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Mon, 05/27/2013 - 12:30

  1. 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

  1. 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

  1. 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

  1. Frank Verstraete , Université de Vienne
    • 12:30
    • D3-2040
    • To be announced

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Tue, 06/11/2013 - 00:00

  1. Wolfgang Belzig, l'Université de Constance, Allemagne
    • Voir Google Calendar
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Le Boeuf D, Doiron-Leyraud N, Vignolle B, Sutherland M, Ramshaw BJ, Levallois J, et al. Lifshitz critical point in the cuprate superconductor {YBa$_2$Cu$_3$O$_y$} from high-field Hall effect measurements. Physical Review B. 2011;83:054056.
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application/pdf iconLeBoeuf2011fk.pdf
Le Boeuf D, Doiron-Leyraud N, Vignolle B, Sutherland M, Ramshaw BJ, Levallois J, et al. Lifshitz critical point in the cuprate superconductor {$YBa_2Cu_3O_y$} from high-field Hall effect measurements. Physical Review B - Condensed Matter and Materials Physics. 2011;83.
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Hawthorn DG, Li SY, Sutherland M, Boaknin E, Hill RW, Proust C, et al. Doping dependence of the superconducting gap in Tl2 Ba2 CuO6+δ from heat transport. Physical Review B. 2007;75.
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Sutherland M, Doiron-Leyraud N, Taillefer L, Weller T, Ellerby M, Saxena SS. Bulk evidence for single-gap s-wave superconductivity in the intercalated graphite superconductor C6Yb. Physical Review Letters. 2007;98.
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Ronning F, Hill RW, Sutherland M, Hawthorn DG, Tanatar MA, Paglione J, et al. Thermal conductivity in the vicinity of the quantum critical end point in Sr3Ru2O7. Physical Review Letters. 2006;97.
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Doiron-Leyraud N, Sutherland M, Li SY, Taillefer L, Liang R, Bonn DA, et al. Onset of a boson mode at the superconducting critical point of underdoped YBa2Cu3Oy. Physical Review Letters. 2006;97.
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Paglione J, Tanatar MA, Hawthorn DG, Ronning F, Hill RW, Sutherland M, et al. Nonvanishing energy scales at the quantum critical point of CeCoIn5. Physical Review Letters. 2006;97.
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Sutherland M, Li SY, Hawthorn DG, Hill RW, Ronning F, Tanatar MA, et al. Delocalized fermions in underdoped cuprate superconductors. Physical Review Letters. 2005;94.
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Tanatar MA, Paglione J, Nakatsuji S, Hawthorn DG, Boaknin E, Hill RW, et al. Unpaired electrons in the heavy-fermion superconductor CeCoIn5. Physical Review Letters. 2005;95:1-4.
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Paglione J, Tanatar MA, Hawthorn DG, Hill RW, Ronning F, Sutherland M, et al. Heat transport as a probe of electron scattering by spin fluctuations: The case of antiferromagnetic CeRhIn5. Physical Review Letters. 2005;94:1-4.
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