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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Rassau AP, Gordeev SN, De Groot PA, Gagnon R, Taillefer L. Metastability of the vortex solid in detwinned YBa2Cu3Oy. Physica B: Condensed Matter. 2000;284-288:693-4.

Gordeev SN, Zhukov AA, De Groot PA, Jansen AG, Gagnon R, Taillefer L. Oscillatory melting temperature of the vortex smectic phase in layered superconductors. Physical Review Letters. 2000;85:4594-7.

Gordeev SN, Rassau AP, Zhukov AA, De Groot PA, Jansen AG, Gagnon R, et al. Anomalous in-plane magneto-resistance of low-oxygenation YBa2Cu3Oy. Physica B: Condensed Matter. 2000;284:II/.

Gordeev SN, Rassaif AP, Zhukov AA, De Groot PA, Jansen AG, Gagnon R, et al. Anomalous in-plane magneto-resistance of low-oxygenation YBa2Cu2Oy. Physica B: Condensed Matter. 2000;284-288:642-3.

Rassau AP, Gordeev SN, De Groot PA, Gagnon R, Taillefer L. Dynamic Transitions within the Vortex Solid of YBa2Cu3Oy, Single Crystals. Journal of Low Temperature Physics. 1999;117:1507-11.

Kokkaliaris S, Zhukov AA, Gordeev SN, De Groot PA, Gagnon R, Taillefer L. Direct evidence for a Transition from Elastic to Plastic Dynamics in the Vortex System of YBa2Cu3O7-δ. Journal of Low Temperature Physics. 1999;117:1341-5.

Langan RM, Gordeev SN, Oussena M, De Groot PA, Jansen AG, Gagnon R, et al. Scaling behaviour of magneto-resistance in clean YBa2Cu3O7-δ single crystals in the vortex liquid state. Physica C: Superconductivity and its Applications. 1999;313:294-304.

Gordeev SN, Rassau AP, Langan RM, De Groot PA, Geshkenbein VB, Gagnon R, et al. Resistivity of clean YBa2Cu3O7-δ in the pinned-liquid state. Physical Review B. 1999;60:10477-83.

Kokkaliaris S, Gordeev SN, De Groot PA, Gagnon R, Taillefer L, Henry PF, et al. Peak effect and oxygen ordering in YBa2Cu3O7-δ single crystals. Physica C: Superconductivity and its Applications. 1999;320:161-6.

Kokkaliaris S, De Groot PA, Gordeev SN, Zhukov AA, Gagnon R, Taillefer L. Onset of plasticity and hardening of the hysteretic response in the vortex system of YBa2Cu3O7-δ. Physical Review Letters. 1999;82:5116-9.

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