Condensed Matter Seminars

Condensed matter without matter: towards many-body states with light

Speaker: 
Andrew Houck (Princeton University)
Event Date and Time: 
Thu, 2012-01-26 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Joshua Folk
Intended Audience: 
Graduate
Photons do not interact strongly in nature, and have thus been relegated to a role as a tool rather than an object of study in condensed matter physics. However, in cavity quantum electrodynamics, the strong interaction of light with a single atom can lead to strong atom-mediated photon-photon interactions, even when the light and atomic transitions are not resonant. Recent theoretical proposals have predicted phase transitions in arrays of these cavities, demonstrating that complex matter-like phenomena can emerge from a sea of interacting photons.

Electron-phonon coupling in underdoped cuprates

Speaker: 
Andrey Mischenko (Cross-Correlated Materials Research Group, Riken, Japan)
Event Date and Time: 
Mon, 2011-12-05 12:00
Location: 
Hennins 318

The angle resolved photoemission spectra (ARPES) and optical conductivity (OC) of the underdoped high temperature superconductors is studied in the framework of the low density limit of the t-J-Holstein.

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.
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