Superconductivity in Cu-doped Bi2Se3 with potential disorder

Sensitivity of superconducting states to the impurity location in layered materials

“…As we can infer from Table VI, all gap functions have a finite fitness measure, whose size depends on the details of the microscopic Hamiltonian. This aspect was already emphasized in previous works [24][25][26]. However, we also observe that the evolution of the share of symmetric configurations, S i (n), affects the scattering rate, which is a feature that does not depend on the structure of the Hamiltonian, but on the distribution of impurities.…”

“…Later, it became clear that for complex superconductors (with extra internal degrees of freedom such as orbitals or sublattices), the concept of superconducting fitness allows for a generalization of Anderson's theorem, providing an universal framework and explanation for the unusual robustness of unconventional superconducting states [13,21]. Specific results for Cudoped Bi 2 Se 3 report that the robustness of the superconducting state depends not only on the superconducting order parameter, but on details of the electronic structure in the normal state [24]. Recently, this understanding was corroborated by a more complete analysis of the sensitivity of pairing states to various scattering potentials in two-orbital systems [25,26].…”

Lifshitz transition in dirty nematic superconductor

“…Nematic superconductivity is suppressed by the large disorder that confirms results of Refs. [27][28][29]. The critical temperature depends on the parameter ζ that determines both the critical temperature in a clean case and robustness against the disorder according to Eqs.…”

“…In Refs. [26][27][28][29] effects of the disorder on critical temperature of nematic superconductor was studied. It was found that density disorder decreases critical temperature for the nematic order parameter.…”

General theory of robustness against disorder in multi-band superconductors

“…The existence of these novel "orbital" degree of freedom has been proposed to play an important role in both the normal state and superconducting properties [3][4][5][6][7][8]. In such superconductors, pairing may be isotropic in momentum without pairing time-reversed states [9][10][11][12][13][14][15][16], and there has hence been much recent interest in generalizing Anderson's theorem to account for such systems [17][18][19][20][21][22][23][24]. The effect of disorder in such systems is considerably more complicated due to the interplay of the internal spin-orbital structure of the superconducting states with the spin-orbital texture of the electronic system.…”