-phonon interaction.

Fermi surface topology and electronic transport properties of a chiral crystal NbGe$_2$ with strong electron-phonon interaction