Séminaires Nanoélectronique Quantique

Retrouver tous les "Séminaires Nanoélectronique Quantique" passés et à venir dans cette rubrique.

Prochain séminaire
Rémi Desbuquois (ETH Zurich)
mardi 5 juin 2018 à 14h, dans la salle « Rémy lemaire » (K223), Institut Néel
Inscription obligatoire

"Ultracold atoms in periodically driven optical lattices : beyond the Hubbard model"

Strong periodic driving can be used to control the properties of interacting quantum systems. For example, in solid state experiments, ultrashort laser pulses are employed to tune the charge order as well as magnetic and superconducting properties of materials. This method, known as Floquet engineering, can also be used in cold atoms experiments to realize new models. In this seminar, I will present two experimental examples .of novel effective Hamiltonians.
First, I will report on the realisation of the Haldane model and the characterisation of its topological band-structure, using non-interacting ultracold fermionic atoms in a periodically modulated optical honeycomb lattice. The model is based on breaking time-reversal symmetry, which is achieved through the introduction of complex next-nearest-neighbour tunnelling terms, induced through circular modulation of the lattice position. This opens a gap in the band-structure, which is probed using momentum-resolved interband transitions. We explore the resulting Berry-curvatures of the lowest band by applying a constant force to the atoms and find orthogonal drifts analogous to a Hall current.
Second, I will discuss the influence of interparticle interactions in periodically driven optical lattices. In the high-frequency regime, the effective description of the many-body system by a renormalized tunnelling amplitude remains valid, as demonstrated by comparing our results to an equivalent static system. Furthermore, when driving at a frequency close to the interaction energy, anti-ferromagnetic correlations can be enhanced or even switched to ferromagnetic ordering.

Les Organisateurs.
M. Hocevar, B. Sacepe, R. Whitney, C. Groth

Si vous souhaitez planifier des invitations, merci de nous contacter à l’adresse suivante :

A venir
5 juin 2018
Rémi Desbuquois (ETH Zurich)



19 décembre 2017
Tailoring supercurrent confinement in graphene bilayer weak links de Romain Danneau (Karlsruhe Institute of Technology Germany)
4 décembre 2017
Photonic counterparts of Cooper pairs de Marcelo Franca Santos (Universidade Federal do Rio de Janeiro)
28 novembre 2017
Near-quantum-limited microwave amplification and nonreciprocal transmission using engineered mechanical dissipation de Alexey Feofanov (EPFL Lausanne)
14 novembre 2017
Electron Transfer between Quantum Dots de Tobias Krähenmann (ETH Zurich)
7 novembre 2017
The Josephson effect in semiconductor channels : From fundamental science to qubit applications de Attila Geresdi (QuTech & Kavli Institute of Nanoscience, Delft University of Technology)
17 octobre 2017
Superconducting microwave cavities as memories for modular quantum information processing de Wolfgang Pfaff (Yale University, USA)
10 octobre 2017
From single magnetic adatoms on superconductors to coupled spin chains
de Katharina Franke (Freie Universität Berlin)

26 septembre 2017
Revealing a quantum phase transition with a Kondo circuit de Zubair Iftikhar (SPEC, CEA)
19 septembre 2017
Tinkering with Majoranas de Anton Akhmerov (TU Delft)
11 juillet 2017
The role of electron-electron interactions in graphene de Shaffique Adam (National University of Singapore)
20 juin 2017
Charge quantum interference device on superconducting nano-wires de Oleg Astafiev (Royal Holloway, University of London)
13 juin2017
Evolving functionality in nanomaterial networks de Wilfred G. van der Wiel (University of Twente, The Netherlands)
6 juin2017
Relaxation of an Electron Spin in a Moving Quantum Dotby Xuedong Hu (Department of Physics, University at Buffalo, USA)
30 mai
Understanding and exploiting interactions between components in quantum circuits de Philippe Joyez (SPEC, CEA-Saclay)
22 mai 2017
Feedback-tuned high fidelity gates for (GaAs based) two-electron spin qubits
de Hendrik Bluhm (RWTH Aachen University, Allemagne)

16 mai 2017
Electron teleportation in multi-terminal Majorana islands : Kondo effect at high temperature de Karen Michaeli (Weizmann Institute for Science, Israel)
9 mai 2017
Superconducting Atom Chips de Rainer Dumke (Nanyang Technological University, Singapore)
4 mai 2017
Quantum Physics in One Dimension using Nanostructured Josephson-junction Arrays de Tim Duty (University of New South Wales, Sydney)
20 avril 2017
Les bits quantiques MOS de Prof. Michel Pioro-Ladrière (Professeur associé, Département de physique, Université de Sherbrooke et Directeur adjoint, Institut Quantique, Université de Sherbrooke)
11 avril 2017
Quantum microwave devices based on inelastic Cooper pair tunneling de Max Hofheinz (CEA INAC)
28 mars 2017
Spin to charge conversion at room temperature using spin orbit coupling and recently discovered topological insulators de Laurent Vila (SPINTEC)
21 mars 2017
Spin Dynamics in Out-of-Equilibrium Superconductors de Charis Quay (Laboratoires de Physique des Solides, Université Paris Sud)
14 février 2017
Quantized circular photogalvanic effect in Weyl semimetals de Adolfo Grushin (Department of Physics, UC Berkeley et Institut Néel, CNRS & UGA)
7 février 2017
Confining the state of light to a quantum manifold by engineered two-photon loss de Zaki Leghtas (Laboratoire Pierre Aigrain - Ecole Normale Supérieure)
31 janvier 2017
Many-Body Localization Basics - Recent Highlights - Experimental possibilities de Nicolas Laflorencie (Laboratoire de Physique Théorique, Toulouse)
24 janvier 2017
Fluctuation theorems in engineered environments de Marcelo F. Santos (Universidade Federal do Rio de Janeiro, Brésil)
17 janvier 2017
THz Spectroscopy on Disordered Superconductors and the “Superconducting Dome” of Granular Aluminum de Marc Scheffler (Physikalisches Institut, University of Stuttgart, Germany)
10 janvier 2017
Mesoscopic Spectroscopy with Josephson Junctions de Caglar GIRIT (Collège de France, Paris)



Séminaire Nanoélectronique Quantique : Rémi Desbuquois (ETH Zurich)

mardi 5 juin 2018 - 14h00 - Salle « Remy Lemaire » (K223)

"Ultracold atoms in periodically driven (...)

en savoir +