Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines cond-mat
Date Mercredi 9 Octobre 2019
Heure 14:15
Institut IMPMC
Salle Conference Room 23-24-401, Campus Jussieu, 4, place Jussieu, 75005 Paris
Nom de l'orateur Morais Smith
Prenom de l'orateur Christiane
Addresse email de l'orateur c [dot] demoraissmith [at] uu [dot] nl
Institution de l'orateur Institute for Theoretical Physics, Utrecht University, The Netherlands
Titre Atom-by-atom engineering of electronic states of matter
Résumé Feynman's original idea of using one quantum system that can be manipulated at will to simulate the behavior of another more complex one has flourished during the last decades in the field of cold atoms. More recently, this concept started to be developed in nanophotonics and in condensed matter. In this talk, I will discuss a few recent experiments, in which 2D electron lattices were engineered on the nanoscale. The first is the Lieb lattice [1,2], and the second is a Sierpinski gasket [3], which has dimension D = 1.58. The realization of fractal lattices opens up the path to electronics in fractional dimensions. Finally, I will show how to realize topological states of matter using the same procedure. We investigate the robustness of the zero modes in a breathing Kagome lattice, which is the first experimental realization of a designed electronic higher-order topological insulator [4]. Then, we investigate the importance of the sample termination in determining the existence of topological edge modes in crystalline topological insulators. We focus on the breathing Kekule lattice, with two different types of termination [5]. In all cases, we observe an excellent agreement between the theoretical predictions and the experimental results.\\ [1] M.R. Slot, T.S. Gardenier, P.H. Jacobse, G.C.P. van Miert, S.N. Kempkes, S.J.M. Zevenhuizen, C. Morais Smith, D. Vanmaekelbergh, and I. Swart, "Experimental realisation and characterisation of an electronic Lieb lattice", Nature Physics 13, 672 (2017).\\ [2] M. R. Slot et al., "p-band engineering in artificial electronic lattices", Phys. Rev. X 9, 011009 (2019).\\ [3] S.N. Kempkes, M.R. Slot, S.E. Freeney, S.J.M. Zevenhuizen, D. Vanmaekelbergh, I. Swart, and C. Morais Smith, "Design and characterization of electronic fractals", Nature Physics 15, 127(2019).\\ [4] S.N. Kempkes, M. R. Slot, J. J. van den Broeke, P. Capiod, W. A. Benalcazar, D. Vanmaekelbergh, D. Bercioux, I. Swart, and C. Morais Smith "Robust zero-energy modes 
in an electronic higher-order topological insulator: the dimerized Kagome lattice", ArXiv: 1905.06053, to appear in Nature Materials (2019).\\ [5] S. E. Freeney, J. J. van den Broeke, A. J. J. Harsveld van der Veen, I. Swart, and C. Morais Smith, "Edge dependent topology in Kekulé lattices", submitted (2019).
Numéro de preprint arXiv 1905.06053
Fichiers attachés
  • Abstract-deMorais-2019.pdf (78789 bytes) OPEN

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