Doping-dependent charge dynamics in CuxBi2Se3

Abstract

Superconducting CuxBi2Se3 has attracted significant attention as a candidate topological superconductor. Besides inducing superconductivity, the introduction of Cu atoms to this material has also been observed to produce a number of unusual features in DC transport and magnetic susceptibility measurements. To clarify the effect of Cu doping, we have performed a systematic optical spectroscopic study of the electronic structure of CuxBi2Se3 as a function of Cu doping. Our measurements reveal an increase in the conduction band effective mass, while both the free carrier density and lifetime remain relatively constant for Cu content greater than x=0.15. The increased mass naturally explains trends in the superfluid density and residual resistivity as well as hints at the complex nature of Cu doping in Bi2Se3.

7 pages, 4 figures

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• Topological insulators and superconductors
• Topological Insulator Materials
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• Evolution of the fermi surface of a doped topological insulator with carrier concentration
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• Lattice QCD and heavy ion collisions: a review of recent progress
• Superconducting doped topological materials
• Dependence of superconductivity in CuxBi2Se3 on quenching conditions
• Field Correlator Method for the confinement in QCD
• Majorana Zero-Modes in a Two-Dimensional $p$-Wave Superconductor
• Internal pressure in superconducting Cu intercalated Bi${}_2$Se${}_3$
• Towards the quark--gluon plasma Equation of State with dynamical strange and charm quarks
• The hole Fermi surface in Bi${}_2$Se${}_3$ probed by quantum oscillations
• Conformality and percolation threshold in neutron stars
• Static quark anti-quark interactions at non-zero temperature from lattice QCD
• Rotating Majorana Zero Modes in a disk geometry