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Two-dimensional electron gas in a modulation-doped SrTiO3/Sr(Ti, Zr)O3 heterostructure

  • Author(s): Kajdos, Adam P.
  • Ouellette, Daniel G.
  • Cain, Tyler A.
  • Stemmer, Susanne
  • et al.
Abstract

A two-dimensional electron gas (2DEG) in SrTiO3is created via modulation doping by interfacing undoped SrTiO3with a wider-band-gap material, SrTi1xZrxO3, which is doped n-type with La. All layers are grown using hybrid molecular beam epitaxy. Using magnetoresistance measurements, we show that electrons are transferred into the SrTiO3, and a 2DEG is formed. In particular, Shubnikov-de Haas oscillations are shown to depend only on the perpendicular magnetic field. Experimental Shubnikov-de Haas oscillations are compared with calculations that assume multiple occupied subbands.

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