title: Mott Electrons in an Artificial Graphenelike Crystal of Rare-Earth Nickelate.
abstract: Deterministic control over the periodic geometrical arrangement of the constituent atoms is the backbone of the material properties, which, along with the interactions, define the electronic and magnetic ground state. Following this notion, a bilayer of a prototypical rare-earth nickelate, NdNiO_{3}, combined with a dielectric spacer, LaAlO_{3}, has been layered along the pseudocubic [111] direction. The resulting artificial graphenelike Mott crystal with magnetic 3d electrons has antiferromagnetic correlations. In addition, a combination of resonant X-ray linear dichroism measurements and ab initio calculations reveal the presence of an ordered orbital pattern, which is unattainable in either bulk nickelates or nickelate based heterostructures grown along the [001] direction. These findings highlight another promising venue towards designing new quantum many-body states by virtue of geometrical engineering.
authors.affiliation: Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.
authors.forename: S
authors.initials: S
authors.lastname: Middey
authors.affiliation: Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.
authors.forename: D
authors.initials: D
authors.lastname: Meyers
authors.affiliation: Department of Earth and Environmental Sciences and Center of Nanoscience, University of Munich, Munich D-80333, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Doennig
authors.affiliation: Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.
authors.forename: M
authors.initials: M
authors.lastname: Kareev
authors.affiliation: Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.
authors.forename: X
authors.initials: X
authors.lastname: Liu
authors.affiliation: Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Cao
authors.affiliation: Beijing National Laboratory for Condensed-Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Zhenzhong
authors.initials: Z
authors.lastname: Yang
authors.affiliation: Beijing National Laboratory for Condensed-Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Jinan
authors.initials: J
authors.lastname: Shi
authors.affiliation: Beijing National Laboratory for Condensed-Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.|Collaborative Innovation Center of Quantum Matter, Beijing 100190, People's Republic of China.
authors.forename: Lin
authors.initials: L
authors.lastname: Gu
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: P J
authors.initials: PJ
authors.lastname: Ryan
authors.affiliation: Department of Earth and Environmental Sciences and Center of Nanoscience, University of Munich, Munich D-80333, Germany.|Department of Physics, University of Duisburg-Essen, Duisburg D-47057, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Pentcheva
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: J W
authors.initials: JW
authors.lastname: Freeland
authors.affiliation: Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.
authors.forename: J
authors.initials: J
authors.lastname: Chakhalian