Department of Physics | Université de Sherbrooke

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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.
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Mon, 06/03/2013 - 12:30

Bhaskar Roy Bardhan, Department of Physics and Astronomy, Louisiana State University
- 12:30
- D3-2040
- To be annonced
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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.
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Mon, 06/10/2013 - 12:30

Frank Verstraete , Université de Vienne
- 12:30
- D3-2040
- To be announced
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Tue, 06/11/2013 - 00:00

Wolfgang Belzig, l'Université de Constance, Allemagne
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Sedeki A, Bergeron D, Bourbonnais C. Extended quantum criticality of low-dimensional superconductors near a spin-density-wave instability. Physical Review B - Condensed Matter and Materials Physics. 2012;85.

Poirier M, Langlois A, Bourbonnais C, Foury-Leylekian P, Moradpour A, Pouget J-. Magnetoelastic coupling in the spin-Peierls ground state of hydrogenated and deuterated (TMTTF) 2PF 6 salts. Physical Review B - Condensed Matter and Materials Physics. 2012;86.

Fuseya Y, Bourbonnais C, Miyake K. On the origin of the anomalous upper critical field in quasi-one- dimensional superconductors. EPL. 2012;100.

Auban-Senzier P, Jérome D, Doiron-Leyraud N, René de Cotret S, Sedeki A, Bourbonnais C, et al. The metallic transport of {(TMTSF) 2X} organic conductors close to the superconducting phase. Journal of Physics Condensed Matter. 2011;23.

Bourbonnais C, Sedeki A. Superconductivity and antiferromagnetism as interfering orders in organic conductors. Comptes Rendus Physique. 2011;12:532-41.

Ménard M, Bourbonnais C. Renormalization group analysis of the one-dimensional extended {Hubbard} model. Physical Review B - Condensed Matter and Materials Physics. 2011;83.

Auban-Senzier P, Jérome D, Doiron-Leyraud N, René de Cotret S, Sedeki A, Bourbonnais C, et al. The metallic transport of (TMTSF) 2X organic conductors close to the superconducting phase. Journal of Physics Condensed Matter. 2011;23.

Ménard M, Bourbonnais C. Renormalization group analysis of the one-dimensional extended Hubbard model. Physical Review B - Condensed Matter and Materials Physics. 2011;83.

Langlois A, Poirier M, Bourbonnais C, Foury-Leylekian P, Moradpour A, Pouget J-. Microwave dielectric study of spin-Peierls and charge-ordering transitions in (TMTTF )2PF6 salts. Physical Review B. 2010;81.

Doiron-Leyraud N, René de Cotret S, Sedeki A, Bourbonnais C, Taillefer L, Auban-Senzier P, et al. Linear-T scattering and pairing from antiferromagnetic fluctuations in the (TMTSF)2X organic superconductors. European Physical Journal B. 2010;78:23-36.

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