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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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.

Langan RM, Gordeev SN, De Groot PA, Jansen AG, Gagnon R, Taillefer L. Phase diagram of optimally doped YBa2Cu3O7-δ: Effect of oxygen stoichiometry. Physical Review B. 1998;58:14548-55.

Langan RM, Gordeev SN, Oussena M, Pinfold S, De Groot PA, Jansen L, et al. Field induced suppression of the vortex lattice melting transition in twinned YBa2Cu3O7-δ. Physica C: Superconductivity and its Applications. 1997;282:2017-8.

Gordeev SN, De Groot PA, Oussena M, Volkozub AV, Langan RM, Rassau AP, et al. Current-induced resistivity hysteresis in detwinned YBa2Cu3O7-δ single crystals. Physica C: Superconductivity and its Applications. 1997;282:2031-2.

Langan RM, Gordeev SN, Oussena M, Pinfold S, De Groot PA, Gagnon R, et al. The peak effect as a phase boundary in detwinned YBa2Cu3O7-δ. Physica C: Superconductivity and its Applications. 1997;282:2039-40.

Gordeev SN, De Groot PA, Oussena M, Langan RM, Rassau AP, Gagnon R, et al. Organisation of vortex motion in detwinned YBa2Cu3O7-δ single crystals. Physica C: Superconductivity and its Applications. 1997;282:2033-4.

Gordeev SN, De Groot PA, Oussena M, Volkorub AV, Pinfold S, Langan RM, et al. Novel vortex dynamics in untwinned YBa2Cu3O7-δ single crystals. Journal of Low Temperature Physics. 1996;105:1147-52.

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