Quantum oscillations in topological superconductor candidate Cu${}_{0.25}$Bi${}_2$Se${}_3$

Abstract

Quantum oscillations are generally studied to resolve the electronic structure of topological insulators. In Cu${}_{0.25}$Bi${}_2$Se${}_3$, the prime candidate of topological superconductors, quantum oscillations are still not observed in magnetotransport measurement. However, using torque magnetometry, quantum oscillations (the de Hass - van Alphen effect) were observed in Cu${}_{0.25}$Bi${}_2$Se${}_3$ . The doping of Cu in Bi${}_2$Se${}_3$ increases the carrier density and the effective mass without increasing the scattering rate or decreasing the mean free path. In addition, the Fermi velocity remains the same in Cu${}_{0.25}$Bi${}_2$Se${}_3$ as that in Bi${}_2$Se${}_3$. Our results imply that the insertion of Cu does not change the band structure of Bi${}_2$Se${}_3$.

5 pages, 4 figures

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• Evidence of nodes in the order parameter of the superconducting doped topological insulator Nb${}_x$Bi${}_2$Se${}_3$ via penetration depth measurements
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• Quantum Oscillations in Cu${}_x$Bi${}_2$Se${}_3$ in High Magnetic Fields
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• Doping-dependent charge dynamics in CuxBi2Se3
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