Department of Physics | Université de Sherbrooke

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Tue, 05/21/2013 - 12:30

Gabriel Poulin-Lamarre
- 12:30
- D3-2040
- To be announced
- Voir Google Calendar

Mon, 05/27/2013 - 12:30

Susanne Butz, Physikalisches Institut, Karlsruhe Institute of Technology, Karlsruhe, Germany.
- 12:30
- D3-2040
- Title: A Tunable Josephson Metamaterial
  
  Abstract: We present experimental data on a tunable magnetic metamaterial consisting of rf-SQUIDs. A metamaterial is a medium constructed of artifical elements, so- called meta-atoms, that interact in a specific way with an incoming electromagnetic wave. The size of and the distance between the individual meta-atoms is much smaller than the wavelength. Our metamaterial consists of one-dimensional arrays of 27 rf-SQUIDs, one chain placed inside each of the gaps of a coplanar waveguide. Due to the nonlinear inductance of the rf-SQUID, its resonance frequency is tunable in situ by applying a dc magnetic field. We demonstrate that this results in tunable effective parameters of our metamaterial. In order to obtain the effective magnetic permeability from the measured data, we employ a technique that uses only the complex transmission coefficient S21.
- Voir Google Calendar

Mon, 06/03/2013 - 12:30

Bhaskar Roy Bardhan, Department of Physics and Astronomy, Louisiana State University
- 12:30
- D3-2040
- To be annonced
- Voir Google Calendar

Wed, 06/05/2013 - 10:45

INTRIQ : Lilian Childress, McGill
- 10:45
- D1-2165
- Title: Spins and photons: toward quantum networks in diamond
  
  Abstract: Long-lived electronic and nuclear spin states have made nitrogen-vacancy (NV) defects in diamond a leading candidate for solid-state quantum information processing. Moreover, their coherent optical transitions open opportunities for quantum communication. This talk will consider the motivation and requirements for optically-networked quantum devices, and explore challenges and opportunities for realizing them in diamond. In particular, the resonant excitation and emission in these defect centers enables single shot spin detection as well as observation of two-photon quantum interference; these two capabilities have enabled measurement-based entanglement between remote NV centers.
- Voir Google Calendar

Mon, 06/10/2013 - 12:30

Frank Verstraete , Université de Vienne
- 12:30
- D3-2040
- To be announced
- Voir Google Calendar

Reid J-, Juneau-Fecteau A, Gordon RT, René de Cotret S, Doiron-Leyraud N, Luo XG, et al. From d-wave to s-wave pairing in the iron-pnictide superconductor (Ba,K)Fe 2As 2. Superconductor Science and Technology. 2012;25.

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Chang J, Doiron-Leyraud N, Cyr-Choinière O, Grissonnanche G, Laliberté F, Hassinger E, et al. Decrease of upper critical field with underdoping in cuprate superconductors. Nature Physics. 2012;8(10):751-6.

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Le Boeuf D, Doiron-Leyraud N, Vignolle B, Sutherland M, Ramshaw BJ, Levallois J, et al. Lifshitz critical point in the cuprate superconductor {$YBa_2Cu_3O_y$} from high-field Hall effect measurements. Physical Review B - Condensed Matter and Materials Physics. 2011;83.

Tanatar MA, Reid J-, René de Cotret S, Doiron-Leyraud N, Laliberté F, Hassinger E, et al. Isotropic three-dimensional gap in the iron arsenide superconductor LiFeAs from directional heat transport measurements. Physical Review B - Condensed Matter and Materials Physics. 2011;84.

Le Boeuf D, Doiron-Leyraud N, Vignolle B, Sutherland M, Ramshaw BJ, Levallois J, et al. Lifshitz critical point in the cuprate superconductor {YBa$_2$Cu$_3$O$_y$} from high-field Hall effect measurements. Physical Review B. 2011;83:054056.

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LeBoeuf2011fk.pdf

Laliberté F, Chang J, Doiron-Leyraud N, Hassinger E, Daou R, Rondeau M, et al. Fermi-surface reconstruction by stripe order in cuprate superconductors. Nature Communications. 2011;2.

Chang J, Doiron-Leyraud N, Laliberté F, Daou R, Le Boeuf D, Ramshaw BJ, et al. Nernst effect in the cuprate superconductor {$\rm YBa_2Cu_3O_y$}: Broken rotational and translational symmetries. Physical Review B - Condensed Matter and Materials Physics. 2011;84.

Chang J, Daou R, Proust C, Le Boeuf D, Doiron-Leyraud N, Laliberté F, et al. Nernst and seebeck coefficients of the cuprate superconductor YBa2Cu3O6.67: A Study of fermi surface reconstruction. Physical Review Letters. 2010;104.

Daou R, Chang J, Le Boeuf D, Cyr-Choinière O, Laliberté F, Doiron-Leyraud N, et al. Broken rotational symmetry in the pseudogap phase of a high-Tc superconductor. Nature. 2010;463:519-22.

Cyr-Choinière O, Daou R, Chang J, Laliberté F, Doiron-Leyraud N, Le Boeuf D, et al. Zooming on the quantum critical point in Nd-LSCO. Physica C: Superconductivity and its Applications. 2010;470:S12-S13.

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