Impurity states and marginal stability of unconventional ...

Superconductivity primer
Metal
Superconductor
Cooper
pairs
(k & -k)
ε
n
ε
E n
E
EF
N(ε)
2∆
EF
N(E)
2
k
= 2 m
ε
k
− E 2 2
F
Ek
= ± ε
k
+ ∆
Electrons:
c , c
k↑ k↓
Bogoliubov q.particles:
γ , γ ( γ u +
↑ ↓ ↑ kc
v
↑
k
k
k
+
=
kc
k −k↓
)