26ème Congrès Général de la SFP

Session

Mini-colloques: MC21 Matériaux quantiques : des prédictions à l'observation

5 juil. 2023, 14:00

Centre des Congrès de la Villette (Cité des sciences et de l'Industrie, Paris)

221. Experimental Signatures of Higher Order Topology

Richard DEBLOCK (Université Paris Saclay et CNRS, Laboratoire de Physique des Solides, Paris-Saclay, 91405 Orsay)

05/07/2023 14:00

MC21 Matériaux quantiques : des prédictions à l'observation

Contribution orale

In second-order topological insulators (SOTIs), the bulk and surfaces are insulating, while the edges or hinges conduct current in a quasi-ideal (ballistic) manner, insensitive to disorder. As in the case of quantum spin Hall edges of 2D topological insulators, the current should be transported without dissipation by counter-propagating ballistic helical states with spin orientation locked to...

366. From black hole's atmosphere to thermal quenches : probing the gravitational anomaly in quantum materials

David Carpentier (CNRS - ENS de Lyon)

05/07/2023 14:30

MC21 Matériaux quantiques : des prédictions à l'observation

Contribution orale

Einstein famously argued that energy has mass, which distorts spacetime. Conversely, as spacetime distorts, the energy density varies. This classical phenomenon applies even to massless particles: their thermal energy must vary in an inhomogeneous spacetime. The latter observation underlies an equivalence between a slowly varying temperature profile and a weakly curved spacetime. This...

32. Disentangling lattice and electronic instabilities in the excitonic insulator candidate Ta_2NiSe_5 by nonequilibrium spectroscopy

Yann Gallais (Université Paris Cité)

05/07/2023 14:45

MC21 Matériaux quantiques : des prédictions à l'observation

Contribution orale

Ta2NiSe5 (TNS) is an excitonic insulator candidate showing the semiconductor/semimetal-to-insulator (SI) transition below Tc=326 K. However, since a structural transition accompanies the SI transition, deciphering the role of electronic and lattice degrees of freedom in driving the SI transition has remained controversial. Here, I will present an investigation of the photoexcited...

242. Investigating Kitaev physics in Co honeycomb lattice materials

Manila SONGVILAY (Institut Néel - CNRS & UGA)

05/07/2023 15:00

MC21 Matériaux quantiques : des prédictions à l'observation

Contribution orale

The recent Kitaev model (2006) provides an exact model to achieve a quantum spin liquid ground state in a 2D honeycomb lattice system through Ising-like bond- dependent interactions [1]. While first considered as a toy model, a theoretical work from Jackeli and Khaliullin has paved the way towards the realization of Kitaev physics in bulk materials. They first showed that bond-dependent...

166. Using phonons to decipher weak symmetry breaking in multiferroics

Marie-Bernadette LEPETIT (Institut Néel CNRS)

05/07/2023 15:30

MC21 Matériaux quantiques : des prédictions à l'observation

Contribution orale

Strongly correlated systems are characterized by the fact that their low energy properties are not driven by the delocalization resulting from their kinetic energy, but by the effect of Coulomb’s repulsion between electrons. As a result they usually exhibit various ground-states that can be triggered using external conditions such as temperature, electric or magnetic fields, pressure,...

158. Solid State Neuroscience

Dr Marcelo Rozenberg (LPS Orsay, CNRS - Université Paris Saclay)

05/07/2023 15:45

MC21 Matériaux quantiques : des prédictions à l'observation

Contribution orale

In this talk I shall introduce some basic notions of electronic neuromorphic
functionalities of materials and devices.
I shall first briefly describe our efforts towards implementing artificial neurons
exploiting the electric Mott transition. Then, I shall describe in more detail
our recent work implementing a new silicon-based memristive neuron. This
artificial spiking neuron is...

180. Topological amorphous solids: from flat-bands to chiral spin liquids

Adolfo G. GRUSHIN (Institut Néel, CNRS)

07/07/2023 08:30

MC21 Matériaux quantiques : des prédictions à l'observation

Contribution orale

Topological materials are often predicted using crystal symmetries, although they don’t rely on them to exist. Our methodology thus excludes all amorphous materials, which are ubiquitous in technology and can display properties beyond those of crystals. In this talk I will present recent theoretical progress and experimental signatures of amorphous topological solids. I will discuss how to...

217. Spin-polarized Majorana zero modes in penta-silicene nanoribbons

Guy LE LAY (PIIM - CNRS Aix-Marseille Université)

07/07/2023 09:00

MC21 Matériaux quantiques : des prédictions à l'observation

Contribution orale

We report the possibility of obtaining Majorana zero modes (MZMs) in straight, highly perfect, and massively aligned atom-thin penta-silicene nanoribbons (p-SiNRs) with a very high aspect ratio, purely composed of silicon pentagonal building blocks, and grown by molecular beam epitaxy on the (110) surface a silver crystal template2,3. They could constitute the experimental realization of the...

381. Hidden magnetic texture in the pseudogap phase of high-Tc superconducting YBa2Cu3O6+x

Dalila Bounoua (Laboratoire Léon Brillouin, CEA-Saclay)

07/07/2023 09:15

MC21 Matériaux quantiques : des prédictions à l'observation

Contribution orale

Despite decades of intense researches, the enigmatic pseudo-gap (PG) phase of superconducting cuprates remains an unsolved mystery. In the last 15 years, condensed matter physicists discovered that this phase hosts symmetry breaking states as an intra-unit cell (or q=0) magnetism, interpreted in terms of loop current patterns [1], preserving lattice translation (LT) and breaking time-reversal...

289. Twisted bilayer and trilayer graphene

Christophe Mora

07/07/2023 09:30

MC21 Matériaux quantiques : des prédictions à l'observation

Contribution orale

The overlay of graphene monolayers with a relative twist has experimentally led to a plethora of correlated physics: superconductivity, correlated insulating phases, nematicity, integer and fractional Chern insulators, spontaneous flavor and magnetic polarization, orbital ferromagnetism or strange-metal behavior. All these phenomena originate from the strong band structure remodeling due to...

312. Microwave properties of superconducting 2D BSCCO-2212

Zoe Velluire (LPEM, ESPCI)

07/07/2023 10:00

MC21 Matériaux quantiques : des prédictions à l'observation

Contribution orale

Two-dimensional superconductors confront physicists with new challenges by exhibiting a wide variety of unconventional behaviors not captured by the BCS theory. In particular, two-dimensional superconductors are expected to show signs of the Berezinksi-Kosterlitz-Thouless transition (BKT) in their superconducting properties such as resistivity and superfluid stiffness. The cuprate family...

210. Misfit layer compounds as ultra-tunable field effect transistors: from charge transfer control to emergent superconductivity

Ludovica Zullo (Sorbonne Université and Università degli studi di Trento)

07/07/2023 10:15

MC21 Matériaux quantiques : des prédictions à l'observation

Contribution orale

Misfit layer compounds are heterostructures composed of bilayer rocksalts stacked with few layers transition metal dichalcogenides. They host Ising superconductivity, charge density waves and good thermoelectricity. The design of misfits emergent properties is, however, hindered by the lack of a global understanding of the electronic transfer among the constituents. Here, by performing first...