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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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Publications

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Fournier P, R.Gagnon, M.Aubin. 1991. Variable-Range Hopping in YBa2(Cu1-xMx)3O7-y [M = Fe,Zn]. Physica C. 177:159.

Sénéchal D. 2008. The Variational Cluster Approximation for Hubbard Models: Practical Implementation. High Performance Computing Systems and Applications, 2008. HPCS 2008. 22nd International Symposium on. :9-15.

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Senechal2008rz.pdf

Payeur A, Sénéchal D. 2011. Variational cluster approximation study of the one-dimensional Holstein-Hubbard model at half filling. Phys. Rev. B. 83:033104.

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Payeur2011fk.pdf

Ferris A, Vidal G. 2012. Variational Monte Carlo with the Multi-Scale Entanglement Renormalization Ansatz. Abstract

Roche P-E, Kociak M, Guéron S, Kasumov A, Reulet B, Bouchiat H. 2002. Very low shot noise in carbon nanotubes. European Physical Journal B. 28:217-222.

Kyriakidis J, Pioro-Ladrière M, Ciorga M, Sachrajda AS, Hawrylak P. 2002. Voltage-tunable singlet-triplet transition in lateral quantum dots. Physical Review B. 66:353201-353208.

Oussena M, De Groot PAJ, Porter SJ, Gagnon R, Taillefer L. 1995. Vortex channeling along twin planes in YBa2Cu3O7-x. Physical Review B. 51:1389-1392.

Ramshaw BJ, Day J, Vignolle B, Le Boeuf D, Dosanjh P, Proust C, Taillefer L, Liang R, Hardy WN, Bonn DA. 2012. Vortex lattice melting and H c2 in underdoped YBa 2Cu 3O y. Physical Review B - Condensed Matter and Materials Physics. 86

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Ghamlouch H, Aubin M, Gagnon R, Taillefer L. 1997. Vortex movements parallel and perpendicular to twin boundaries seen through the Nernst and Seebeck effects of YBa2Cu3O7-δ. Physica C: Superconductivity and its Applications. 275:141-145.

Oussena M, De Groot PAJ, Deligiannis K, Volkozub AV, Gagnon R, Taillefer L. 1996. Vortex pinning by competing disorder: Bose-glass to vortex-glass crossover. Physical Review Letters. 76:2559-2562.

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