Anisotropic softening of collective charge modes in the vicinity of critical doping in a doped Mott insulator

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dc.creatorLi, Y. W.
dc.creatorQian, D.
dc.creatorWray, L.
dc.creatorHsieh, D.
dc.creatorKaga, Y.
dc.creatorSasagawa, T.
dc.creatorTakagi, H.
dc.creatorMarkiewicz, R. S.
dc.creatorBansil, A.
dc.creatorEisaki, H.
dc.creatorUchida, S.
dc.creatorHasan, M. Z.
dc.date2007-04-24
dc.date.accessioned2026-07-07T12:11:29Z
dc.date.available2026-07-07T12:11:29Z
dc.descriptionMomentum resolved inelastic resonant x-ray scattering is used to map the evolution of charge excitations over a large range of energies, momenta and doping levels in the electron doped Mott insulator class Nd$_{2-x}$Ce$_x$CuO$_4$. As the doping induced AFM-SC (antiferromagnetic-superconducting) transition is approached, we observe an anisotropic softening of collective charge modes over a large energy scale along the Gamma to (π,π)-direction, whereas the modes exhibit broadening ($\sim$ 1 eV) with relatively little softening along Gamma to (π,0) with respect to the parent Mott insulator (x=0). Our study indicates a systematic collapse of the gap consistent with the scenario that the system dopes uniformly with electrons even though the softening of the modes involves an unusually large energy scale.
dc.description5 pages + 5 Figures
dc.identifierhttps://arxiv.org/abs/0704.3111
dc.identifierhttp://arxiv.org/abs/0704.3111
dc.identifierPhys. Rev. B 78, 073104 (2008)
dc.identifierdoi:10.1103/PhysRevB.78.073104
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/210232
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleAnisotropic softening of collective charge modes in the vicinity of critical doping in a doped Mott insulator
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