Département de physique | Université de Sherbrooke

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Prochains séminaires

lun, 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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lun, 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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mer, 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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lun, 06/10/2013 - 12:30

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

Wolfgang Belzig, l'Université de Constance, Allemagne
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Roberge G, Charpentier S, Godin-Proulx S, Fournier P. Ramp-edge Josephson junctions made of Pr[sub 2 - x]Ce[sub x]CuO[sub 4 [plus-minus] delta ] electrodes and barriers. Journal of Applied Physics. 2011;109:073912.

Charpentier S, Roberge G, Godin-Proulx S, Béchamp-Laganière X, Truong KD, Fournier P, et al. Antiferromagnetic fluctuations and the Hall effect of electron-doped cuprates: Possibility of a quantum phase transition at underdoping. Physical Review B. 2010;81:104509.

Mansouri S, Charpentier S, Jandl S, Fournier P, Mukhin AA, Ivanov VY, et al. A micro-Raman study of a Pr0.5Ca0.5MnO3 single crystal and thinfilms. Journal of Physics Condensed Matter. 2009;21.

Roberge G, Charpentier S, Godin-Proulx S, Rauwel P, Truong KD, Fournier P. Improving the growth of electron-doped Pr2-xCexCuO4+[delta] thin films made by pulsed-laser deposition using excess CuO. Journal of Crystal Growth. 2009;311:1340-5.

Mansouri S, Charpentier S, Jandl S, Fournier P, Mukhin AA, Ivanov YV, et al. A micro-Raman study of a Pr0.5Ca0.5MnO3 single crystal and thin films. Journal of Physics: Condensed Matter. 2009;21:386004 (6pp). Abstract

Singh MP, Truong KD, Laverdière J, Charpentier S, Jandl S, Fournier P. Cationic ordering and role of A-site ion in manganese-based double perovskites. In: Proceedings of the 52nd Annual Conference on Magnetism and Magnetic Materials. Vol 103. AIP; 2008. 07E315.

Singh MP, Truong KD, Laverdière J, Charpentier S, Jandl S, Fournier P. Cationic ordering and role of A -site ion in manganese-based double perovskites. Journal of Applied Physics. 2008;103.

Singh MP, Charpentier S, Truong KD, Fournier P. Evidence of bidomain structure in double-perovskite La[sub 2]CoMnO[sub 6] thin films. Applied Physics Letters. 2007;90:211915.

Charpentier S, Gill-Comeau M, Jandl S, Fournier P. Observation of charge ordering by Raman scattering in Nd 0.5Ca0.5MnO3 thin films. Journal of Physics Condensed Matter. 2006;18:7193-202.

Charpentier S, Gill-Comeau M, Jandl S, Fournier P. Observation of charge o.dering by Raman scattering in Nd$_{0.5}$Ca$_{0.5}$MnO₃ thin films. Journal of Physics: Condensed Matter. 2006;18:7193-202.

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