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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Hawthorn DG, Li SY, Sutherland M, Boaknin E, Hill RW, Proust C, et al. Doping dependence of the superconducting gap in Tl2 Ba2 CuO6+δ from heat transport. Physical Review B. 2007;75.

Tanatar MA, Paglione J, Nakatsuji S, Hawthorn DG, Boaknin E, Hill RW, et al. Unpaired electrons in the heavy-fermion superconductor CeCoIn5. Physical Review Letters. 2005;95:1-4.

Paglione J, Tanatar MA, Hawthorn DG, Boaknin E, Hill RW, Ronning F, et al. Field-induced quantum critical point in CeCoIn5. Physica C: Superconductivity and its Applications. 2004;408-410:705-6.

Hill RW, Lupien C, Sutherland M, Boaknin E, Hawthorn DG, Proust C, et al. Transport in Ultraclean YBa2Cu3O7: Neither Unitary nor Born Impurity Scattering. Physical Review Letters. 2004;92:270011-4.

Sutherland M, Hawthorn DG, Hill RW, Ronning F, Zhang H, Boaknin E, et al. Doping dependence of superconducting gap in YBa2Cu 3Oy from universal heat transport. Physica C: Superconductivity and its Applications. 2004;408-410:672-3.

Boaknin E, Tanatar MA, Paglione J, Hawthorn DG, Hill RW, Ronning F, et al. Multi-band superconductivity in NbSe2 from heat transport. Physica C: Superconductivity and its Applications. 2004;408-410:727-8.

Hawthorn DG, Hill RW, Ronning F, Sutherland M, Boaknin E, Tanatar MA, et al. Field-induced thermal metal-to-insulator transition in underdoped LSCO. Physica C: Superconductivity and its Applications. 2004;408-410:725-6.

Sonier JE, Callaghan FD, Miller RI, Boaknin E, Taillefer L, Kiefl RF, et al. Shrinking magnetic vortices in V3Si due to delocalized quasiparticle core states: Confirmation of the microscopic theory for interacting vortices. Physical Review Letters. 2004;93:017002-1.

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.

Boaknin E, Tanatar MA, Paglione J, Hawthorn D, Ronning F, Hill RW, et al. Heat conduction in the vortex state of NbSe2: Evidence for multiband superconductivity. Physical Review Letters. 2003;90:117003/1-/4.

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