Interband transition orbit probed in de Haas-van Alphen oscillations in the (double) Dirac semimetal NbTe4.

NbTe4undergoes multiple charge density wave transitions that have attracted great interest in this material for decades. Previous work has shown that the crystal obtains the space groupP4/ncc(130) at temperatures below 50 K which allows for the existence of eightfold degenerate double Dirac points in the band structure. We provide insights into the electronic structure of this material through density functional theory calculations, and a rotation study of de Haas-van Alphen oscillations in the magnetic torque. We find that NbTe4exhibits magnetic breakdown orbits between electron and hole pockets.