Local Spectral Inversion and Bosonic Fine Structure Extraction via   Superconducting Scanning Tunneling Spectroscopy
  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. 
F. C. Niestemski, S. Johnston, A. W. Contryman, C. D. Camp, T. P.   Devereaux, H. C. Manoharan
cond-mat.supr-con cond-mat.mes-hall