Perfect Crossed Andreev Reflection in Dirac Hybrid Junctions in the Quantum Hall Regime.

  title={Perfect Crossed Andreev Reflection in Dirac Hybrid Junctions in the Quantum Hall Regime.},
  author={Song-Bo Zhang and Bj{\"o}rn Trauzettel},
  journal={Physical review letters},
  volume={122 25},
Perfect crossed Andreev reflection (CAR) is striking for high-efficiency Cooper pair splitting, which bears promising applications in quantum communication. Recent experimental advances have disclosed the way to explore CAR in Dirac fermion systems under ultrastrong magnetic fields. We develop a scattering approach to study quantum-Hall-superconductor-quantum-Hall junctions formed by a two-dimensional time-reversal symmetric Dirac semimetal. We propose two different setups of the hybrid… 

Figures from this paper

Andreev reflection in ballistic normal metal/graphene/superconductor junctions

We report the study of ballistic transport in normal metal/graphene/superconductor junctions in edge-contact geometry. While in the normal state, we have observed Fabry-P\'erot resonances suggesting

Crossed Andreev reflection in topological insulator nanowire T junctions

We numerically study crossed Andreev reflection (CAR) in a topological insulator nanowire T-junction where one lead is proximitized by a superconductor. We perform realistic simulations based on the

Super-Resonant Transport of Topological Surface States Subjected to In-Plane Magnetic Fields.

The conductance of Dirac surface states subjected to an in-plane magnetic field in the presence of a barrier potential is studied and it is found that, in the case of large barrier potentials, the surface states exhibit pronounced oscillations in the conductance when varying the magnetic field.

Crossed Andreev reflection in zigzag phosphorene nanoribbon based ferromagnet/superconductor/ferromagnet junctions

We study the crossed Andreev reflection in zigzag phosphorene nanoribbon based ferromagnet/superconductor/ferromagnet junction. Only edge states, which are entirely detached from the bulk gap,

Signatures of Jackiw-Rebbi resonance in the thermal conductance of topological Josephson junctions with magnetic islands

Josephson junctions in two-dimensional topological insulators with embedded magnetic domains can host a number of topological phases, in particular, Jackiw-Rebbi solitons and Majorana zero modes.

Ballistic Graphene Cooper Pair Splitter.

An experimental study of a Cooper pair splitter based on ballistic graphene multiterminal junctions that observes clear signatures of Cooper pair splitting in the local as well as nonlocal electronic transport measurements.

Transport properties of Majorana drumhead surface states in topological nodal-ring superconductors

We propose a topological nodal-ring superconductor (TNRSC) by inducing superconductivity on a topological nodal-ring semimetal (NRSM). Such a TNRSC can map to a one-dimensional BDI class topological

Field-Programmable Topological Array: Framework and Case-Studies.

Engineering composite materials and devices with desired topological properties is accelerating the development of topological physics and its applications. Approaches of realizing novel topological



Topological π Junctions from Crossed Andreev Reflection in the Quantum Hall Regime.

It is shown that, in the presence of spin-orbit coupling, contacting the 2DEG with a narrow strip of an s-wave superconductor produces a topological superconducting gap along the contact as a result of crossed Andreev reflection (CAR) processes across the strip.

Inter-Landau-level Andreev Reflection at the Dirac Point in a Graphene Quantum Hall State Coupled to a NbSe_{2} Superconductor.

The principal finding is the observation of an anomalous finite-temperature conductance peak located precisely at the Dirac point, providing a definitive evidence for inter-Landau-level Andreev reflection in a quantum Hall system.

Crossed Andreev effects in two-dimensional quantum Hall systems

We study the crossed Andreev effects in two-dimensional conductor/superconductor hybrid systems under a perpendicular magnetic field. Both a graphene/superconductor hybrid system and an electron

Toward Quantum Hall Effect in a Josephson Junction

Hybrid superconductor/semiconductor devices constitute a powerful platform where intriguing topological properties can be investigated. Here, we present fabrication methods and analysis of Josephson

Spin-filtered and spatially distinguishable crossed Andreev reflection in a silicene-superconductor junction

We theoretically investigate the quantum transports in a junction between a superconductor and a silicene nanoribbon, under the effect of a magnetic exchange field. We find that for a narrow

Supercurrent in the quantum Hall regime

The observation of a supercurrent in the QH regime marks an important step in the quest for exotic topological excitations, such as Majorana fermions and parafermions, which may find applications in fault-tolerant quantum computing.

Proposal for an all-electrical detection of crossed Andreev reflection in topological insulators.

A generalized wave matching method is used and it is found that for systems narrow enough so that the bulk states in the SC part couple both edges, the crossed Andreev reflection (CAR) is significant and the electron cotunneling and CAR become spatially separated.

Nonlocal superconducting correlations in graphene in the quantum Hall regime

We study Andreev processes and nonlocal transport in a three-terminal graphene-superconductor hybrid system under a quantizing perpendicular magnetic field [G.-H. Lee et al., Nat. Phys. 13, 693

Magnetic Field Tuning and Quantum Interference in a Cooper Pair Splitter.

It is demonstrated that the electrons from a Cooper pair splitter can propagate coherently after their emission from the superconductor and how a magnetic field can be used to optimize the performance of a CPS device.

Andreev reflection of helical edge modes in InAs/GaSb quantum spin Hall insulator.

We present an experimental study of S-N-S junctions, with N being a quantum spin Hall insulator made of InAs/GaSb. A front gate is used to vary the Fermi level into the minigap, where helical edge