Odd-even parity dependent transport in an annular Kitaev chain

We investigate the impact of magnetic flux and the odd-even parity of lattice pointsNon electron transport in an annular Kitaev chain, with an explanation provided from the energy band perspective. Three transport mechanisms including direct transmission (DT), local Andreev reflection (LAR) and crossed Andreev reflection (CAR) are considered. In particular, the connection configuration of electrodes to different lattice sites is studied, where the case that the two electrodes connected to the sites are aligned along a diameter is called as symmetric connection and otherwise as asymmetric connections. For evenNand asymmetric connection, the vanished LAR and CAR in symmetric connection will emerge as peaks. A more prominent observation is that the symmetry of the two resonant peaks due to DT processes located atΦ=Nπ/3andΦ=2Nπ/3for symmetric connection will be broken, and the peak atΦ=Nπ/3will be largely reduced, where Φ is the magnetic flux. Moreover, the peaks aroundΦ=Nπ/3due to LAR and CAR processes grows drastically even larger than that from DT. For LAR and CAR processes, there is no peak aroundΦ=2Nπ/3and transmission due to these two processes are completely suppressed forΦ>Nπ/2. Moreover, it is found that the energy bands vary with Φ in a period ofNπand2Nπfor even or oddN. We systematically analyze the influence of weak disorder on transport and demonstrate that these parity-dependent effects are robust in the presence of disorder. We show that engineering topological domain walls where Majorana zero modes reside via spatial chemical potential modulation leads to transport signatures robust against lattice parity, in stark contrast to the parity-sensitive uniform-µregime. These behaviors reflect a complicated competition from DT, LAR and CAR processes and the parity of the lattice number in the Kitaev ring, which will be interested for the quantum device based on Kitaev chain.