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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Agarwal V, Singh MP, Siwach PK, Fournier P, Singh HK. Charge order quenching, Griffiths phase, and magnetotransport in polycrystalline Pr0.58Ca0.42‚à{\'ıySryMnO3 thin films. phys. stat. sol. (a). 2010;207:1922-9.

Savard S, Allard J-, Bernier M, Petersen JC, Dodge JS, Fournier P, et al. Photoexcited carrier relaxation dynamics and terahertz response of photoconductive antennas made on proton bombarded GaAs materials. Journal of Applied Physics. 2010;108:124507.

Wadati H, Hawthorn DG, Regier TZ, Singh MP, Truong KD, Fournier P, et al. X-ray Absorption Studies of La2NiMnO6 and La2CoMnO6 Thin Films. CLS Activity Report 2009. 2010;1:114.

Agarwal V, Prasad R, Singh MP, Siwach PK, Srivastava A, Fournier P, et al. Evidence of substrate induced charge order quenching, insulator metal transition, and colossal magnetoresistance in polycrystalline Pr[sub 0.58]Ca[sub 0.42]MnO[sub 3] thin films. Applied Physics Letters. 2010;96:052512.

Singh MP, Truong KD, Jandl S, Fournier P. Phase formation, phonon behavior, and magnetic properties of novel ferromagnetic La[sub 3]BAlMnO[sub 9] (B = Co or Ni) triple perovskites. Journal of Applied Physics. 2010;107:09D916.

Singh MP, Truong KD, Jandl S, Fournier P. Multiferroic double perovskites: Opportunities, issues, and challenges. Journal of Applied Physics. 2010;107:09D917.

Prasad R, Singh M, Siwach P, Kaur A, Fournier P, Singh H. Effect of thickness on magnetic phase coexistence and electrical transport in Nd0.51Sr0.49MnO3 films. Applied Physics A: Materials Science & Processing. 2010;99:823-9. Abstract

Jenkins GS, Schmadel DC, Bach PL, Greene RL, Béchamp-Laganière X, Roberge G, et al. Origin of the anomalous Hall effect in the overdoped $n$ -type superconductor $ Pr2-{}x Cex Cuo4 $ : Current-vertex corrections due to antiferromagnetic fluctuations. Physical Review B. 2010;81:024508.

Armitage NP, Fournier P, Greene RL. Progress and perspectives on electron-doped cuprates. Rev. Mod. Phys.. 2010;82:2421-87.

Singh MP, Truong KD, Jandl S, Fournier P. Long-range Ni/Mn structural order in epitaxial double perovskite La[sub 2]NiMnO[sub 6] thin films. Physical Review B. 2009;79:224421.

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