8-12 July 2019
Cité des Congrès
Europe/Paris timezone

Experimental study of Dirac cones merging in photonic Honeycomb lattices

Not scheduled
2h
Auditorium 450 (Cité des Congrès)

Auditorium 450

Cité des Congrès

5, rue de Valmy, Nantes, France Site web : https://lacite-nantes.fr/

Speaker

Bastián Real (Université de Lille - CNRS)

Description

So far, the development of micro-fabrication techniques in semiconductor materials has led to the engineering of high quality lattices of polariton microcavities. The main advantage of this system is that both the wave functions and the spectrum associated to the lattice hamiltonian can be directly measured in photoluminesce experiments[1] In this work, taking advantage of the fine control in the engineering of polariton lattices, we experimentally investigate the topological transition that takes place when graphene is uniformly strained[2]. We consider honeycomb lattices of polariton microcavities in which the hopping parameters change on the vertical direction only. This hopping control emulates the unidirectional strain in a real graphene and, consequently, modifies the band structure of the lattice leading to a topological transition. By scanning the frequencies of the luminescence light emitted by the honeycomb polariton lattices, we observe the different dispersion and diffusion features that this topological transition exhibits; such as the semi-Dirac dispersion and the vanishing of the so-called bearded edge state. The engineering of more elaborate strain patterns, or the application of strain to orbital bands appear as a very promising way to explore novel kinds of Dirac cones and band crossings[3].

[1] M. Milicevic et al. Phys. Rev. Lett. 118, 107403 (2017)
[2] G. Montamboux et al. Phys. Rev. B 80, 153412 (2009)
[3] M. Milicevic et al. arXiv: 1807.08650.

Choix de session parallèle 2.3 Fluides quantiques et lumière

Primary authors

Bastián Real (Université de Lille - CNRS) Dr Omar Jamadi (Université de Lille - CNRS) Marijana Milecevic (Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Universite Paris-Saclay, C2N - Marcoussis) Dr Giles Montamboux (Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Universite Paris-Saclay) Dr Tomoki Ozawa (Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS)) Isabelle Sagnes (Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Universite Paris-Saclay, C2N - Marcoussis) Dr A Lamaître (Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Universite Paris-Saclay, C2N - Marcoussis) Dr Loic Le Gratiet (Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Universite Paris-Saclay, C2N - Marcoussis) Dr A Harouri (Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Universite Paris-Saclay, C2N - Marcoussis) Dr Jacqueline Bloch (Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Universite Paris-Saclay, C2N - Marcoussis) Dr Alberto Amo (Université de Lille - CNRS)

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