Along with my post-doc, we have developed a functional renormalization group treatment of the asymmetry of the s-wave gap predicted in the iron-based superconductors.
Angle-resolved photoemission measurements in the superconducting state have revealed a quasiparticle spectrum with a d-wave gap structure that exhibits a maximum along the antinodal direction and vanishes along the nodal direction.
On the underdoped side, the superconducting state is often described in terms of one energy scale, associated with the maximum of the d-wave gap (at the antinodes), which increases as the doping decreases.
Feller, a professor of molecular and cell biology, is credited for her outstanding, influential, original discoveries in neuroscience, particularly mechanisms and development roles for activity waves, gap junctions and motion detection in the retina.
Dotted and solid curves denote those with and without a d-wave gap of Δ = 30 meV, respectively.
Furthermore, Figure1d indicates that the deviation from the d-wave gap penetrates into the close vicinity of the node and that it is difficult to define the pure d-wave region near the node.
In Figure1d,e, the obtained gap energies (small yellow circles) are plotted over the image of spectral intensity as a function of sin 2θ, so that the deviation from a d-wave gap is readily seen with reference to a straight line.
The next-order high-harmonic function is also expressed as Δ = ΔN sin 2θ + (Δ∗-ΔN)(3 sin 2θ- sin 6θ)/4, where the antinodal and nodal gap energies are defined as Δ∗ = Δ|θ=45° and Δ N = 1 2 ( d Δ / d θ ) θ = 0, respectively, so that ΔN/Δ∗ = 1 is satisfied for a pure d-wave gap. Figure 1 Superconducting gap manifested in BQP spectra.
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