Field-free Josephson diode effect in interacting chiral quantum dot junctions.

• Tác giả: Debika Debnath, Paramita Dutta
• Ngôn ngữ: eng
• Ký hiệu phân loại: 133.594 Types or schools of astrology originating in or associated with a
• Thông tin xuất bản: England : Journal of physics. Condensed matter : an Institute of Physics journal , 2025
• Bộ sưu tập: NCBI
• ID: 685366

Tóm tắt

We investigate chiral quantum dot (QD)-based Josephson junction and show the correlation-induced Josephson diode effect (JDE) in it. The presence of electron-electron interaction spontaneously creates an imbalance between up- and down-spin electrons during the non-equilibrium transport making the QD effectively magnetic. The simultaneous presence of the chirality and the interaction eventually results in the field-free JDE in our chiral QD junction. We employ the Keldysh non-equilibrium Green's function technique to study the behavior of the Josephson current (JC) and the rectification coefficient (RC) of our Josephson diode (JD). We show a sign-changing behavior of the RC with the Coulomb correlation and the lead-to-dot coupling strength and find the maximum magnitude of the RC sim 72\%for moderate interaction strength. Our proposed field-free JD based on interacting chiral QD may be a potential switching component in superconductor based devices.