Département de physique | Université de Sherbrooke

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Prochains séminaires

Demain

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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Sutherland M, Hawthorn DG, Hill RW, Ronning F, Wakimoto S, Zhang H, et al. Thermal conductivity across the phase diagram of cuprates: Low-energy quasiparticles and doping dependence of the superconducting gap. Physical Review B. 2003;67:1745201-17452011.

Matl P, Ong NP, Gagnon R, Taillefer L. Collapse of the vortex-lattice inductance and shear modulus at the melting transition in untwinned YBa2Cu3O7. Physical Review B. 2002;65:2145141-21451411.

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.

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.

Xu ZA, Zhang Y, Ong NP, Krishana K, Gagnon R, Taillefer L. Wiedemann-Franz ratio in YBa2Cu3O7-δ determined from the thermal Hall conductivity. Physica C: Superconductivity and its Applications. 2000;341-348:III/.

Zhang Y, Ong NP, Xu ZA, Krishana K, Gagnon R, Taillefer L. Determining the Wiedemann-Franz Ratio from the Thermal Hall Conductivity: Application to Cu and YBa2Cu3O6.95. Physical Review Letters. 2000;84:2219-22.

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.

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.

Chiao M, Hill RW, Lupien C, Taillefer L, Lambert P, Gagnon R, et al. Low-energy quasiparticles in cuprate superconductors: A quantitative analysis. Physical Review B. 2000;62:3554-8.

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.

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