Department of Physics | Université de Sherbrooke

Skip to Main Content Area

Upcoming events

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

Gilmore K, Garate I, MacDonald AH, Stiles MD. First-principles calculation of the nonadiabatic spin transfer torque in Ni and Fe. Physical Review B - Condensed Matter and Materials Physics. 2011;84.

Côté R, Luo W, Petrov B, Barlas Y, MacDonald AH. Orbital and interlayer skyrmion crystals in bilayer graphene. Phys. Rev. B. 2010;82:245307.

Côté R, Lambert J, Barlas Y, MacDonald AH. Orbital order in bilayer graphene at filling factor nu=-1. Phys. Rev. B. 2010;82:035445.

Barlas Y, Côté R, Lambert J, MacDonald AH. Anomalous {Exciton-Condensation} in Graphene Bilayers. Phys. Rev. Lett.. 2010;104:096802.

Garate I, MacDonald AH. Influence of a transport current on magnetic anisotropy in gyrotropic ferromagnets. Physical Review B - Condensed Matter and Materials Physics. 2009;80.

Garate I, Gilmore K, Stiles MD, MacDonald AH. Nonadiabatic spin-transfer torque in real materials. Physical Review B - Condensed Matter and Materials Physics. 2009;79.

Garate I, Sinova J, Jungwirth T, MacDonald AH. Theory of weak localization in ferromagnetic (Ga,Mn)As. Physical Review B - Condensed Matter and Materials Physics. 2009;79.

Barlas Y, Côté R, Nomura K, MacDonald AH. Intra-Landau-Level Cyclotron Resonance in Bilayer Graphene. Physical Review Letters. 2008;101:097601. Abstract

Côté R, MacDonald AH, Brey L, Fertig HA, Girvin SM, Stoof HT. Collective Excitations, NMR, and Phase Transitions in Skyrme Crystals. Phys. Rev. Lett.. 1997;78:4825-8.

Fertig HA, Brey L, Côté R, MacDonald AH, Karlhede A, Sondhi SL. Hartree-Fock theory of Skyrmions in quantum Hall ferromagnets. Phys. Rev. B. 1997;55:10671-80.

login