Time-reversal symmetry breaking and spontaneous currents in s-wave/normal-metal/d-wave superconductor sandwiches
Andrea Huck, Anne van Otterlo, Manfred Sigrist
DOI 10.1103/PhysRevB.56.14163 · Physical Review B
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Abstract
We study the physical properties of an s-wave–normal-metal–d-wave junction in terms of the Andreev bound-state solutions to the Bogoliubov–de Gennes equation in the normal-metal layer. The phase dependence of bound states with different orientations leads to superconducting states with broken time-reversal symmetry for generic orientations of the d-wave superconductor crystal. The occurrence of such a state and the associated spontaneous supercurrent along the junction and magnetic field is analyzed also in the framework of Ginzburg-Landau theory.
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