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Last name: BELLEC
First name: Matthieu
Email: Matthieu.BELLEC@univ-cotedazur.fr
Institution: UCA
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International audience
International audience
During this talk, I will present our recent results on the experimental study of the frictional/superfluid transition in a flowing fluid of light in a cavityless configuration, at room temperature. Using a biased photorefractive nonlinear crystal, our approach is to study the light flow around photoinduced obstacles and probe the transition by...
International audience
International audience
Experiments probing quasiparticles in semiconductor microcavities offer unprecedented insights into the dynamics of quantum fluids of light.
International audience
International audience
International audience
International audience
Experiments on honeycomb graphene-like structures using microwave measuring tech- niques are presented. The main feature of graphene - a linear density of states close to the Dirac point - can be observed. Edge states located at the armchair borders appear if an anisotropy is introduced in the structure. Both theoretical and experimental...
International audience
We present a microwave experimental setup emulating tight-binding systems that is now widely used in the realm of topological photonics. A thorough description of the experimental building blocks is presented, showing the advantages and the limits of this platform. Various experimental realizations are then described, ranging from the selective...
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By means of a microwave tight-binding analogue experiment of a graphene-like lattice, we observe a topological transition between a phase with a point-like band gap characteristic of massless Dirac fermions and a gapped phase. By applying a controlled anisotropy on the structure, we investigate the transition directly via density of states...
Phase singularities appear ubiquitously in wavefields, regardless of the wave equation. Such topological defects can lead to wavefront dislocations, as observed in a humongous number of classical wave experiments. Phase singularities of wave functions are also at the heart of the topological classification of the gapped phases of matter....
International audience
International audience
No description
By means of a microwave tight-binding analogue experiment of a graphene-like lattice, we observe a topological transition between a phase with a point-like band gap characteristic of massless Dirac fermions and a gapped phase. By applying a controlled anisotropy on the structure, we investigate the transition directly via density of states...
Experiments on hexagonal graphene-like structures using microwave measuring techniques are presented. The lowest transverse-electric resonance of coupled dielectric discs sandwiched between two metallic plates establishes a tight-binding configuration. The nearest-neighbor coupling approx- imation is investigated in systems with few discs....
Edge states are one important ingredient to understand transport properties of graphene nanoribbons. We study experimentally the existence and the internal structure of edge states under uniaxial strain of the three main edges: zigzag, bearded, and armchair. The experiments are performed on artificial microwave graphene flakes, where the...
We experimentally study the propagation of microwaves in an artificial honeycomb lattice made of dielectric resonators. This evanescent propagation is well described by a tight-binding model, very much like the propagation of electrons in graphene. We measure the density of states, as well as the wave function associated to each eigenfrequency....
Using an array of coupled microwave resonators arranged in a deformed honeycomb lattice, we experimentally observe the formation of pseudo-Landau levels in the whole crossover from vanishing to large pseudomagnetic field strength. This is achieved by utilizing an adaptable setup in a geometry that is compatible with the pseudo-Landau levels at...
International audience