Kavli Affiliate: Gang Su
| First 5 Authors: Wei Wang, Wei Wang, , ,
| Summary:
We investigate the impact of magnetic flux and the odd-even parity of lattice
points $N$ on 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 even $N$ and 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 at
$phi = pi/3$ and $phi = 2pi/3$ for symmetric connection will be broken, and
the peak at $phi = pi/3$ will be largely reduced, where $phi$ is the
magnetic flux per site. Moreover, the peaks around $phi = pi/3$ due to LAR
and CAR processes grows drastically even larger than that from DT. For LAR and
CAR processes, there is no peak around $phi = 2pi/3$ and transmission due to
these two processes are completely suppressed for $phi>pi/2$. Moreover, it is
found that the energy bands vary with $phi$ in a period of $pi$ and $2pi$
for even or odd $N$. 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.
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