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Observation of Majorana fermions in ferromagnetic atomic chains on a superconductor
High-resolution spectroscopic imaging techniques show that the onset of superconductivity, which gaps the electronic density of states in the bulk of the Fe chains, is accompanied by the appearance of zero-energy end-states, providing strong evidence for the formation of a topological phase and edge-bound Majorana fermions in atomic chains.
Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator.
It is shown that copper intercalation in the van der Waals gaps between the Bi2Se3 layers, yielding an electron concentration of approximately 2x10{20} cm{-3}, results in superconductivity at 3.8 K in CuxBi2 Se3 for 0.12<or=x<or =0.15.
Ubiquitous Interplay Between Charge Ordering and High-Temperature Superconductivity in Cuprates
This work used scanning tunneling microscopy and resonant elastic x-ray scattering measurements to establish the formation of charge ordering in the high-temperature superconductor Bi2Sr2CaCu2O8+x, indicating the similarity of charge organization competing with superconductivity across different families of cuprates.
Topological surface states protected from backscattering by chiral spin texture
It is demonstrated that the chiral nature of these states protects the spin of the carriers, potentially useful for spin-based electronics, in which long spin coherence is critical, and also for quantum computing applications, where topological protection can enable fault-tolerant information processing.
Development of Ferromagnetism in the Doped Topological Insulator Bi 2-x Mn x Te 3
The development of ferromagnetism in Mn-doped Bi_2Te_3 is characterized through measurements on a series of single crystals with different Mn content. Scanning tunneling microscopy analysis shows
Landau quantization and quasiparticle interference in the three-dimensional Dirac semimetal Cd₃As₂.
Scanning tunnelling microscopy measurements at sub-kelvin temperatures and high magnetic fields on the II-V semiconductor Cd3As2.2 show that defects mostly influence the valence band, consistent with the observation of ultrahigh-mobility carriers in the conduction band.
Visualizing Critical Correlations Near the Metal-Insulator Transition in Ga1-xMnxAs
Scanning tunneling microscopy reveals the import role of electron-electron interactions in a dilute magnetic semiconductor and shows that doping-induced disorder produces strong spatial variations in the local tunneling conductance across a wide range of energies.
Spatial Fluctuations of Helical Dirac Fermions on the Surface of Topological Insulators
Helical Dirac fermion states in topological insulators could enable dissipation-free spintronics and robust quantum information processors. A study of the influence of disorder on these states shows
Visualizing pair formation on the atomic scale in the high-Tc superconductor Bi2Sr2CaCu2O8+δ
The first spatially resolved measurements of gap formation in a high-Tc superconductor are reported, measuring on Bi2Sr2CaCu2O8+δ samples with different Tc values using scanning tunnelling microscopy and finding that every pairing gap develops locally at a temperature Tp, following the relation 2Δ/kBTp = 7.5.