Spectroscopic imaging STM studies of broken electronic symmetries in underdoped cuprates
Physica B Condensed Matter Elsevier 407:11 (2012) 1859-1863
Picometer registration of zinc impurity states in Bi2Sr2CaCu2O8+δ for phase determination in intra-unit-cell Fourier transform STM
New Journal of Physics IOP Publishing 14:5 (2012) 053017
Anisotropic energy gaps of iron-based superconductivity from intraband quasiparticle interference in LiFeAs.
Science (New York, N.Y.) 336:6081 (2012) 563-567
Abstract:
If strong electron-electron interactions between neighboring Fe atoms mediate the Cooper pairing in iron-pnictide superconductors, then specific and distinct anisotropic superconducting energy gaps Δ(i)(k) should appear on the different electronic bands i. Here, we introduce intraband Bogoliubov quasiparticle scattering interference (QPI) techniques for determination of Δ(i)(k) in such materials, focusing on lithium iron arsenide (LiFeAs). We identify the three hole-like bands assigned previously as γ, α(2), and α(1), and we determine the anisotropy, magnitude, and relative orientations of their Δ(i)(k). These measurements will advance quantitative theoretical analysis of the mechanism of Cooper pairing in iron-based superconductivity.Spectroscopic Imaging Scanning Tunneling Microscopy Studies of Electronic Structure in the Superconducting and Pseudogap Phases of Cuprate High-Tc Superconductors
Journal of the Physical Society of Japan Physical Society of Japan 81:1 (2012) 011005
How Kondo-holes create intense nanoscale heavy-fermion hybridization disorder.
Proceedings of the National Academy of Sciences of the United States of America 108:45 (2011) 18233-18237