Title: Probing the topological character of superconductors via nonlocal Hanbury Brown and Twiss correlations

Abstract: Superconductors can be classified as topological or not based on whether time-reversal symmetry, chiral symmetry, particle-hole symmetry, and spin rotation symmetry in two-dimensional are preserved or not as per ten-fold classification. Further, topological superconductors can also be classified as gapful (chiral, helical) or nodal. Hanbury Brown and Twiss (HBT) correlations and the nonlocal conductance, can be use to probe metal and two-dimensional unconventional superconductors and metal junctions to understand better the pairing of unconventional superconductors. HBT correlations are asymmetric as a function of bias voltage for nontopological, whereas they are symmetric for topological superconductors irrespective of the barrier strength. Topological superconductors are associated with Majorana fermions which are important for topological quantum computation. By distinguishing topological from nontopological superconductors, our study will help search for Majorana fermions, which will aid in designing a topological quantum computer.