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You searched for subject:(Yu Shiba Rusinov). Showing records 1 – 3 of 3 total matches.

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1. Ménard, Gerbold, Christophe, Bertrand. 2D superconductors perturbed by local magnetism : from Yu-Shiba-Rusinov bound states to Majorana quasiparticles : Supraconducteurs 2D perturbés par un magnétisme local : des états de Yu-Shiba-Rusinov aux quasiparticules de Majorana.

Degree: Docteur es, Physique, 2016, Université Pierre et Marie Curie – Paris VI

L'un des buts de la physique de la matière condensée est à l'heure actuelle de fournir de nouveaux systèmes topologiques en particulier dans le domaine de la supraconductivité. L'une des manières envisagée pour générer des supraconducteurs topologiques est d'utiliser une interaction magnétique locale sous la forme de chaînes d'impuretés magnétiques, de vortex ou de clusters d'impuretés magnétiques ordonnées. Dans cette thèse nous avons étudié un ensemble d'effets en partant de l'étude d'impuretés individuelles en allant jusqu'aux clusters organisés en interaction avec un supraconducteur bidimensionnel. En utilisant la microscopie et la spectroscopie tunnel nous avons étudié des monocrystaux de 2H-NbSe2 ainsi que les monocouches de Pb/Si(111). En raison du caractère électronique bi-dimensionnel de ces deux systèmes nous avons pu montrer que l'étendue spatiale des états liés induits par des impuretés magnétiques était considérablement augmentée en comparaison avec les supraconducteurs tridimensionnels. En combinant ces atomes magnétiques par auto-assemblage nous sommes parvenus à réaliser des clusters ferromagnétiques qui génèrent une supraconductivité topologique dans la monocouche de Pb. Nous présentons en particulier ici la mesure d'états de bords topologiques à l'interface entre Pb/Si(111) et Pb/Co/Si(111). Nous présentons également la mesure d'états liés à zéro énergie au centre de clusters magnétiques signant la présence de fermions de Majorana dans ces systèmes.

One of the present days goals of condensed matter physics is to create new systems with topological properties, especially in the field of superconductivity. One of the ways envisioned to create topological superconductors is to locally induce a magnetic interaction in the form of chains of magnetic impurities, vortices or magnetic clusters of ordered magnetic impurities. In this thesis we studied a set of effects from individual impurities to organized clusters interacting with two-dimensional superconductors. Using scanning tunneling microscopy and spectroscopy we considered two systems, monocrystals of 2H-NbSe2 and monolayers of Pb/Si(111). Thanks to the two-dimensional electronic behavior of these two systems we show how the spatial extent of the bound states induced by magnetic impurities is considerably enhanced compared to the case of a three-dimensional superconductor. By combining these magnetic atoms using a self-assembly method we were able to create ferromagnetic clusters that lead to a topological superconductivity in Pb monolayers. In particular we present here measurement of topological edge states at the interface Pb/Si(111) and Pb/Co/Si(111). We also present the measurement of zero bias peaks in the center of larger magnetic clusters that sign the presence of Majorana fermions in these systems. Our results show that an adequate patterning of surfaces could realize topological patches and call for a pursuit of the efforts in the subject in order to be able to control Majorana fermions that could eventually lead to…

Advisors/Committee Members: Roditchev, Dimitri (thesis director), Cren, Tristan (thesis director).

Subjects/Keywords: Supraconductivité; STM; Topologie; Pb/Si(111); Yu-Shiba-Rusinov; Interaction Rashba spin orbite; NbSe2; Magnétisme local; Superconductivity; Topology; Yu-Shiba-Rusinov; 530

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APA (6th Edition):

Ménard, Gerbold, Christophe, B. (2016). 2D superconductors perturbed by local magnetism : from Yu-Shiba-Rusinov bound states to Majorana quasiparticles : Supraconducteurs 2D perturbés par un magnétisme local : des états de Yu-Shiba-Rusinov aux quasiparticules de Majorana. (Doctoral Dissertation). Université Pierre et Marie Curie – Paris VI. Retrieved from http://www.theses.fr/2016PA066222

Chicago Manual of Style (16th Edition):

Ménard, Gerbold, Christophe, Bertrand. “2D superconductors perturbed by local magnetism : from Yu-Shiba-Rusinov bound states to Majorana quasiparticles : Supraconducteurs 2D perturbés par un magnétisme local : des états de Yu-Shiba-Rusinov aux quasiparticules de Majorana.” 2016. Doctoral Dissertation, Université Pierre et Marie Curie – Paris VI. Accessed October 17, 2019. http://www.theses.fr/2016PA066222.

MLA Handbook (7th Edition):

Ménard, Gerbold, Christophe, Bertrand. “2D superconductors perturbed by local magnetism : from Yu-Shiba-Rusinov bound states to Majorana quasiparticles : Supraconducteurs 2D perturbés par un magnétisme local : des états de Yu-Shiba-Rusinov aux quasiparticules de Majorana.” 2016. Web. 17 Oct 2019.

Vancouver:

Ménard, Gerbold, Christophe B. 2D superconductors perturbed by local magnetism : from Yu-Shiba-Rusinov bound states to Majorana quasiparticles : Supraconducteurs 2D perturbés par un magnétisme local : des états de Yu-Shiba-Rusinov aux quasiparticules de Majorana. [Internet] [Doctoral dissertation]. Université Pierre et Marie Curie – Paris VI; 2016. [cited 2019 Oct 17]. Available from: http://www.theses.fr/2016PA066222.

Council of Science Editors:

Ménard, Gerbold, Christophe B. 2D superconductors perturbed by local magnetism : from Yu-Shiba-Rusinov bound states to Majorana quasiparticles : Supraconducteurs 2D perturbés par un magnétisme local : des états de Yu-Shiba-Rusinov aux quasiparticules de Majorana. [Doctoral Dissertation]. Université Pierre et Marie Curie – Paris VI; 2016. Available from: http://www.theses.fr/2016PA066222


University of Lund

2. Deng, Mingtang. Charge Transport in Semiconductor Nanowire Quantum Devices: From Single Quantum Dots to Topological Superconductors.

Degree: 2013, University of Lund

This thesis focuses on charge transport in semiconductor InSb nanowire quantum devices, including the electron transport, the hole transport, and the Cooper pair transport. Devices in which InSb semiconductor nanowire quantum dots are coupled with normal metals, superconductors or the proximity effect induced topological superconductors are fabricated and measured. Firstly, we have fabricated and measured normal metal contacted InSb nanowire devices. In each of these devices, a quantum dot is formed in the InSb nanowire between the contacts. We report on the magnetotransport measurements performed to these quantum dot devices, and reveal several novel transport features. First, we demonstrate the ambipolar quantum dot devices in which the quantum dots can be tuned from the n-type regime to the p-type regime. The transport measurements in both of the n-type regime and the p-type regime are performed. We also show that two methods can be used to estimate the effective g-factor of the quantum dot, but they can give very different estimation in the presence of a Kondo effect. In the p-type regime of an ambipolar quantum dot, we observe conductance peaks in the stability diagram which can be attributed to the quasi-1D lead states. Secondly, we have fabricated and characterized the superconductor coupled InSb nanowire quantum dots. We probe the density of states of the quasi-particles in the superconductor contacts, via a weakly coupled InSb quantum dot. In the strongly coupled InSb nanowire-superconductor junctions, dissipationless Josephson currents are observed. A SQUIDS device is also fabricated and measured, in which an anomalous modulation of the Josephson current in the magnetic field is observed. In the medium coupling regime, we observe the signatures of the multiple Andreev reflections, the sub-gab bound states, and the Josephson current, interplaying with the Kondo effect. By adjusting the gate voltages, we can control the dot-lead coupling strength and asymmetry. Here, we report the quantum phase transition induced by tuning the dot-lead coupling and the quantum phase transition induced by a magnetic field. We have also found the coupling asymmetry is very important for the observation of the Josephson current. In the magnetic field, the evolution of the Kondo effect enhanced Josephson current is found to be strongly dependent on the energy ratio of Kondo energy and superconducting gap. Finally, an anomalous low-field suppression of the zero-bias conductance peak in the Kondo regime is observed. In the last part of the thesis, we report on our efforts to search for Majorana fermions in solid state systems. Nb-InSb nanowire quantum dot-Nb hybrid devices were fabricated and the transport measurements were performed at low temperatures for these devices. We have observed anomalous zero-bias conductance peaks emerging in finite magnetic fields in the Nb-InSb nanowire quantum dot-Nb hybrid devices as a signature of the Majorana bound states in such hybrid devices. We have also found that the zero-bias conductance…

Subjects/Keywords: Den kondenserade materiens fysik; Multiple Andreev reflection; SQUID; Proximity effect; the Josephson effect; Cooper pair; the Kondo effect; the Zeeman effect; Quantum dot; InSb; Nanowires; Transport; Fysicumarkivet A:2013:Deng; Majorana bound state; Yu-Shiba-Rusinov state; Andreev bound state

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APA (6th Edition):

Deng, M. (2013). Charge Transport in Semiconductor Nanowire Quantum Devices: From Single Quantum Dots to Topological Superconductors. (Doctoral Dissertation). University of Lund. Retrieved from http://lup.lub.lu.se/record/4024868 ; http://portal.research.lu.se/ws/files/6267623/4024941.pdf

Chicago Manual of Style (16th Edition):

Deng, Mingtang. “Charge Transport in Semiconductor Nanowire Quantum Devices: From Single Quantum Dots to Topological Superconductors.” 2013. Doctoral Dissertation, University of Lund. Accessed October 17, 2019. http://lup.lub.lu.se/record/4024868 ; http://portal.research.lu.se/ws/files/6267623/4024941.pdf.

MLA Handbook (7th Edition):

Deng, Mingtang. “Charge Transport in Semiconductor Nanowire Quantum Devices: From Single Quantum Dots to Topological Superconductors.” 2013. Web. 17 Oct 2019.

Vancouver:

Deng M. Charge Transport in Semiconductor Nanowire Quantum Devices: From Single Quantum Dots to Topological Superconductors. [Internet] [Doctoral dissertation]. University of Lund; 2013. [cited 2019 Oct 17]. Available from: http://lup.lub.lu.se/record/4024868 ; http://portal.research.lu.se/ws/files/6267623/4024941.pdf.

Council of Science Editors:

Deng M. Charge Transport in Semiconductor Nanowire Quantum Devices: From Single Quantum Dots to Topological Superconductors. [Doctoral Dissertation]. University of Lund; 2013. Available from: http://lup.lub.lu.se/record/4024868 ; http://portal.research.lu.se/ws/files/6267623/4024941.pdf


Delft University of Technology

3. Island, J.O. Quantum transport in superconducting hybrids: Molecular devices and layered materials.

Degree: 2016, Delft University of Technology

In this thesis we investigate superconducting hybrids made from two material systems, namely, molecules and layered materials. For studies of superconducting phenomena in molecular junctions we develop two platforms which rely on the superconducting proximity effect to preserve pre-existing nano-gap formation techniques and bonding chemistries. In the second half of this thesis we investigate the thickness dependent properties of the 2H crystal phase of two layered materials; molybdenum disulfide (2H-MoS2) and tantalum disulfide (2H-TaS2). Advisors/Committee Members: van der Zant, H.S.J..

Subjects/Keywords: Hybrid devices; quantum dots; two-dimensional materials; layered materials; few-layer graphene break-junctions; Yu-Shiba-Rusinov states; MoS2; TaS2; superconductivity; Josephson junction

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APA (6th Edition):

Island, J. O. (2016). Quantum transport in superconducting hybrids: Molecular devices and layered materials. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:257795db-f94a-421e-80ab-fae7b8c17d4d ; urn:NBN:nl:ui:24-uuid:257795db-f94a-421e-80ab-fae7b8c17d4d ; 257795db-f94a-421e-80ab-fae7b8c17d4d ; 10.4233/uuid:257795db-f94a-421e-80ab-fae7b8c17d4d ; urn:isbn:978-90-8593-269-7 ; urn:NBN:nl:ui:24-uuid:257795db-f94a-421e-80ab-fae7b8c17d4d ; http://resolver.tudelft.nl/uuid:257795db-f94a-421e-80ab-fae7b8c17d4d

Chicago Manual of Style (16th Edition):

Island, J O. “Quantum transport in superconducting hybrids: Molecular devices and layered materials.” 2016. Doctoral Dissertation, Delft University of Technology. Accessed October 17, 2019. http://resolver.tudelft.nl/uuid:257795db-f94a-421e-80ab-fae7b8c17d4d ; urn:NBN:nl:ui:24-uuid:257795db-f94a-421e-80ab-fae7b8c17d4d ; 257795db-f94a-421e-80ab-fae7b8c17d4d ; 10.4233/uuid:257795db-f94a-421e-80ab-fae7b8c17d4d ; urn:isbn:978-90-8593-269-7 ; urn:NBN:nl:ui:24-uuid:257795db-f94a-421e-80ab-fae7b8c17d4d ; http://resolver.tudelft.nl/uuid:257795db-f94a-421e-80ab-fae7b8c17d4d.

MLA Handbook (7th Edition):

Island, J O. “Quantum transport in superconducting hybrids: Molecular devices and layered materials.” 2016. Web. 17 Oct 2019.

Vancouver:

Island JO. Quantum transport in superconducting hybrids: Molecular devices and layered materials. [Internet] [Doctoral dissertation]. Delft University of Technology; 2016. [cited 2019 Oct 17]. Available from: http://resolver.tudelft.nl/uuid:257795db-f94a-421e-80ab-fae7b8c17d4d ; urn:NBN:nl:ui:24-uuid:257795db-f94a-421e-80ab-fae7b8c17d4d ; 257795db-f94a-421e-80ab-fae7b8c17d4d ; 10.4233/uuid:257795db-f94a-421e-80ab-fae7b8c17d4d ; urn:isbn:978-90-8593-269-7 ; urn:NBN:nl:ui:24-uuid:257795db-f94a-421e-80ab-fae7b8c17d4d ; http://resolver.tudelft.nl/uuid:257795db-f94a-421e-80ab-fae7b8c17d4d.

Council of Science Editors:

Island JO. Quantum transport in superconducting hybrids: Molecular devices and layered materials. [Doctoral Dissertation]. Delft University of Technology; 2016. Available from: http://resolver.tudelft.nl/uuid:257795db-f94a-421e-80ab-fae7b8c17d4d ; urn:NBN:nl:ui:24-uuid:257795db-f94a-421e-80ab-fae7b8c17d4d ; 257795db-f94a-421e-80ab-fae7b8c17d4d ; 10.4233/uuid:257795db-f94a-421e-80ab-fae7b8c17d4d ; urn:isbn:978-90-8593-269-7 ; urn:NBN:nl:ui:24-uuid:257795db-f94a-421e-80ab-fae7b8c17d4d ; http://resolver.tudelft.nl/uuid:257795db-f94a-421e-80ab-fae7b8c17d4d

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