title: Interface engineering of quantum Hall effects in digital transition metal oxide heterostructures.
abstract: Topological insulators are characterized by a non-trivial band topology driven by the spin-orbit coupling. To fully explore the fundamental science and application of topological insulators, material realization is indispensable. Here we predict, based on tight-binding modelling and first-principles calculations, that bilayers of perovskite-type transition-metal oxides grown along the [111] crystallographic axis are potential candidates for two-dimensional topological insulators. The topological band structure of these materials can be fine-tuned by changing dopant ions, substrates and external gate voltages. We predict that LaAuO(3) bilayers have a topologically non-trivial energy gap of about 0.15 eV, which is sufficiently large to realize the quantum spin Hall effect at room temperature. Intriguing phenomena, such as fractional quantum Hall effect, associated with the nearly flat topologically non-trivial bands found in e(g) systems are also discussed.
authors.affiliation: Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. xiaod@ornl.gov
authors.forename: Di
authors.initials: D
authors.lastname: Xiao
authors.forename: Wenguang
authors.initials: W
authors.lastname: Zhu
authors.forename: Ying
authors.initials: Y
authors.lastname: Ran
authors.forename: Naoto
authors.initials: N
authors.lastname: Nagaosa
authors.forename: Satoshi
authors.initials: S
authors.lastname: Okamoto
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D003460:Crystallization; D004581:Electronics / Q000379:methods*; D004738:Engineering / Q000379:methods*; D007811:Lanthanum / Q000737:chemistry; D008962:Models, Theoretical; D010087:Oxides / Q000737:chemistry*; D011789:Quantum Theory; D014025:Titanium / Q000737:chemistry*; D028561:Transition Elements / Q000737:chemistry
chemical_list: D017610:Calcium Compounds; D010087:Oxides; D028561:Transition Elements; C059910:perovskite; D007811:Lanthanum; D014025:Titanium