Mottness at finite doping and charge-instabilities in cuprates

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PELI, Simone, Stefano dal CONTE, Riccardo COMIN, Nicola NEMBRINI, Andrea RONCHI, Paolo ABRAMI, Francesco BANFI, Gabriele FERRINI, Daniele BRIDA, Claudio GIANNETTI, 2017. Mottness at finite doping and charge-instabilities in cuprates. In: Nature Physics. 13(8), pp. 806-811. ISSN 1745-2473. eISSN 1745-2481. Available under: doi: 10.1038/NPHYS4112

@article{Peli2017Mottn-40616, title={Mottness at finite doping and charge-instabilities in cuprates}, year={2017}, doi={10.1038/NPHYS4112}, number={8}, volume={13}, issn={1745-2473}, journal={Nature Physics}, pages={806--811}, author={Peli, Simone and Conte, Stefano dal and Comin, Riccardo and Nembrini, Nicola and Ronchi, Andrea and Abrami, Paolo and Banfi, Francesco and Ferrini, Gabriele and Brida, Daniele and Giannetti, Claudio} }

Conte, Stefano dal Nembrini, Nicola Abrami, Paolo 2017-11-15T07:11:48Z Peli, Simone Comin, Riccardo Ronchi, Andrea Mottness at finite doping and charge-instabilities in cuprates Banfi, Francesco Conte, Stefano dal eng Abrami, Paolo The intrinsic instability of underdoped copper oxides towards inhomogeneous states is one of the central puzzles of the physics of correlated materials. The influence of the Mott physics on the doping-temperature phase diagram of copper oxides represents a major issue that is subject of intense theoretical and experimental effort. Here, we investigate the ultrafast electron dynamics in prototypical single-layer Bi-based cuprates at the energy scale of the O-2p$\rightarrow$Cu-3d charge-transfer (CT) process. We demonstrate a clear evolution of the CT excitations from incoherent and localized, as in a Mott insulator, to coherent and delocalized, as in a conventional metal. This reorganization of the high-energy degrees of freedom occurs at the critical doping p$_{cr}\simeq$0.16 irrespective of the temperature, and it can be well described by dynamical mean field theory calculations. We argue that the onset of the low-temperature charge instabilities is the low-energy manifestation of the underlying Mottness that characterizes the p<p$_{cr}$ region of the phase diagram. This discovery sets a new framework for theories of charge order and low-temperature phases in underdoped copper oxides. Brida, Daniele Giannetti, Claudio Ronchi, Andrea Banfi, Francesco Peli, Simone Ferrini, Gabriele Brida, Daniele 2017 Nembrini, Nicola 2017-11-15T07:11:48Z Ferrini, Gabriele Giannetti, Claudio Comin, Riccardo

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