Long range coherent magnetic bound states in superconductors

Ménard, G.C.; Guissart, S.; Brun, C.; Pons, S.; S, S.V.; Debontridder, F.; V, L.M.; Janod, E.; Cario, L.; Roditchev, D.; Simon, P.; Cren, T.

Авторы: Ménard Gerbold C., Sébastien Guissart, Christophe Brun, Stéphane Pons, Stolyarov Vasily S., François Debontridder, Leclerc Matthieu V., Etienne Janod, Laurent Cario, Dimitri Roditchev, Pascal Simon, Tristan Cren
Сборник: Superstripes 2016
Серия: Science Series
Том: 8
Тезисы
Год издания: 2016
Место издания: Superstripes Press Rome, Italy
Первая страница: 218
Последняя страница: 219
Аннотация: Individual local magnetic moments act destructively on Cooper pairs, leading to discrete spin-polarized states inside the superconducting energy gap as predicted by Yu, Shiba and Rusinov (YSR) [1,2,3]. Rusinov suggested that around magnetic atoms the decaying YSR wavefunction should have a spatially oscillating structure. We will show that in superconductors with a two-dimensional electronic band structure the YSR bound states indeed give rise to long range coherent magnetic quantum state [4]. We experimentally evidence coherent bound states with spatially oscillating particlehole asymmetry extending tens of nanometers from individual iron atoms embedded in a 2H-NbSe2 crystal and in Pb/Si(111) monolayers (see Figure 1). We theoretically elucidate how reduced dimensionality enhances the spatial extent of these bound states and describe their energy and spatial structure. These spatially extended magnetic states could be used as building blocks for coupling coherently distant magnetic atoms in new topological superconducting phases. Recently a new type of electronic excitations being their own antiparticles were predicted to appear at the edges of a hybrid system constituted of a chain of magnetic atoms coupled to a superconductor [5]. These so-called Majorana end-states were claimed to have been observed in the case of chains of iron atoms on Pb (110) [6], however their spatial extent is restricted to a few atomic distances, making difficult to handle them for braiding. Enhancing the spatial extent of YSR bound states would facilitate the remote coupling of magnetic systems through a superconducting state, opening the route towards an easier manipulation of Majorana quasiparticles and the creation of new topological quantum devices.
Добавил в систему: Столяров Василий Сергеевич

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Long range coherent magnetic bound states in superconductorsтезисы доклада

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