Crossed Andreev effects in two-dimensional quantum Hall systems

Hou, Zhe; Xing, Yanxia; Guo, Aimin; Sun, Qing-Feng

doi:10.1103/physrevb.94.064516

Cited by 47 publications

(25 citation statements)

References 60 publications

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“…In the recent past, it has become possible to investigate such transport problems not only between identical ballistic chiral QH states but also between distinct systems, such as QH edge states and superconductors, both theoretically [61][62][63][64][65][66][67][68][69][70] and experimentally [19,20,22,[71][72][73][74]. This line of research is particularly relevant for the creation of parafermion bound states, non-Abelian quasiparticles with potential application in topological quantum computation [75][76][77][78][79][80][81][82][83][84].…”

Section: Introductionmentioning

confidence: 99%

Current correlations of Cooper-pair tunneling into a quantum Hall system

2020

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We study Cooper-pair transport through a quantum point contact between a superconductor and a quantum Hall edge state at integer and fractional filling factors. We calculate the tunneling current and its finite-frequency noise to the leading order in the tunneling amplitude for dc and ac bias voltage in the limit of low temperatures. At zero temperature and in the case of tunneling into a single edge channel both the conductance and differential shot noise vanish as a result of the Pauli exclusion principle. In contrast, in the presence of two edge channels, this Pauli blockade is softened and a nonzero conductance and shot noise are revealed.

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Section: Introductionmentioning

confidence: 99%

Current correlations of Cooper-pair tunneling into a quantum Hall system

2020

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“…near the charge neutrality point. This exotic effect could potentially be used to detect valley polarization 16 or in spin filters 17 , while Andreev conversion effects may persist in the quantum Hall regime [18][19][20][21] . Noticeably, an NS interface coupled to a one-dimensional system with strong spin-orbit coupling is expected to host Majorana bound states 22 .…”

Section: Introductionmentioning

confidence: 99%

Andreev reflection in ballistic normal metal/graphene/superconductor junctions

et al. 2019

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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-Pérot resonances suggesting that charge carriers travel ballistically, the superconducting state shows that the Andreev reflection at the graphene/superconductor interface is affected by these interferences. Our experimental results in the superconducting state have been analyzed and explained with a modified Octavio-Tinkham-Blonder-Klapwijk model taking into account the magnetic pair-breaking effects and the two different interface transparencies, i.e. between the normal metal and graphene, and between graphene and the superconductor. We show that the transparency of the normal metal/graphene interface strongly varies with doping at large scale, while it undergoes weaker changes at the graphene/superconductor interface. When a cavity is formed by the charge transfer occurring in the vicinity of the contacts, we see that the transmission probabilities follow the normal state conductance highlighting the interplay between the Andreev processes and the electronic interferometer.

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“…With the improvements in device fabrication techniques [33,34], high quality graphene based superconducting devices have been realized [35][36][37][38][39][40][41]. Nonlocal Andreev processes were experimentally demonstrated in the encapsulated graphene system by exploiting the chiral nature of the edge states in the quantum Hall regime [42][43][44][45]. Recently, CPS has been demonstrated in a vertical double bilayer graphene system [46].…”

mentioning

confidence: 99%

A Ballistic Graphene Cooper Pair Splitter

Pandey,

Danneau,

Beckmann

2020

Preprint

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We report an experimental study of Cooper pair splitting in an encapsulated graphene based multiterminal junction in the ballistic transport regime. Our device consists of two transverse junctions, namely the superconductor/graphene/superconductor and the normal metal/graphene/normal metal junctions. In this case, the electronic transport through one junction can be tuned by an applied bias along the other. We observe clear signatures of Cooper pair splitting in the local as well as nonlocal electronic transport measurements. Our experimental data can be very well described by using a modified Octavio-Tinkham-Blonder-Klapwijk model and a three-terminal beam splitter model.

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Crossed Andreev effects in two-dimensional quantum Hall systems

Cited by 47 publications

References 60 publications

Current correlations of Cooper-pair tunneling into a quantum Hall system

Current correlations of Cooper-pair tunneling into a quantum Hall system

Andreev reflection in ballistic normal metal/graphene/superconductor junctions

A Ballistic Graphene Cooper Pair Splitter

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