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Title: Two-dimensional electron gas in a modulation-doped SrTiO{sub 3}/Sr(Ti, Zr)O{sub 3} heterostructure

A two-dimensional electron gas (2DEG) in SrTiO{sub 3} is created via modulation doping by interfacing undoped SrTiO{sub 3} with a wider-band-gap material, SrTi{sub 1−x}Zr{sub x}O{sub 3}, 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 SrTiO{sub 3}, 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.
Authors:
; ;  [1] ;  [2]
  1. Materials Department, University of California, Santa Barbara, California 93106-5050 (United States)
  2. Department of Physics, University of California, Santa Barbara, California 93106-9530 (United States)
Publication Date:
OSTI Identifier:
22218134
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 8; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPARATIVE EVALUATIONS; DOPED MATERIALS; ELECTRON GAS; ELECTRONS; LANTHANUM; LAYERS; MAGNETIC FIELDS; MAGNETORESISTANCE; MODULATION; MOLECULAR BEAM EPITAXY; OSCILLATIONS; OZONE; SEMICONDUCTOR MATERIALS; SHUBNIKOV-DE HAAS EFFECT; STRONTIUM TITANATES; THIN FILMS; TWO-DIMENSIONAL CALCULATIONS