6533b826fe1ef96bd1285127
RESEARCH PRODUCT
Unveiling signatures of topological phases in open kitaev chains and ladders
Carmine Antonio PerroniVittorio CataudellaFrancesco RomeoAlfonso MaiellaroRoberta Citrosubject
General Chemical EngineeringNanowireMajorana fermionsFOS: Physical sciences02 engineering and technologycondensed_matter_physicsTopology01 natural sciencesArticlelcsh:ChemistrySuperconductivity (cond-mat.supr-con)Open quantum systemPosition (vector)Quantum state0103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)Topological orderGeneral Materials Science010306 general physicsquantum transportPhase diagramPhysicsSuperconductivityMajorana fermionMesoscopic physicsopen topological systemCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed Matter - Superconductivity021001 nanoscience & nanotechnologyopen topological systemslcsh:QD1-999Majorana fermions; open topological systems; quantum transport0210 nano-technologydescription
In this work, the general problem of the characterization of the topological phase of an open quantum system is addressed. In particular, we study the topological properties of Kitaev chains and ladders under the perturbing effect of a current flux injected into the system using an external normal lead and derived from it via a superconducting electrode. After discussing the topological phase diagram of the isolated systems, using a scattering technique within the Bogoliubov de Gennes formulation, we analyze the differential conductance properties of these topological devices as a function of all relevant model parameters. The relevant problem of implementing local spectroscopic measurements to characterize topological systems is also addressed by studying the system electrical response as a function of the position and the distance of the normal electrode (tip). The results show how the signatures of topological order affect the electrical response of the analyzed systems, a subset of which being robust also against the effects of a moderate amount of disorder. The analysis of the internal modes of the nanodevices demonstrates that topological protection can be lost when quantum states of an initially isolated topological system are hybridized with those of the external reservoirs. The conclusions of this work could be useful in understanding the topological phases of nanowire-based mesoscopic devices.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-06-14 |