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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Prasad R, Singh MP, Siwach PK, Fournier P, Singh HK. Anomalous insulator-metal transition and weak ferromagnetism in Nd0.37Sr0.63MnO3 thin films. EPL (Europhysics Letters). 2008;84:27003 (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. Journal of Applied Physics. 2008;103.

Côté G, Poirier M, Fournier P. Complex microwave conductivity of Pr1.85Ce 0.15CuO4-δ thin films using a cavity perturbation method. Journal of Applied Physics. 2008;104.

Li SY, Bonnemaison J-, Payeur A, Fournier P, Wang CH, Chen XH, et al. Low-temperature phonon thermal conductivity of single-crystalline Nd[sub 2]CuO[sub 4]: Effects of sample size and surface roughness. Physical Review B. 2008;77:134501.

Richard P, Neupane M, Xu Y-, Fournier P, Li S, Dai P, et al. Emergence of the nodal portion of the Fermi surface due to the reduction process in the electron-doped cuprates. Physica B: Condensed Matter. 2008;403:1170-2.

Singh MP, Truong KD, Fournier P, Rauwel P, Rauwel E, Carignan LP, et al. Anomalously large ferromagnetic Curie temperature of epitaxial Bi[sub 2]CoMnO[sub 6] thin films. Applied Physics Letters. 2008;92:112505.

Li SY, Bonnemaison J-, Payeur A, Fournier P, Wang CH, Chen XH, et al. Low-temperature phonon thermal conductivity of single-crystalline Nd2 Cu O4: Effects of sample size and surface roughness. Physical Review B. 2008;77.

Richard P, Neupane M, Xu Y-, Fournier P, Li S, Dai P, et al. Competition between Antiferromagnetism and Superconductivity in the Electron-Doped Cuprates Triggered by Oxygen Reduction. Physical Review Letters. 2007;99:157002.

Truong KD, Laverdière J, Singh MP, Jandl S, Fournier P. Impact of Co Mn cation ordering on phonon anomalies in La2 CoMn O6 double perovskites: Raman spectroscopy. Physical Review B. 2007;76.

Truong KD, Laverdière J, Singh MP, Jandl S, Fournier P. Impact of Co/Mn cation ordering on phonon anomalies in La[sub 2]CoMnO[sub 6] double perovskites: Raman spectroscopy. Physical Review B. 2007;76:132413.

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