Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 56: Superconductivity: Theory I

TT 56.5: Talk

Wednesday, March 11, 2026, 16:00–16:15, CHE/0089

Enhanced Superconductivity in Proximity to Peaks in Densities of States — •Joshua Althüser¹, Ilya Eremin², and Götz S. Uhrig¹ — ¹TU Dortmund, Otto-Hahn-Straße 4, 44227 Dortmund, Germany — ²Institut für Theoretische Physik III, Ruhr-Universität Bochum, 44801 Bochum, Germany

For the BCS theory of superconductivity, the electron-phonon interaction is transformed to an attractive electron-electron interaction in the vicinity of the Fermi energy only. An optimized transformation, however, reveals that the electrons attract one another whenever their energies do not differ more than the phonon energy ω_D. Consequently, the order parameter becomes finite even away from the Fermi energy. Intriguingly, an accumulation of density-of-states at an energy ε_Peak in proximity to the Fermi energy induces a significant order parameter around ε_Peak, which easily exceeds the one at E_F for moderate coupling strengths. We predict measurable signatures in the thermodynamic and spectroscopic response of this unexpected phenomenon, guiding future experimental searches for it.

Keywords: Superconductivity; Effective electron–electron attraction; Enhanced $T_C$