Department of Physics | Université de Sherbrooke

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Today

Gabriel Poulin-Lamarre
- 12:30
- D3-2040
- To be announced
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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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Laverdière J, Jandl S, Fournier P. Colossal magnetoresistance of {$\rm Nd_{2/3}Sr_{1/3}MnO_3$} ultrathin films grown on charge-ordered {$\rm Nd_{1/2}Ca_{1/2}MnO_3$} manganite. Physical Review B - Condensed Matter and Materials Physics. 2011;84.

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.

Ranjith R, Kundu AK, Filippi M, Kundys B, Prellier W, Raveau B, et al. Ferromagnetism and magnetodielectric effect in insulating LaBi Mn43 Co23 O6 thin films. Applied Physics Letters. 2008;92.

Iliev MN, Hadjiev VG, Litvinchuk AP, Yen F, Wang Y-, Sun YY, et al. Multiple-order Raman scattering from rare-earth manganites: Oxygen isotope and rare-earth substitution effects. Physical Review B. 2007;75.

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.

Jandl S, Laverdière J, Mukhin AA, Ivanov VY, Balbashov AM. Raman and infrared quest for orbitons in Nd1-xSrxMnO3. Physica B: Condensed Matter. 2006;381:214-8.

Laverdière J, Jandl S, Mukhin AA, Ivanov VY, Ivanov VG, Iliev MN. Spin-phonon coupling in orthorhombic RMn O3 (R=Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Y): A Raman study. Physical Review B. 2006;73.

Laverdière J, Jandl S, Mukhin AA, Ivanov VY, Ivanov VG, Iliev MN. Erratum: Spin-phonon coupling in orthorhombic RMn O3 (R=Pr,Nd,Sm,Eu,Gd,Tb, Dy,Ho,Y): A Raman study (Physical Review B (2006) 73, (214301)). Physical Review B. 2006;74.

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