Scanning tunneling microscopy of superconducting topological surface states in Bi2Se3

被引：7
|
作者：
Dayton, Ian M. [1 ]
Sedlmayr, Nicholas [1 ]
Ramirez, Victor [1 ]
Chasapis, Thomas C. [2 ]
Loloee, Reza [1 ]
Kanatzidis, Mercouri G. [2 ]
Levchenko, Alex [3 ]
Tessmer, Stuart H. [1 ]
机构：
[1] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA
[2] Northwestern Univ, Dept Chem, 2145 Sheridan Rd, Evanston, IL 60208 USA
[3] Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA
来源：
PHYSICAL REVIEW B | 2016年 / 93卷 / 22期
关键词：
SINGLE DIRAC CONE; INSULATOR; COEXISTENCE; ORDER;
D O I：
10.1103/PhysRevB.93.220506
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this Rapid Communication we present scanning tunneling microscopy of a large Bi2Se3 crystal with superconducting PbBi islands deposited on the surface. Local density of states measurements are consistent with induced superconductivity in the topological surface state with a coherence length of order 540 nm. At energies above the gap the density of states exhibits oscillations due to scattering caused by a nonuniform order parameter. Strikingly, the spectra taken on islands also display similar oscillations along with traces of the Dirac cone, suggesting an inverse topological proximity effect.
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页数：5
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