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Title: Subband structure of two-dimensional electron gases in SrTiO{sub 3}

Tunneling between two parallel, two-dimensional electron gases (2DEGs) in a complex oxide heterostructure containing a large, mobile electron density of ∼3 × 10{sup 14} cm{sup −2} is used to probe the subband structure of the 2DEGs. Temperature-dependent current-voltage measurements are performed on SrTiO{sub 3}/GdTiO{sub 3}/SrTiO{sub 3} junctions, where GdTiO{sub 3} serves as the tunnel barrier, and each interface contains a high-density 2DEG. Resonant tunneling features in the conductance and its derivative occur when subbands on either side of the barrier align in energy as the applied bias is changed, and are used to analyze subband energy spacings in the two 2DEGs. We show that the results agree substantially with recent theoretical predictions for such interfaces.
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:
22254029
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 21; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ELECTRIC POTENTIAL; ELECTRON DENSITY; OXIDES; SEMICONDUCTOR JUNCTIONS; STRONTIUM TITANATES; TEMPERATURE DEPENDENCE; TUNNEL EFFECT