Mott Electrons in an Artificial Graphenelike Crystal of Rare-Earth Nickelate

Physical Review Letters
S MiddeyJak Chakhalian

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.

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Citations

Jun 22, 2016·Scientific Reports·D MeyersJ Chakhalian
Jun 20, 2017·Advanced Materials·Er-Jia GuoMichael R Fitzsimmons
Dec 22, 2017·Reports on Progress in Physics·S CatalanoJ Kreisel
May 15, 2018·Physical Review Letters·S MiddeyJ Chakhalian
Feb 23, 2021·Nano Letters·Xiaoran LiuJak Chakhalian
Oct 24, 2019·Nano Letters·Arian ArabAlexander X Gray

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