2017/07/13 by Sunghun Park, A. Levy Yeyati · 2 citations
Physics and Astronomy · #Andreev reflection #Bound state #Condensed matter physics #Hamiltonian (control theory) #Magnetic field #Nanowire #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum and electron transport phenomena #Quantum mechanics #Qubit #Spin (aerodynamics) #Spin–orbit interaction #Superconductivity #Topological Materials and Phenomena #Zeeman effect #cond-mat.mes-hall #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.96.125416
published as Phys. Rev. B 96, 125416 (2017) · 14 pages, 6 figures, 3 appendices
arxiv created 2017/07/13 · openalex publication_date 2017/09/12 · arxiv updated 2017/09/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We theoretically analyze the Andreev bound states and their coupling to external radiation in superconductor-nanowire-superconductor Josephson junctions. We provide an effective Hamiltonian for the junction projected onto the Andreev level subspace and incorporating the effects of nanowire multichannel structure, Rashba spin-orbit coupling, and Zeeman field. Based on this effective model, we investigate the dependence of the Andreev levels and the matrix elements of the current operator on system parameters such as chemical potential, nanowire dimensions, and normal transmission. We show that the combined effect of the multichannel structure and the spin-orbit coupling gives rise to finite current matrix elements between odd-parity states having different spin polarizations. Moreover, our analytical results allow to determine the appropriate parameters range for the detection of transitions between even as well as odd states in circuit-QED-like experiments, which may provide a way for the Andreev spin-qubit manipulation.