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Research
D-Wave Gap
In superconductors, resistance drops to zero below a critical temperature,
Tc. Microscopically, it is known that in the superconducting state,
electrons attract and form Cooper pairs, usually aided by phonons.
Cooper pairs in conventional, s-wave superconductors open up a uniform
gap (energy required to break the pairs) at the Fermi level. In high-temperature
copper-oxide superconductors, the gap seen in ARPES exhibits “d-wave” anisotropy
in momentum space—smallest along nodal direction ((0, 0) -
(π, π)) and largest near the anti-nodal point (π,
0).
