59 research outputs found
Electric field induced localization phenomena in a ladder network with superlattice configuration: Effect of backbone environment
Electric field induced localization properties of a tight-binding ladder
network in presence of backbone sites are investigated. Based on Green's
function formalism we numerically calculate two-terminal transport together
with density of states for different arrangements of atomic sites in the ladder
and its backbone. Our results lead to a possibility of getting multiple
mobility edges which essentially plays a switching action between a completely
opaque to fully or partly conducting region upon the variation of system Fermi
energy, and thus, support in fabricating mesoscopic or DNA-based switching
devices.Comment: 9 pages, 6 figure
Transport signatures of Bogoliubov Fermi surfaces in normal metal/time-reversal symmetry broken -wave superconductor junctions
In recent times, Bogoliubov Fermi surfaces (BFSs) in superconductors (SCs)
have drawn significant attention due to a substantial population of Bogoliubov
quasiparticles (BQPs) together with Cooper pairs (CPs) in them. The BQPs as
zero energy excitations give rise to captivating and intricate charge dynamics
within the BFSs. In this theoretical study, we propose to reveal the unique
signatures of the topologically protected BFSs in a normal metal/time-reversal
symmetry (TRS) broken -wave SC, in terms of the differential conductance and
Fano factor (FF). For an isotropic -wave SC, an enhancement in zero-bias
conductance (ZBC) can be identified as a key signature of BFSs. However, for
the anisotropic SC, this feature does not replicate due to the presence of the
localized Andreev bound state (ABS) at the interface. The interplay of ABS and
BFSs gives rise to an anomalous behavior in ZBC. We explain this anomalous
behavior by analyzing the effective charge of the carriers in terms of the FF.
The simplicity of our setup based on -wave SC makes our proposal persuasive.Comment: 6+6 pages, 4+4 figures, comments welcom
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