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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Jandl S, Mansouri S, Mukhin AA, Yu Ivanov V, Balbashov A, Gospodino MM, et al. Study of crystal-field excitations and Raman active phonons in o-DyMnO 3. Journal of Magnetism and Magnetic Materials. 2011;323:1104-8.

Jandl S, Lévesque Y, Nekvasil V, Bettinelli M. Raman active phonon and crystal-field studies of Yb3+ doped NdVO4. Optical Materials. 2010;32:1549-52.

Nekvasil V, Jandl S, Mukhin AA, Ivanov VY, Balbashov AM. Infrared study of SmMnO3 crystal field excitations. Journal of Applied Physics. 2009;105.

Jandl S, Ĺvesque Y, Nekvasil V, Bettinelli M. Crystal-field study of Yb3+ doped LuVO4. Journal of Applied Physics. 2008;103.

Jandl S, Nekvasil V, Mukhin AA, Sadowski ML. Infrared study in high magnetic fields of the crystal-field excitations in PrMnO3. Journal of Magnetism and Magnetic Materials. 2007;311:583-8.

Jandl S, Mukhin AA, Ivanov VY, Nekvasil V, Sadowski ML. Raman-active phonons and Nd3+ crystal-field studies of weakly doped Nd1-x Srx MnO3. Physical Review B. 2005;72.

Jandl S, Nekvasil V, Divi{\v s} M, Mukhin AA, Hölsä J, Sadowski ML. Infrared study of the crystal-field excitations in NdMnO3 in high magnetic fields. Physical Review B. 2005;71:024417-1.

Richard P, Jandl S, Poirier M, Fournier P, Nekvasil V, Sadowski ML. Infrared Zeeman study of the Nd[sup 3+]-Cu[sup 2+] anisotropic exchange interaction in Nd[sub 2]CuO[sub 4]. Physical Review B. 2005;72:014506.

Richard P, Jandl S, Poirier M, Fournier P, Nekvasil V, Sadowski ML. Infrared Zeeman study of the Nd3+-Cu2+ anisotropic exchange interaction in Nd2CuO4. Physical Review B. 2005;72:1-10.

Barba D, Jandl S, Nekvasil V, Mary{\v s}ko M, Jurek K, Divi{\v s} M, et al. Infrared transmission study of crystal-field excitations in Al- and Sr-doped Pr1+xBa2-xCu3O6. Physical Review B. 2004;69:245281-8.

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