Quantum Oscillations in CuₓBi₂Se₃ in High Magnetic Fields
CuxBi2Se3 has drawn much attention as the leading candidate to be the first topological superconductor and the realization of coveted Majorana particles in a condensed matter system. However, there has been increasing controversy about the nature of its superconducting phase. This study sheds light on ambiguity in the normal-state electronic state by providing a complete look at the quantum oscillations in magnetization in CuxBi2Se3 at high magnetic fields up to 31 T. Our study focuses on the angular dependence of the quantum oscillation pattern in a low carrier concentration. As the magnetic field tilts from the crystalline c axis to the ab plane, the change of the oscillation period follows the prediction of the ellipsoidal Fermi surface. As the doping level changes, the 3D Fermi surface becomes quasicylindrical at high carrier density. Such a transition is potentially a Lifshitz transition of the electronic state in CuxBi2Se3.
B. J. Lawson et al., "Quantum Oscillations in CuₓBi₂Se₃ in High Magnetic Fields," Physical review B: Condensed matter and materials physics, vol. 90, no. 19, American Physical Society (APS), Nov 2014.
The definitive version is available at https://doi.org/10.1103/PhysRevB.90.195141
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01 Nov 2014