In a tight-binding extended Hubbard model, mixed singlet-triplet superconducting phases emerge below Tc, producing distinctive multi-peak density-of-states signatures that change with temperature.
Mixed-symmetry superconductivity and the energy gap
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abstract
The symmetry of the superconducting order parameter, or simply the ``gap'', provides certain constraints on the actual mechanism that gives rise to pairing and ultimately to superconductivity. In this work we show how superconducting phases with mixed singlet-triplet symmetries can arise below $T_c$ for a generic tight-binding model. We first examine the 1D case to better illustrate the prevalence of symmetry-breaking transitions below $T_c$, and then the more realistic 2D case. In both cases we illustrate the implication for spectroscopic investigations of the energy gap by calculating the density of states for different temperatures below $T_c$. We find that the structure of the density of states near $T_c$ can vary dramatically from its form near $T=0$. A complete picture of the superconducting symmetry can only be attained if measurements are made over the entire temperature range.
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Mixed-symmetry superconductivity and the energy gap
In a tight-binding extended Hubbard model, mixed singlet-triplet superconducting phases emerge below Tc, producing distinctive multi-peak density-of-states signatures that change with temperature.