Nonlocal signatures of hybridization between quantum dot and Andreev bound states

Pöschl, Andreas; Danilenko, Alisa; Sabonis, Deividas; Kristjuhan, Kaur; Lindemann, Tyler; Thomas, Candice; Manfra, Michael J.; Marcus, C. M.

doi:10.1103/physrevb.106.l161301

Cited by 11 publications

(2 citation statements)

References 52 publications

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“…For the 2DEG, we choose a semiconductor stack similar to the ones used in many modern experiments, e.g. [37][38][39]. Figure 1(a) display the schematic of a cross-section of a 2DEG nanowire.…”

Section: Calibration and Benchmarkmentioning

confidence: 99%

Orbital-free approach for large-scale electrostatic simulations of quantum nanoelectronics devices

Svejstrup

Maiani

Hoogdalem

et al. 2023

Semicond. Sci. Technol.

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The route to reliable quantum nanoelectronic devices hinges on precise control of the electrostatic environment. For this reason, accurate methods for electrostatic simulations are essential in the design process. The most widespread methods for this purpose are the Thomas-Fermi approximation, which provides quick approximate results, and the Schrödinger-Poisson method, which better takes into account quantum mechanical effects. The mentioned methods suffer from relevant shortcomings: the Thomas-Fermi method fails to take into account quantum confinement effects that are crucial in heterostructures, while the Schrödinger-Poisson method suffers severe scalability problems. This paper outlines the application of an orbital-free approach inspired by density functional theory. By introducing gradient terms in the kinetic energy functional, our proposed method incorporates corrections to the electronic density due to quantum confinement while it preserves the scalability of a theory that can be expressed as a functional minimization problem. This method offers a new approach to addressing large-scale electrostatic simulations of quantum nanoelectronic devices.

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Section: Calibration and Benchmarkmentioning

confidence: 99%

Orbital-free approach for large-scale electrostatic simulations of quantum nanoelectronics devices

Svejstrup

Maiani

Hoogdalem

et al. 2023

Semicond. Sci. Technol.

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show abstract

“…EC is a competing process with CAR and it should be suppressed in order to achieve CPS. Experimentally CPS has been achieved in QD devices realized in InAs and InSb nanowires [8][9][10][11][12][13], carbon nanotubes [14,15], graphene based QDs [16][17][18], and recently in 2DEGs [19]. Alongside the experimental effort, substantial theoretical work has also been devoted to the study of CPS in QD based devices [2,3,[20][21][22].…”

mentioning

confidence: 99%

Non-local Andreev reflection through Andreev molecular states in graphene Josephson junctions

et al. 2023

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We propose that a device composed of two vertically stacked monolayer graphene Josephsonjunctions can be used for Cooper pair splitting. The hybridization of the Andreev bound states ofthe two Josephson junction can facilitate non-local transport in this normal-superconductor hybridstructure, which we study by calculating the non-local differential conductance. Assuming that oneof the graphene layers is electron and the other is hole doped, we find that the non-local Andreevreflection can dominate the differential conductance of the system. Our setup does not require theprecise control of junction length, doping, or superconducting phase difference, which could be animportant advantage for experimental realization.

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Semiconductor-ferromagnet-superconductor planar heterostructures for 1D topological superconductivity

et al. 2022

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Hybrid structures of semiconducting (SM) nanowires, epitaxially grown superconductors (SC), and ferromagnetic-insulator (FI) layers have been explored experimentally and theoretically as alternative platforms for topological superconductivity at zero magnetic field. Here, we analyze a tripartite SM/FI/SC heterostructure but realized in a planar stacking geometry, where the thin FI layer acts as a spin-polarized barrier between the SM and the SC. We optimize the system’s geometrical parameters using microscopic simulations, finding the range of FI thicknesses for which the hybrid system can be tuned into the topological regime. Within this range, and thanks to the vertical confinement provided by the stacking geometry, trivial and topological phases alternate regularly as the external gate is varied, displaying a hard topological gap that can reach half of the SC one. This is a significant improvement compared to setups using hexagonal nanowires, which show erratic topological regions with typically smaller and softer gaps. Our proposal provides a magnetic field-free planar design for quasi-one-dimensional topological superconductivity with attractive properties for experimental control and scalability.

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Nonlocal signatures of hybridization between quantum dot and Andreev bound states

Cited by 11 publications

References 52 publications

Orbital-free approach for large-scale electrostatic simulations of quantum nanoelectronics devices

Orbital-free approach for large-scale electrostatic simulations of quantum nanoelectronics devices

Non-local Andreev reflection through Andreev molecular states in graphene Josephson junctions

Semiconductor-ferromagnet-superconductor planar heterostructures for 1D topological superconductivity

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