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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Denoyer A, Lévesque Y, Jandl S, Guillot-Noël O, Goldner P, Viana B, et al. Crystal field study of ytterbium doped Lu2SiO5 and Y2SiO5 under a magnetic field. Journal of Physics Condensed Matter. 2008;20.

Denoyer A, Lévesque Y, Jandl S, Goldner P, Guillot-Noël O, Viana B, et al. Cooperative emission study in ytterbium-doped Y2SiO5. Journal of Luminescence. 2008;128:1389-93.

Denoyer A, Jandl S, Viana B, Guillot-Noël O, Goldner P, Pelenc D, et al. Optical properties of Yb-doped Y2SiO5 thin films. Optical Materials. 2007;30:416-22.

Denoyer A, Jandl S, Viana B, Guillot-Noël O, Goldner P, Pelenc D, et al. Infrared and Raman comparative study of Yb-doped y2SiO 5 thin films and single crystals. In: Proceedings of SPIE - The International Society for Optical Engineering. Vol 6190.; 2006.

Campos S, Petit J, Viana B, Jandl S, Vivien D, Ferrand B. {Spectroscopic investigation of the laser materials Yb3+:RE 2SiO5}. In: Proceedings of SPIE - The International Society for Optical Engineering. Vol 5460.; 2004. p. 335-43.

Campos S, Denoyer A, Jandl S, Viana B, Vivien D, Loiseau P, et al. Spectroscopic studies of Yb3+-doped rare earth orthosilicate crystals. Journal of Physics Condensed Matter. 2004;16:4579-90.

Guillot-Noël O, Menta V, Viana B, Gourier D, Boukhris M, Jandl S. Evidence of ferromagnetically coupled Nd3+ ion pairs in weakly doped Nd:LiYF4 and Nd:YVO4 crystals as revealed by high-resolution optical and EPR spectroscopies. Physical Review B. 2000;61:15338-46.

Martel JF, Jandl S, Viana B, Vivien D. Crystal-field study of Sm3+ ions in Sm2O3, Sm3+:Gd2O3 and Sm3+:Y2O3. Journal of Physics and Chemistry of Solids. 2000;61:1455-63.

Guillot-Noël O, Viana B, Bellamy B, Gourier D, Zogo-Mboulou GB, Jandl S. Spectroscopic evidence of inhomogeneous distribution of Nd3+ in YVO4, YPO4 and YAsO4 crystals. Optical Materials. 2000;13:427-37.

Martel J-, Jandl S, Lejus AM, Viana B, Vivien D. Optical crystal field study of Sm2O3 (C- and B-type). Journal of Alloys and Compounds. 1998;275-277:353-5.

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