Přednášející: B. Rosenstein (National Chiao Tung University, Hsinchu, Taiwan, R.O.C.)
Místo: Knihovna FZÚ AV ČR, Cukrovarnická 10, Praha 6
Jazyk: anglicky
Pořadatelé:
Oddělení magnetik a supravodičů
Core excitations spectrum of the Abrikosov vortex pinned by a dielectric inclusion or nanohole of sizes of order of coherence length is considered using the Bogoliubov - de Gennes equations beyond semiclassical approximation. While the lowest excitation, minigap, in free (or pinned by a metallic defect) vortex is of order Δ²/EF, it becomes of the order of the superconducting gap Δ (EF is Fermi energy). The reconstruction of the quasiparticle excitations' spectrum has a significant impact on optical properties and tunneling density of states. We calculate the absorption amplitude and point out that, while in STM the energy gap ΔDOS is between a quasiparticle state with angular momentum μe = μ0 > 1/2 and quasihole with μh = - μ0, the microwave absorption gap, Δdir, is between the states with μe = μmin = μh ± 1. It is shown Δdir > ΔDOS.
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