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Title: Tunable bilayer two-dimensional electron gas in LaAlO{sub 3}/SrTiO{sub 3} superlattices

We report magnetotransport properties of double heterointerfaces in LaAlO{sub 3}/SrTiO{sub 3}/LaAlO{sub 3}/SrTiO{sub 3}(001) (LAO/STO/LAO/STO). A strong nonlinearity in the Hall resistivity is found when the temperature is below 80 K. This effect is attributed to multichannel conduction of interfacial charges generated in double heterostructures of LAO/STO where two-dimensional electron gas (2DEG) is produced. The multichannel conduction is confirmed by back gating modulation of Hall effect. Our result suggests the possibility to achieve coupled bilayer 2DEG layers in LAO/STO superlattices.
Authors:
; ; ;  [1] ;  [2] ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [1] ;  [2] ;  [2]
  1. NUSNNI-Nanocore, National University of Singapore, 117411 Singapore (Singapore)
  2. (Singapore)
  3. Institute of Materials Research and Engineering, Singapore 117602 (Singapore)
  4. Department of Physics, National University of Singapore, 117542 Singapore (Singapore)
Publication Date:
OSTI Identifier:
22303938
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINATES; ELECTRIC CONDUCTIVITY; ELECTRON GAS; HALL EFFECT; LANTHANUM COMPOUNDS; LAYERS; MAGNETORESISTANCE; MODULATION; NONLINEAR PROBLEMS; STRONTIUM TITANATES; SUPERLATTICES; TEMPERATURE RANGE 0013-0065 K