Skip to main content
Open Access Publications from the University of California

Electrostatic carrier doping of GdTiO3/SrTiO3 interfaces

  • Author(s): Moetakef, Pouya
  • Cain, Tyler
  • Ouellette, Daniel
  • Zhang, Jack
  • Klenov, Dmitri
  • Janotti, Anderson
  • Van de Walle, Chris
  • Rajan, Siddharth
  • Allen, S. James
  • Stemmer, Susanne
  • et al.

Heterostructures and superlattices consisting of a prototype Mott insulator, GdTiO3, and the band insulator SrTiO3 are grown by molecular beam epitaxy and show intrinsic electronic reconstruction, approximately ½ electron per surface unit cell at each GdTiO3/SrTiO3 interface. The sheet carrier densities in all structures containing more than one unit cell of SrTiO3 are independent of layer thicknesses and growth sequences, indicating that the mobile carriers are in a high concentration, two-dimensional electron gas bound to the interface. These carrier densities closely meet the electrostatic requirements for compensating the fixed charge at these polar interfaces. Based on the experimental results, insights into interfacial band alignments, charge distribution, and the influence of different electrostatic boundary conditions are obtained.

Many UC-authored scholarly publications are freely available on this site because of the UC Academic Senate's Open Access Policy. Let us know how this access is important for you.

Main Content
Current View