Stripes in cuprate superconductors: Excitations and dynamic dichotomy

Abstract

We present a short account of the present experimental situation of stripes in cuprates followed by a review of our present understanding of their ground state and excited state properties. Collective modes, the dynamical structure factor, and the optical conductivity of stripes are computed using the time-dependent Gutzwiller approximation applied to realistic one band and three band Hubbard models, and are found to be in excellent agreement with experiment. On the other hand, experiments like angle-resolved photoemission and scanning tunneling microscopy show the coexistence of stripes at high energies with Fermi liquid quasiparticles at low energies. We show that a phenomenological model going beyond mean-field can reconcile this dynamic dichotomy.

Insights into the high temperature superconducting cuprates from resonant inelastic X-ray scattering

“…As discussed in Section 1.2, underdoped cuprates show a tendency towards density-wave ordering, with resonant soft x-ray studies playing an important role in characterizing the nature of the order [58,115,116]. In La 2−x Ba x CuO 4 in particular, charge and spin ordering is well established [117,118,119,120] and there have already been extensive INS studies measuring how the magnetic excitations are renormalized by static stripe ordering around the magnetic ordering wavevector (0.38, 0.5) [84].…”

“…Future higher resolution measurements will be vital in order to resolve this mystery. Such measurements can also, in principle, determine the distribution of anisotropic holes within the CuO 2 plane [121,116] and, in particular, distinguish bond and site centered stripes [122]. There is also an opportunity to identify excitations associated with the one-dimensional nature of the magnetic stripe itself.…”

Spins, stripes, and superconductivity in hole-doped cuprates

“…1(a), however, the site- 0031-9007y98y80 (6)y1272 (4) [101, 102] using the density matrix renormalization group technique on a t-J model at an average hole density of 1/8. There have also been extensive calculations of stripes using the Gutzwiller approximation by Seibold et al [103]; these are just a few of many calculations that have been done. Spin and charge inhomogeneity have also been proposed from another direction.…”

Energy-dependent crossover from anisotropic to isotropic magnetic dispersion in lightly doped La1.96Sr0.04CuOMatsuda1, Granroth2, Fujita3 et al. 2013Phys. Rev. B10190View full textAdd to dashboardCite

“…A calculation based on the timedependent Gutzwiller approximation applied to the Hubbard model does slightly better, but still exhibits two-fold symmetry at all energies. 27,28 Hence, stripe-based calculations thus far have not been able to describe the combination of two-fold and four-fold symmetry observed in YBa 2 Cu 3 O 6+x . 4,5,7,11 This leaves us with the question of whether the symmetry recovery in YBCO is incompatible with stripe correlations or simply with the stripe models considered so far.…”