Département de physique | Université de Sherbrooke

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Prochains séminaires

mar, 05/21/2013 - 12:30

Gabriel Poulin-Lamarre
- 12:30
- D3-2040
- To be announced
- Voir Google Calendar

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.
- Voir Google Calendar

lun, 06/03/2013 - 12:30

Bhaskar Roy Bardhan, Department of Physics and Astronomy, Louisiana State University
- 12:30
- D3-2040
- To be annonced
- Voir Google Calendar

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.
- Voir Google Calendar

lun, 06/10/2013 - 12:30

Frank Verstraete , Université de Vienne
- 12:30
- D3-2040
- To be announced
- Voir Google Calendar

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Zhukov AA, De Groot PA, Kokkaliaris S, Di Nicolo E, Jansen AG, Mossang E, et al. History effects and phase diagram near the lower critical point in YBa2Cu3O7 single crystals. Physical Review Letters. 2001;87:017006/1-/4.

Zhukov AA, Kokkaliaris S, De Groot PA, Jansen AG, Mossang E, Asaoka H, et al. Transformations of the peak-effect near the multicritical point in YBa2Cu3Oy single crystals. Physica C: Superconductivity and its Applications. 2000;341-348:1027-30.

Kokkaliaris S, Zhukov AA, De Groot PA, Gagnon R, Taillefer L, Wolf T. History effects and transition to plastic vortex dynamics in YBa2Cu3O7-δ single crystals. Physica C: Superconductivity and its Applications. 2000;332:393-7.

Kokkaliaris S, Zhukov AA, De Groot PA, Gagnon R, Taillefer L, Wolf T. Transition from elastic to plastic vortex phase and its evolution with quenched disorder in YBa2Cu3Oy single crystals. Physical Review B. 2000;61:3655-64.

Zhukov AA, Kokkaliaris S, De Groot PA, Higgins MJ, Bhattacharya S, Gagnon R, et al. Negative dynamic creep in the peak-effect regime in type-II superconductors. Physical Review B. 2000;61:R886-R889.

Kokkaliaris S, Zhukov AA, De Groot PA, Gagnon R, Taillefer L, Wolf T, et al. Transition from elastic to plastic vortex dynamics in YBa2Cu3O7-δ single crystals: The effect of columnar defects. Physica C: Superconductivity and its Applications. 2000;341-348:1041-2.

Kokkaliaris S, Deligiannis K, Oussena M, Zhukov AA, De Groot PA, Gagnon R, et al. Effect of oxygen stoichiometry on the out-of-plane anisotropy of YBa2Cu3O7-δ single crystals near optimal doping. Superconductor Science and Technology. 1999;12:690-3.

Deligiannis K, Kokkaliaris S, Oussena M, De Groot PA, Früchter L, Gagnon R, et al. Evidence of two-dimensional Josephson strings in high-purity YBa2Cu3O7-δ single crystals. Physical Review B. 1999;59:14772-80.

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.

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.

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