Compact SQUID Realized in a Double-Layer Graphene Heterostructure

Indolese, David I.; Karnatak, Paritosh; Kononov, A.; Delagrange, R.; Haller, R.; Wang, Lujun; Makk, Péter; Watanabe, Kenji; Taniguchi, Takashi; Schönenberger, Christian

doi:10.1021/acs.nanolett.0c02412

Cited by 15 publications

(11 citation statements)

References 47 publications

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“…For the purposes of implementing a Fu-Kane approach to generate MBSs in this system we need to introduce superconducting pairing correlations on the edge modes. We follow the conventional route of inducing superconductivity externally by contacting a conventional superconductor laterally to the encapsulated bilayer, a technique that has been extensively demonstrated [44][45][46][47] . We analyze two distinct geometries, see Fig 1 . Configuration A, Fig.…”

Section: Superconducting Proximity Effect and Majoranasmentioning

confidence: 99%

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Majorana bound states in encapsulated bilayer graphene

Peñaranda¹,

Aguado²,

Prada³

et al. 2022

Preprint

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Section: Superconducting Proximity Effect and Majoranasmentioning

confidence: 99%

“…We focus here on graphene-based approaches to MBSs. Graphene allows for exquisitely clean electronics and good superconducting proximity effect under magnetic fields [44][45][46][47] , properties that could help overcome some of the material-specific problems of Majorana nanowires. In Ref.…”

mentioning

confidence: 99%

Majorana bound states in encapsulated bilayer graphene

Peñaranda¹,

Aguado²,

Prada³

et al. 2022

Preprint

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“…For small coupling or low transmission probability the CPR is sinusoidal, whereas the CPR becomes forward-skewed for increased coupling. Due to the semiconducting properties in graphene JJs, the coupling strength and therefore the CPR skewness can be tuned with the gate voltage [20,[28][29][30][31]. To capture the non-sinusoidal behavior, we express the CPR as Fourier series [32]…”

Section: Current-phase Relationmentioning

confidence: 99%

Phase-dependent microwave response of a graphene Josephson junction

Haller,

Fülöp,

Indolese

et al. 2021

Preprint

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Gate-tunable Josephson junctions embedded in a microwave environment provide a promising platform to in-situ engineer and optimize novel superconducting quantum circuits. The key quantity for the circuit design is the phase-dependent complex admittance of the junction, which can be probed by sensing an rf SQUID with a tank circuit. Here, we investigate a graphene-based Josephson junction as a prototype gate-tunable element enclosed in a SQUID loop that is inductively coupled to a superconducting resonator operating at 3 GHz. With a concise circuit model that describes the dispersive and dissipative response of the coupled system, we extract the phase-dependent junction admittance corrected for self-screening of the SQUID loop. We decompose the admittance into the current-phase relation and the phase-dependent loss and as these quantities are dictated by the spectrum and population dynamics of the supercurrent-carrying Andreev bound states, we gain insight to the underlying microscopic transport mechanisms in the junction. We theoretically reproduce the experimental results by considering a short, diffusive junction model that takes into account the interaction between the Andreev spectrum and the electromagnetic environment, from which we deduce a lifetime of ∼ 17 ps for non-equilibrium populations.

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“…In this regard, a prominent role is played by hybrid systems where quantum Hall effect (QHE) and SC correlations coexist [61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76]. In particular, QHE edge states at filling factor ν = 1, proximitized via CAR processes, are especially promising for the field of topological quantum computation, since they are predicted to host Majorana bound states (MBSs) [77][78][79].…”

Section: Introductionmentioning

confidence: 99%

Crossed Andreev reflection in spin-polarized chiral edge states due to the Meissner effect

Galambos

Ronetti²,

Hetényi³

et al. 2022

Phys. Rev. B

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We consider a hybrid quantum Hall-superconductor system, where a superconducting finger with oblique profile is wedged into a two-dimensional electron gas in the presence of a perpendicular magnetic field, as considered by Lee et al., Nat. Phys. 13, 693 (2017). The electron gas is in the quantum Hall regime at filling factor ν = 1. Due to the Meissner effect, the perpendicular magnetic field close to the quantum Hall-superconductor boundary is distorted and gives rise to an in-plane component of the magnetic field. This component enables nonlocal crossed Andreev reflection between the spin-polarized chiral edge states running on opposite sides of the superconducting finger, thus opening a gap in the spectrum of the edge states without the need of spinorbit interaction or nontrivial magnetic textures. We compute numerically the transport properties of this setup and show that a negative resistance exists as a consequence of nonlocal Andreev processes. We also obtain numerically the zero-energy local density of states, which systematically shows peaks stable to disorder. The latter result is compatible with the emergence of Majorana bound states.

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Compact SQUID Realized in a Double-Layer Graphene Heterostructure

Cited by 15 publications

References 47 publications

Majorana bound states in encapsulated bilayer graphene

Majorana bound states in encapsulated bilayer graphene

Phase-dependent microwave response of a graphene Josephson junction

Crossed Andreev reflection in spin-polarized chiral edge states due to the Meissner effect

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