286 citations · 1k across the 16 of their papers we have counts for
16 papers
Olympicene radicals as building blocks of two-dimensional anisotropic networks
Ricardo Ortiz
I propose monoradical nanographenes without C3 symmetry as building blocks to design two-dimensional (2D) carbon crystals. As representative examples I study the honeycomb and Kago…
Bistability between -diradical open-shell and closed-shell states in indeno[1,2-a]fluorene
Shantanu Mishra, Manuel Vilas-Varela, Leonard-Alexander Lieske +7
Indenofluorenes are non-benzenoid conjugated hydrocarbons that have received great interest owing to their unusual electronic structure and potential applications in non-linear opt…
Magnetic frustration and fractionalization in oligo(indenoindenes)
Ricardo Ortiz, Geza Giedke, Thomas Frederiksen
Poly(indenoindenes) are π-conjugated ladder carbon polymers with alternating hexagons and pentagons hosting one unpaired electron for each five-membered ring in the open-shell limi…
Theory of triangulene two-dimensional crystals
R. Ortiz, G. Catarina, J. Fernández-Rossier
Equilateral triangle-shaped graphene nanoislands with a lateral dimension of benzene rings are known as triangulenes. Individual triangulenes are open-shell molecules…
Frustrated magnetic interactions in a cyclacene crystal
R. Ortiz, J. C. Sancho-García, J. Fernández-Rossier
We study the emergence of magnetism and its interplay with structural properties in a two dimensional molecular crystal of cyclacenes, using density functional theory (DFT). Isolat…
Observation of fractional edge excitations in nanographene spin chains
Shantanu Mishra, Goncalo Catarina, Fupeng Wu +9
Fractionalization is a phenomenon in which strong interactions in a quantum system drive the emergence of excitations with quantum numbers that are absent in the building blocks. O…
Renormalization of spin excitations and Kondo effect in open shell nanographenes
David Jacob, Ricardo Ortiz, Joaquín Fernández-Rossier
We study spin excitations and Kondo effect in open-shell nanographenes, motivated by recent scanning tunneling inelastic spectroscopy experiments. Specifically, we consider three s…
A superlattice approach to doping infinite-layer nickelates
R. A. Ortiz, H. Menke, F. Misják +8
The recent observation of superconductivity in infinite-layer NdSrNiO thin films has attracted a lot of attention, since this compound is electronically and structu…
Giant magnetic exchange coupling in rhombus-shaped nanographenes with zigzag periphery
Shantanu Mishra, Xuelin Yao, Qiang Chen +11
Nanographenes with zigzag edges are predicted to manifest non-trivial pi-magnetism resulting from the interplay of hybridization of localized frontier states and Coulomb repulsion…
Collective All-Carbon Magnetism in Triangulene Dimers
Shantanu Mishra, Doreen Beyer, Kristjan Eimre +8
Triangular zigzag nanographenes, such as triangulene and its pi-extended homologues, have received widespread attention as organic nanomagnets for molecular spintronics, and may se…
Probing local moments in nanographenes with electron tunneling spectroscopy
Ricardo Ortiz, Joaquín Fernández-Rossier
The emergence of local moments in graphene zigzag edges, grain boundaries, vacancies and sp3 defects has been widely studied theoretically. However, conclusive experimental evidenc…
Emergent quantum matter in graphene nanoribbons
J. L. Lado, R. Ortiz, J. Fernandez-Rossier
In this book chapter, we introduce different schemes to create quantum states of matter in engineered graphene nanoribbons. We will focus on the emergence of controllable magnetic…
Exchange rules for diradical π-conjugated hydrocarbons
Ricardo Ortiz, Roberto Álvarez Boto, Noel García-Martínez +3
A variety of planar π-conjugated hydrocarbons such as heptauthrene, Clar's goblet and, recently synthesized, triangulene have two electrons occupying two degenerate molecular orbit…
Resonant inelastic x-ray scattering study of bond order and spin excitations in nickelate thin-film structures
K. Fürsich, Y. Lu, D. Betto +13
We used high-resolution resonant inelastic x-ray scattering (RIXS) at the Ni edge to simultaneously investigate high-energy interband transitions characteristic of Ni-O bond…
Stabilization of three-dimensional charge order in YBaCuO via epitaxial growth
M. Bluschke, A. Frano, E. Schierle +12
Incommensurate charge order (CO) has been identified as the leading competitor of high-temperature superconductivity in all major families of layered copper oxides, but the perplex…
Electrical spin manipulation in graphene nanostructures
R. Ortiz, N. A. García-Martínez, J. L. Lado +1
We propose a mechanism to drive singlet-triplet spin transitions electrically, in a wide class of graphene nanostructures that present pairs of in-gap zero modes, localized at oppo…