Optical perturbation of the "hole-pockets" in the underdoped high <i>T</i><sub>c</sub> superconducting cuprates
ORAL
Abstract
The high Tc superconducting cuprates are considered doped Mott insulators. As a function of doping and temperature there is a crossover from this regime into a phase characterized a Marginal Fermi Liquid. Several calculations of the doped Mott insulating phase indicate that the Fermi surface defines small pockets which at higher doping levels switch to a full closed Fermi surface, characteristic of a more metallic system. Here we use femtosecond laser based pump-probe techniques to investigate the structure of the Fermi surface in underdoped Bi2Sr2CaCu2O8+δ and compare it with that associated with the optimally doped material. We confirm the concept of a small pocket in the underdoped system consistent with theoretical predictions in this strongly correlated state.
*This work was funded by the Deutsche Forschungsgemeinschaft through Sfb 616, Sfb 1242, and SPP 1458, from the Mercator Research Center Ruhr through Grant No. PR-2011-0003, and from the European Union within the seventh Framework Program under Grant No. 280555 (GO FAST). The work at Brookhaven Laboratory was supported in part by the Center for Emergent Superconductivity (CES), an EFRC funded by the US DOE, Office of Basic Energy Sciences and in part by the Office of Science, U.S. DOE under contract number DE-SC001274.
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Presenters
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Peter Johnson
- Brookhaven National Laboratory