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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Daou R, Cyr-Choinière O, Laliberté F, Le Boeuf D, Doiron-Leyraud N, Yan J-, et al. Erratum: Thermopower across the stripe critical point of La1.6-x Nd0.4 Srx Cu O4: Evidence for a quantum critical point in a hole-doped high- Tc superconductor (Physical Review B (2009) 79 (180505)). Physical Review B. 2009;79.

Doiron-Leyraud N, Auban-Senzier P, René de Cotret S, Bourbonnais C, Jérome D, Bechgaard K, et al. Correlation between linear resistivity and Tc in the Bechgaard salts and the pnictide superconductor Ba ( Fe1-x Cox )2 As2. Physical Review B. 2009;80.

Daou R, Doiron-Leyraud N, Le Boeuf D, Li SY, Laliberté F, Cyr-Choinière O, et al. Linear temperature dependence of resistivity and change in the Fermi surface at the pseudogap critical point ofahigh-Tc superconductor. Nature Physics. 2009;5:31-4.

Audouard A, Jaudet C, Vignolles D, Liang R, Bonn DA, Hardy WN, et al. Multiple quantum oscillations in the de haas-van alphen spectra of the underdoped high-temperature superconductor YBa2Cu3O6.5. Physical Review Letters. 2009;103.

Daou R, Cyr-Choinière O, Laliberté F, Le Boeuf D, Doiron-Leyraud N, Yan J-, et al. Thermopower across the stripe critical point of La1.6-x Nd0.4 Srx CuO4: Evidence for a quantum critical point in a hole-doped high- Tc superconductor. Physical Review B. 2009;79.

Taillefer L. Fermi surface reconstruction in high-Tc superconductors. Journal of Physics Condensed Matter. 2009;21.

Shakeripour H, Petrovic C, Taillefer L. Heat transport as a probe of superconducting gap structure. New Journal of Physics. 2009;11.

Li SY, Bonnemaison J-, Payeur A, Fournier P, Wang CH, Chen XH, et al. Low-temperature phonon thermal conductivity of single-crystalline Nd[sub 2]CuO[sub 4]: Effects of sample size and surface roughness. Physical Review B. 2008;77:134501.

Bangura AF, Fletcher JD, Carrington A, Levallois J, Nardone M, Vignolle B, et al. Small fermi surface pockets in underdoped high temperature superconductors: Observation of Shubnikov-de Haas oscillations in YBa2Cu4O8. Physical Review Letters. 2008;100.

Hill RW, Li S, Maple MB, Taillefer L. Multiband order parameters for the PrOs4Sb12 and PrRu4Sb12 skutterudite superconductors from thermal conductivity measurements. Physical Review Letters. 2008;101.

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