Nernst Effect as a Signature of Quantum Fluctuations in Quasi-1D Superconductors

摘要

We study a model for the transverse thermoelectric response due to quantumsuperconducting fluctuations in a two-leg Josephson ladder, subject to aperpendicular magnetic field B and a transverse temperature gradient. Theoff-diagonal Peltier coefficient (\alpha_{xy}) and the Nernst effect areevaluated as functions of B and the temperature T. The Nernst effect is foundto exhibit a prominent peak close to the superconductor-insulator transition(SIT), which becomes progressively enhanced at low T. In addition, we derive arelation to diamagnetic response: \alpha_{xy}= -M/T_0, where M is theequilibrium magnetization and T_0 a plasma energy in the superconducting legs.