Understanding the complex dynamics of superconducting cuprates by broadband ultrafast spectroscopy

Speaker: 
Claudio Giannetti (Universita Cattolica del Sacro Cuore)
Event Date and Time: 
Thu, 2011-11-24 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Andrea Damascelli
Intended Audience: 
Graduate
In strongly-correlated systems the electronic properties at the Fermi energy are intertwined with those at high energy scales and are strongly affected by different degrees of freedom, such as lattice vibration, bosonic excitations of electronic origin, quasi-particle excitations. Broadband ultrafast spectroscopy is emerging as the premier technique to disentangle the subtle interplay of the different degrees of freedom, on the basis of the different characteristic timescales and spectral responses. In particular, we will focus on one of the pivotal challenges in the field of high-temperature superconductivity (HTSC), i.e. understanding whether and how the high energy scale physics associated with Mott-like excitations (|E-EF|>1 eV) is involved in the condensate formation. We will show the interplay between the many-body high-energy CuO2 excitations at 1.5 and 2 eV and the onset of HTSC in Bi2Sr2Ca0.92Y0.08Cu2O8+δ. These results unveil an unconventional mechanism at the base of HTSC both below and above the optimal hole concentration required to attain the maximum critical temperature (Tc).
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