Department of Physics | Université de Sherbrooke

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Tue, 05/21/2013 - 12:30

Gabriel Poulin-Lamarre
- 12:30
- D3-2040
- To be announced
- Voir Google Calendar

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.
- Voir Google Calendar

Mon, 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

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.
- Voir Google Calendar

Mon, 06/10/2013 - 12:30

Frank Verstraete , Université de Vienne
- 12:30
- D3-2040
- To be announced
- Voir Google Calendar

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Poirier M, Fournier D, Castonguay M, Truong KD. Ultrasonic investigation of the P-T phase diagram of κ-(BEDT-TTF) 2X organic superconductors. In: Journal De Physique. IV : JP. Vol 114.; 2004. p. 251-5.

Fournier D, Bédard S, Poirier M, Castonguay M, Truong KD. Microwave study of the superconducting state of h8 and d 8 κ-(BEDT-TTF)2Cu[N(CN)2]CI organic conductors. In: Journal De Physique. IV : JP. Vol 114.; 2004. p. 317-8.

Fournier D, Poirier M, Castonguay M, Truong KD. Mott transition, compressibility divergence, and the P-T phase diagram of layered organic superconductors: An ultrasonic investigation. Physical Review Letters. 2003;90:127002/1-/4.

Poirier M, Castonguay M, Revcolevschi A, Dhalenne G. Ultrasonic investigation of the magnetic ordering in the quasi-one-dimensional S=1/2 antiferromagnet BaCu2Si2O7. Physical Review B. 2002;66:544021-5.

Mehta V, Guillot-Noël O, Gourier D, Ichalalène Z, Castonguay M, Jandl S. Optical Zeeman effect measurements on isolated and ferromagnetically coupled Nd3+ ions in weakly doped YVO4 crystals: Evidence for lack of crystal field perturbations in ion pair interactions. Journal of Physics Condensed Matter. 2000;12:7149-60.

Frikach K, Poirier M, Castonguay M, Truong KD. Elastic study of antiferromagnetic fluctuations in the layered organic superconductors κ-(BEDT-TTF)2X. Physical Review B. 2000;61:R6491-R6494.

Fertey P, Poirier M, Castonguay M, Jegoudez J, Revcolevschi A. Ultrasonic evidence of a spin-Peierls transition in α'-NaV2O5. Physical Review B. 1998;57:13698-701.

Jandl S, Poirier M, Castonguay M, Fronzes P, Musfeldt JL, Revcolevschi A, et al. Phonons in pure and doped CuGeO3 spin-Peierls crystals: Raman and ultrasonic studies. Physical Review B. 1996;54:7318-22.

Poirier M, Castonguay M, Revcolevschi A, Dhalenne G. Ultrasonic study of the magnetic phase diagram of the spin-Peierls system CuGeO3. Physical Review B. 1995;51:6147-50.

Poirier M, Castonguay M, Revcolevschi A, Dhalenne G. Magnetoelastic coupling and order parameter in the spin-Peierls system CuGeO3. Physical Review B. 1995;52:16058-65.

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