Elsa Prada

Instituto de Ciencia de Materiales de Madrid

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Pablo San-José

Instituto de Ciencia de Materiales de Madrid

Ramón Aguado

Instituto de Ciencia de Materiales de Madrid

Samuel D. Escribano

Weizmann Institute of Science

Fernando Peñaranda

Instituto de Ciencia de Materiales de Madrid

A. Levy Yeyati

Universidad Autónoma de Madrid

Jorge Cayao

Uppsala University

Henning Schomerus

Lancaster University

F. Guinea

Donostia International Physics Center

Carlos Payá

Instituto de Ciencia de Materiales de Madrid

Yuval Oreg

Weizmann Institute of Science

Cooperative Institutions

Universidad Autónoma de Madrid

Delft University of Technology

Consejo Superior de Investigaciones Científicas

Instituto de Ciencia de Materiales de Madrid

Centre National de la Recherche Scientifique

QuTech

University of California, Santa Barbara

University of Copenhagen

Madrid Institute for Advanced Studies

Eindhoven University of Technology

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Absence of Majorana oscillations in finite-length full-shell hybrid nanowires

Physical review. B./Physical review. B (2024)

Carlos Payá Pablo San-José Carlos J. Sánchez Martínez Ramón Aguado Elsa Prada

10.1103/physrevb.110.115417

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From Andreev to Majorana bound states in hybrid superconductor–semiconductor nanowires

Nature Reviews Physics (2020)

Elsa Prada Pablo San-José Michiel W. A. de Moor Attila Geresdi Eduardo J. H. Lee

10.1038/s42254-020-0228-y

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From Andreev to Majorana bound states in hybrid superconductor-semiconductor nanowires

Bulletin of the American Physical Society (2021)

Elsa Prada Pablo San-José Michiel de Moor Attila Geresdi Eduardo J. H. Lee

Electronic excitations above the ground state must overcome an energy gap in superconductors with spatially-homogeneous s-wave pairing. In contrast, inhomogeneous superconductors such as those with magnetic impurities or weak links, or heterojunctions containing normal metals or quantum dots, can host subgap electronic excitations that are generically known as Andreev bound states (ABSs). With the advent of topological superconductivity, a new kind of ABS with exotic qualities, known as Majorana bound state (MBS), has been discovered. We review the main properties of ABSs and MBSs, and the state-of-the-art techniques for their detection. We focus on hybrid superconductor-semiconductor nanowires, possibly coupled to quantum dots, as one of the most flexible and promising experimental platforms. We discuss how the combined effect of spin-orbit coupling and Zeeman field in these wires triggers the transition from ABSs into MBSs. We show theoretical progress beyond minimal models in understanding experiments, including the possibility of different types of robust zero modes that may emerge without a band-topological transition. We examine the role of spatial non-locality, a special property of MBS wavefunctions that, together with non-Abelian braiding, is the key to realizing topological quantum computation.

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Graphene prêt-à-porter

Physics (2011)

Elsa Prada

Graphene, a single layer of carbon atoms, can be multiply folded in a controlled way into various types of single or periodic structures with intriguing properties.

Carbon fibers

10.1103/physics.4.51

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Premio Nobel de Física 2016: Revolución topológica en materia condensada

Revista española de física (2016)

Alberto Cortijo Elsa Prada Pablo San-José Ramón Aguado J. Fernández‐Rossier

La fisica de la materia condensada es mucho mas que una rama de la fisica: es una forma diferente de mirar al universo enraizada en el concepto de emergencia. E sta idea, propuesta por Philip W. Anderson en su famoso articulo de 1972 “More is different” [1] y desarrollada por Robert Laughlin [2], entre otros, defiende que el todo es mucho mas que la simple suma de las partes. Las propiedades de un sistema compuesto, ya sea un cristal, una proteina, o un nucleo atomico, no se pueden deducir, en la practica, de las propiedades de las piezas que los componen (atomos, aminoacidos, quarks), sino que emergen como consecuencia de la organizacion espontanea de sus constituyentes. Dichas propiedades nacen de la complejidad del conjunto y no pueden entreverse analizando los constituyentes por separado: una sinfonia de Beethoven se caracteriza por patrones que se pierden de vista al considerar las notas musicales por separado; saber tres acordes, haciendo referencia a otro premio Nobel de este ano, no te garantiza componer canciones como las de Bob Dylan.

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Multiple Andreev reflection and critical current in topological superconducting nanowire junctions

New Journal of Physics (2013)

Pablo San-José Jorge Cayao Elsa Prada Ramón Aguado

We study transport in a voltage-biased superconductor–normal–superconductor (SNS) junction made of semiconducting nanowires with strong spin–orbit coupling, as it transitions into a topological superconducting phase for increasing Zeeman field. Despite the absence of a fractional steady-state ac Josephson current in the topological phase, the dissipative multiple Andreev reflection current Idc at different junction transparencies is particularly revealing. It exhibits unique features related to topology, such as gap inversion, the formation of Majorana bound states and fermion-parity conservation. Moreover, the critical current Ic, which remarkably does not vanish at the critical point where the system becomes gapless, provides direct evidence of the topological transition.

Andreev reflection

Gapless playback

10.1088/1367-2630/15/7/075019

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Transport spectroscopy ofNSnanowire junctions with Majorana fermions

Physical Review B (2012)

Elsa Prada Pablo San-José Ramón Aguado

We investigate transport though normal-superconductor nanowire junctions in the presence of spin-orbit coupling and magnetic field. As the Zeeman field crosses the critical bulk value B_c of the topological transition, a Majorana bound state (MBS) is formed, giving rise to a sharp zero-bias anomaly (ZBA) in the tunneling differential conductance. We identify novel features beyond this picture in wires with inhomogeneous depletion, like the appearance of two MBSs inside a long depleted region for B

10.1103/physrevb.86.180503

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Citations (343)

Pseudospintronics in bilayer graphene

Pablo San-José Elsa Prada Edward McCann Henning Schomerus

Bilayer graphene

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Replicas of Andreev spectra in InSb nanowires

Bulletin of the American Physical Society (2018)

Azarin Zarassi Zhaoen Su Jen‐Feng Hsu Pablo San-José Elsa Prada

Andreev reflection

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Zero Landau Level in Folded Graphene Nanoribbons

Physical Review Letters (2010)

Elsa Prada Pablo San-José L. Brey

Graphene nanoribbons can be folded into a double layer system keeping the two layers decoupled. In the Quantum Hall regime folds behave as a new type of Hall bar edge. We show that the symmetry properties of the zero Landau level in metallic nanoribbons dictate that the zero energy edge states traversing a fold are perfectly transmitted onto the opposite layer. This result is valid irrespective of fold geometry, magnetic field strength and crystallographic orientation of the nanoribbon. Backscattering suppression on the N=0 Hall plateau is ultimately due to the orthogonality of forward and backward channels, much like in the Klein paradox.

Landau quantization

Zero (linguistics)

Zero-point energy

10.1103/physrevlett.105.106802

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Citations (64)