Andreev reflection and superconducting bound states in high-Tc junctions

Goran P. Wendin; Tomas Loefwander; Vitaly S. Shumeiko

doi:10.1117/12.397840

6 September 2000 Andreev reflection and superconducting bound states in high-T_c junctions

Goran P. Wendin, Tomas Loefwander, Vitaly S. Shumeiko

Proceedings Volume 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV; (2000) https://doi.org/10.1117/12.397840
Event: AeroSense 2000, 2000, Orlando, FL, United States

Abstract

Midgap states (MGS) exist at the Fermi level at surfaces and interfaces of d-wave superconductors for order parameter orientations such that a sign change of Andreev reflection can add a (pi) -shift in the Bohr-Sommerfeld quantization condition. MGS are basically robust features, but the detailed density of states, manifested e.g. in zero bias conductance peaks (ZBCP), is in principle a sensitive probe of junctions and interfaces, providing information about normal regions with suppressed order parameter, non-specular scattering from rough or disordered interfaces, impurity states, lifetimes, etc. Resonance coupling of MGS in d₄₅/d_{+/- 45} SNINS junctions gives rise to large equilibrium Josephson critical current varies direct as (root)D, where D is the normal transparency of the junction. Spontaneous time-reversal symmetry breaking (TRSB) in d₀/d₄₅ junctions at low temperatures k_BT << D(Delta) ₀ is driven by a gain in Josephson energy for transparencies D >> (epsilon) ₀/(lambda) .

Citation Download Citation

Goran P. Wendin, Tomas Loefwander, and Vitaly S. Shumeiko "Andreev reflection and superconducting bound states in high-T_c junctions", Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000); https://doi.org/10.1117/12.397840

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