Mottness at finite doping and charge-instabilities in cuprates

Peli, Simone; Conte, Stefano dal; Comin, Riccardo; Nembrini, Nicola; Ronchi, Andrea; Abrami, Paolo; Banfi, Francesco; Ferrini, Gabriele; Brida, Daniele; Giannetti, Claudio

Mottness at finite doping and charge-instabilities in cuprates

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Datum

2017

Autor:innen

Peli, Simone

Conte, Stefano dal

Comin, Riccardo

Nembrini, Nicola

Ronchi, Andrea

Abrami, Paolo

Banfi, Francesco

Ferrini, Gabriele

Brida, Daniele

Giannetti, Claudio

et al.

Publikationstyp

Zeitschriftenartikel

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Nature Physics. 2017, 13(8), pp. 806-811. ISSN 1745-2473. eISSN 1745-2481. Available under: doi: 10.1038/NPHYS4112

Zusammenfassung

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.

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530 Physik

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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. 2017, 13(8), pp. 806-811. ISSN 1745-2473. eISSN 1745-2481. Available under: doi: 10.1038/NPHYS4112

BibTex

@article{Peli2017Mottn-40616,
  year={2017},
  doi={10.1038/NPHYS4112},
  title={Mottness at finite doping and charge-instabilities in cuprates},
  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}
}

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    <dcterms:abstract xml:lang="eng">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$0.16 irrespective of the temperature, and it can be well described by dynamical mean field theory calculations. We argue that the onset of the low-temperature charge instabilities is the low-energy manifestation of the underlying Mottness that characterizes the p&lt;p$_{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.</dcterms:abstract>
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