title: Symmetry analysis of transport properties in helical superconductor junctions.
abstract: We study the discrete symmetries satisfied by helical p-wave superconductors with the d-vectors [Formula: see text] or [Formula: see text] and the transformations brought by symmetry operations to ferromagnet and spin-singlet superconductors, which show intimate associations with the transport properties in heterojunctions, including helical superconductors. In particular, the partial symmetries of the Hamiltonian under spin-rotation and gauge-rotation operations are responsible for the novel invariances of the conductance in tunnel junctions and the new selection rules for the lowest current and peculiar phase diagrams in Josephson junctions, which were reported recently. The symmetries of constructed free energies for Josephson junctions are also analyzed, and are consistent with the results from the Hamiltonian.
authors.affiliation: School of Science, Qingdao Technological University, Qingdao, Shandong 266520, People's Republic of China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Cheng
authors.forename: Yinhan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Kunhua
authors.initials: K
authors.lastname: Zhang
authors.forename: Biao
authors.initials: B
authors.lastname: Jin
authors.forename: Changlian
authors.initials: C
authors.lastname: Zhang