1211.2244 (F. C. Niestemski et al.)

Local Spectral Inversion and Bosonic Fine Structure Extraction via
Superconducting Scanning Tunneling Spectroscopy    [PDF]

F. C. Niestemski, S. Johnston, A. W. Contryman, C. D. Camp, T. P. Devereaux, H. C. Manoharan

We perform the scanning tunneling spectroscopy based superconductor-vacuum-superconductor analogue to the seminal McMillan and Rowell superconductor-insulator-superconductor device study of phonons in the archetypal elemental superconductor Pb [W. L. McMillan and J. M. Rowell, Phys. Rev. Lett. 14, 108 (1965)]. We invert this spectroscopic data utilizing strong-coupling Eliashberg theory to obtain a local {\alpha}^2F({\omega}) and find broad underlying agreement with the pioneering results, highlighted by previously unobserved electron-hole asymmetries and new fine structure which we discuss in terms of both conventional and unconventional superconducting bosonics.

View original: http://arxiv.org/abs/1211.2244