Department of Physics | Université de Sherbrooke

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Mon, 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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Mon, 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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Wed, 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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Mon, 06/10/2013 - 12:30

Frank Verstraete , Université de Vienne
- 12:30
- D3-2040
- To be announced
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Tue, 06/11/2013 - 00:00

Wolfgang Belzig, l'Université de Constance, Allemagne
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Li SY, Bonnemaison J-, Payeur A, Fournier P, Wang CH, Chen XH, et al. Reply to comment on {``Low-temperature phonon thermal conductivity of single-crystalline Nd$_2$CuO$_4$: Effects of sample size and surface roughness''}. Physical Review B. 2009;79.

Li SY, Bonnemaison J-, Payeur A, Fournier P, Wang CH, Chen XH, et al. Low-temperature phonon thermal conductivity of single-crystalline Nd2 Cu O4: Effects of sample size and surface roughness. Physical Review B. 2008;77.

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.

Li SY, Taillefer L, Wang CH, Chen XH. Ballistic magnon transport and phonon scattering in the antiferromagnet Nd2CuO4. Physical Review Letters. 2005;95:1-4.

Li SY, Taillefer L, Hawthorn DG, Tanatar MA, Paglione J, Sutherland M, et al. Giant electron-electron scattering in the fermi-liquid state of Na 0.7CoO2. Physical Review Letters. 2004;93:056401-056401-4.

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