Recent Changes

Monday, April 9

Wednesday, November 12

  1. 2:23 am

Saturday, July 12

  1. 8:13 am

Monday, December 17

  1. page home edited ... ATTENTION MAC USERS Until a bug is fixed, Safari cannot be used with the visual editor, only …
    ...
    ATTENTION MAC USERS
    Until a bug is fixed, Safari cannot be used with the visual editor, only with the text editor. We recommend the FIREFOX browser instead, whch is already available on your workstation at KITP or can be downloaded from here. (Mozilla's Firefox is free and available for nearly all operating systems.)

    (view changes)
    7:24 am

Monday, December 10

  1. page Seminar Schedule edited ... couplings for magnetism-driven ferroelectricity Thu Dec 13 10:30 11:00 TBA Maurits Have…
    ...
    couplings for magnetism-driven ferroelectricity
    Thu Dec 13
    10:3011:00
    TBA
    Maurits Haverkort
    (view changes)
    10:07 am

Saturday, December 8

  1. page Seminar Schedule edited ... SSR Sang-Wook Cheong Seminar: TBA Symmetric vs. antisymmetric couplings for magnetism-dri…
    ...
    SSR
    Sang-Wook Cheong
    Seminar: TBASymmetric vs. antisymmetric
    couplings for magnetism-driven ferroelectricity

    Thu Dec 13
    10:30
    (view changes)
    11:56 am

Friday, December 7

  1. page vanderMarel edited "Optics clues to pairing glues". One possible interpretation of the infrared optical sp…
    "Optics clues to pairing glues".
    One possible interpretation of the infrared optical spectra of conducting
    materials uses the standard Kubo expression for a liquid of electrons
    coupled to a bosonic 'glue' described by a function $\alpha^2F(\omega)$
    representing phonons, spin-fluctuations or other electronic degrees of
    freedom. We have applied this approach to a series of high T$_c$
    superconducting materials, using an unbiased flexible function fitting of
    $\alpha^2F(\omega)$, with the aim to find out whether a consistent
    description of transport, optical and photo-electron spectra can be
    obtained. While it is probably justified to call into question the
    applicability of standard expressions for electron-boson coupling to these
    strongly correlated materials, the fitted $\alpha^2F(\omega)$ provides a
    compact and perhaps insightful way to characterize the transport and optical
    properties, which is deemed to merge with a conventional bosonic spectrum
    when the Fermi-liquid state is approached.
    The outcome is, that the best fits of the optical data to a strong-coupling
    model are obtained with two components in the glue: one at 60 meV and the
    other at 250 meV. We observe qualitatively the same features in samples from
    underdoped to overdoped Bi2212, Bi2223, and Hg1201. The high energy scale of
    the fluctuations emanating from this analysis forms a peculiarity not
    traditionally associated with electron-phonon coupling, and implies strong
    coupling of the electrons among themselves, to spin-fluctuations or to other
    electronic degrees of freedom. While the overall frequency dependence of the
    thus-obtained 'glue' function appears to be significantly richer in
    structure than the marginal Fermi liquid model, one crucial feature of the
    latter model is also present in the experimental data: The 'glue' function
    calculated from the experimental data has significant temperature dependence
    at the low frequency end of the spectrum, a feature which is not normally
    associated with electron-phonon coupling.

    (view changes)
    9:35 am
  2. page Seminar Schedule edited ... Mona Berciu Seminar: The Green's function of a Holstein polaron Tue Dec 11 12:30 TBA Dir…
    ...
    Mona Berciu
    Seminar: The Green's function of a Holstein polaron
    Tue Dec 11
    12:30
    TBA
    Dirk van der Marel
    Seminar: Optics clues to pairing glues
    Wed Dec 12
    12:30
    SSR
    Sang-Wook Cheong
    Seminar: TBA
    Thu Dec 13
    10:30
    TBA
    Maurits Haverkort
    Seminar: Spin-orbit effects in the ruthenates

    Activities nearby:
    Seminars at Microsoft Station Q
    (view changes)
    9:34 am

Tuesday, December 4

  1. page Seminar Schedule edited ... SSR Sudhakar Yarlagadd ... in one dimensio dimension Wed Dec 5 12:30
    ...
    SSR
    Sudhakar Yarlagadd
    ...
    in one dimensiodimension
    Wed Dec 5
    12:30
    (view changes)
    10:38 am
  2. page Seminar Schedule edited ... Jason Alicea Seminar: Frustrated Diamond Lattice Antiferromagnets Wed Dec 5 10:30 SSR Su…
    ...
    Jason Alicea
    Seminar: Frustrated Diamond Lattice Antiferromagnets
    Wed Dec 5
    10:30
    SSR
    Sudhakar Yarlagadd
    Seminar: Cooperative electron-phonon interaction in one dimensio

    Wed Dec 5
    12:30
    (view changes)
    10:37 am

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