@misc{SeiboldCastellaniDiCastro, author = {Seibold, G{\"o}tz and Castellani, Claudio and Di Castro, Carlo}, title = {Fermi surface and electronic structure of incommensurate charge-density-wave systems}, language = {en} } @misc{SeiboldBeccaBuccietal., author = {Seibold, G{\"o}tz and Becca, Federico and Bucci, F. and Castellani, Claudio and Di Castro, Carlo and Grilli, Marco}, title = {Spectral properties of incommensurate charge-density wave systems}, language = {en} } @misc{SeiboldCastellaniDiCastroetal., author = {Seibold, G{\"o}tz and Castellani, Claudio and Di Castro, Carlo and Grilli, Marco}, title = {Striped phases in the two-dimensional Hubbard model with long-rangeCoulomb interaction}, language = {en} } @misc{SeiboldCastellaniDiCastroetal., author = {Seibold, G{\"o}tz and Castellani, Claudio and Di Castro, Carlo and Grilli, Marco}, title = {Fermi surface and photoemission lineshape of incommensurate CDW systems}, language = {en} } @incollection{SeiboldCastellaniDiCastroetal., author = {Seibold, G{\"o}tz and Castellani, Claudio and Di Castro, Carlo and Grilli, Marco}, title = {Domain wall structures in the two-dimensional Hubbard modelwith long-range Coulomb interaction}, series = {Stripes and Related Phenomena}, booktitle = {Stripes and Related Phenomena}, editor = {Bianconi, Antonio and Saini, Naurang L.}, publisher = {Kluwer Academic Plenum}, address = {New York}, isbn = {0-306-46419-5}, doi = {10.1007/0-306-47100-0_18}, pages = {151 -- 157}, language = {en} } @misc{SeiboldCastellaniDiCastroetal., author = {Seibold, G{\"o}tz and Castellani, Claudio and Di Castro, Carlo and Grilli, Marco}, title = {Role of the long-range Coulomb interaction on the formation of striped phases in the two-dimensional Hubbard model}, series = {High temperature superconductivity, Coral Gables, Florida, January 1999}, journal = {High temperature superconductivity, Coral Gables, Florida, January 1999}, editor = {Barnes, Stewart E.}, publisher = {AIP Publishing}, address = {Melville, New York}, isbn = {1-56396-880-0}, doi = {10.1063/1.59651}, language = {en} } @misc{SeiboldDiCastroGrillietal., author = {Seibold, G{\"o}tz and Di Castro, Carlo and Grilli, Marco and Lorenzana, Jos{\´e}}, title = {Spin excitations of ferronematic order in underdoped cuprate superconductors}, series = {Scientific reports}, journal = {Scientific reports}, number = {4}, issn = {2045-2322}, doi = {10.1038/srep05319}, pages = {5319}, abstract = {High-temperature superconductors exhibit a characteristic hourglass-shaped spectrum of magnetic fluctuations which most likely contribute to the pairing glue in the cuprates. Recent neutron scattering experiments in strongly underdoped compounds have revealed a significant low energy anisotropy of these fluctuations which we explain by a model in which topological defects of the antiferromagnet clump to producing domain wall segments with ferronematic order. This state does not invoke global charge order but breaks C4 rotational and inversion symmetry. The incommensurability of the low doping charge-disordered state is in good agreement with experiment and interpolates smoothly with the incommensurability of the stripe phase at higher doping. Within linear spin-wave theory the dynamic structure factor is in very good agreement with inelastic neutron scattering data and can account for the observed energy dependent anisotropy.}, language = {en} } @misc{SeiboldCapatiGrillietal., author = {Seibold, G{\"o}tz and Capati, Matteo and Grilli, Marco and Di Castro, Carlo and Grilli, Marco and Lorenzana, Jos{\´e}}, title = {Hidden ferronematic order in underdoped cuprates}, series = {Physical Review B}, volume = {87}, journal = {Physical Review B}, number = {3}, issn = {2469-9969}, doi = {10.1103/PhysRevB.87.035138}, pages = {035138}, abstract = {We study a model for low-doped cuprates where holes aggregate into oriented stripe segments which have a magnetic vortex and antivortex at the extremes. We argue that due to the interaction between segments a ferronematic state with macroscopic polarization is stabilized. This state can be characterized as a charge nematic which, due to the net polarization, breaks inversion symmetry and also exhibits an incommensurate spin modulation. Our calculation can reproduce the doping-dependent spin structure factor of lanthanum cuprates in excellent agreement with experiment and allows to rationalize experiments in which the incommensurability has an order-parameter-like temperature dependence.}, language = {en} } @misc{CapraraGrilliDiCastroetal., author = {Caprara, Sergio and Grilli, Marco and Di Castro, Carlo and Seibold, G{\"o}tz}, title = {Pseudogap and (An)isotropic Scattering in the Fluctuating Charge-Density Wave Phase of Cuprates}, series = {Journal of Superconductivity and Novel Magnetism}, volume = {30}, journal = {Journal of Superconductivity and Novel Magnetism}, number = {1}, issn = {1557-1939}, doi = {10.1007/s10948-016-3775-9}, pages = {25 -- 30}, abstract = {We present a general scenario for high-temperature superconducting cuprates, based on the presence of dynamical charge density waves (CDWs) and to the occurrence of a CDW quantum critical point, which occurs, e.g., at doping p ≈ 0.16 in YBa2Cu3O6 + δ (YBCO). In this framework, the pseudogap temperature T∗ is interpreted in terms of a reduction of the density of states due to incipient CDW and, at lower temperature to the possible formation of incoherent superconducting pairs. The dynamically fluctuating character of CDW accounts for the different temperatures at which the CDW onset revealed by X-ray scattering (Tons(p)), and the static three-dimensional CDW ordering appear. We also investigate the anisotropic character of the CDW-mediated scattering. We find that this is strongly anisotropic only close to the CDW quantum critical point (QCP) at low temperature and very low energy. It rapidly becomes nearly isotropic and marginal-Fermi-liquid-like away from the CDW QCP and at finite (even rather small) energies. This may reconcile the interpretation of Hall measurements in terms of anisotropic CDW scattering with recent photoemission experiments Bok, J.M., et al. Sci. Adv. 2, e1501329 (2016).}, language = {en} } @misc{CapatiCapraraDiCastroetal., author = {Capati, Matteo and Caprara, Sergio and Di Castro, Carlo and Grilli, Marco and Seibold, G{\"o}tz and Lorenzana, Jos{\´e}}, title = {Electronic polymers and soft-matter-like broken symmetries in underdoped cuprates}, series = {Nature Communications}, volume = {6}, journal = {Nature Communications}, issn = {2041-1723}, doi = {doi:10.1038/ncomms8691}, pages = {7691}, abstract = {Empirical evidence in heavy fermion, pnictide and other systems suggests that unconventional superconductivity appears associated to some form of real-space electronic order. For the cuprates, despite several proposals, the emergence of order in the phase diagram between the commensurate antiferromagnetic state and the superconducting state is not well understood. Here we show that in this regime doped holes assemble in 'electronic polymers'. Within a Monte Carlo study, we find that in clean systems by lowering the temperature the polymer melt condenses first in a smectic state and then in a Wigner crystal both with the addition of inversion symmetry breaking. Disorder blurs the positional order leaving a robust inversion symmetry breaking and a nematic order, accompanied by vector chiral spin order and with the persistence of a thermodynamic transition. Such electronic phases, whose properties are reminiscent of soft-matter physics, produce charge and spin responses in good accord with experiments.}, language = {en} }