Dr.
Eduardo Jian Hua Lee
(Instituto de Fisica de la Materia Condensada - Universidad Autonoma de Madrid)
19/07/2017, 15:15
Quantum Materials and Technologies (GEFES)
The interaction of a magnetic impurity and a superconductor yields localized states known as Andreev levels or Yu-Shiba-Rusinov (YSR) states. Recently, there has been a growing interest in this type of system, in a large part, due to theoretical work that suggests that Andreev levels are precursors of Majorana zero modes. Accordingly, it has been proposed that chains of such impurities could...
Prof.
Nacho Pascual
(Ikerbasque Research Professor ,CIC nanogune)
19/07/2017, 15:45
Quantum Materials and Technologies (GEFES)
Magnetic impurities inside a superconductor locally distorts superconductivity. They scatter Cooper pairs as a potential with broken time-reversal symmetry, what leads to localized bound states (usually refered as Shiba states) with subgap excitation energies. These states, first predicted by Yu, Shiba, and Rusinov [1], are identified in scanning tunneling spectra as pairs of intra-gap...
Dr.
Pablo San-Jose
(ICMM-CSIC)
19/07/2017, 16:05
Quantum Materials and Technologies (GEFES)
Majorana zero modes at the boundaries of topological superconductors are charge-neutral, an equal superposition of electrons and holes. This ideal situation is, however, hard to achieve in physical implementations, such as proximitised semiconducting nanowires of realistic length. In such systems Majorana overlaps are unavoidable and lead to their hybridisation into charged Bogoliubov...
Dr.
Elsa Prada
(Universidad Autónoma de Madrid)
19/07/2017, 16:25
Quantum Materials and Technologies (GEFES)
Robust zero bias transport anomalies in semiconducting nanowires with proximity-induced superconductivity have been convincingly demonstrated in various experiments. While these are compatible with the existence of Majorana zero modes at the ends of the nanowire, a direct proof of their non-locality and topological protection is now needed. Here we show that a quantum dot at the end of the...
Mr.
Noel Garcia
(International Iberian Nanotechnology Laboratory)
19/07/2017, 17:45
Quantum Materials and Technologies (GEFES)
In this work, we study the possibility of hydrogenated graphene based Qubits. The chemisorption of hydrogen in graphene provides a nuclear spin 1/2 as well as the localization of an electron in the vicinity of the adatom, very much like in the Qubits based on P donors in Si[1-4].
The possibility to control with atomic precision the chemisorption of hydrogen[5], along with the high tunability...
Mr.
José Carlos Abadillo-Uriel
(Instituto de Ciencia de Materiales de Madrid, CSIC)
19/07/2017, 18:05
Quantum Materials and Technologies (GEFES)
The search for electric field manipulable spin qubits has focused the attention in the recent years to high spin-orbit systems. These systems mix the spin with orbital degrees of freedom. As the orbital wavefunction is sensitive to electric fields, this mixing allows the possibility of manipulating spins entirely by electric means.
The large spin-orbit coupling in the valence band of group...
Dr.
Fernando Luis
(Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza)
19/07/2017, 18:25
Quantum Materials and Technologies (GEFES)
The field of cavity quantum electrodynamics (QED) studies the interaction of photons in resonant cavities with either natural or “artificial” atoms, such as quantum dots and superconducting qubits, having a nonlinear and discrete energy level spectrum [1]. For applications in spectroscopy and especially quantum information processing, a major goal is to maximize the coupling strength g1 of the...
