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

Journal Article · Mon Jul 07 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4887235· OSTI ID:22303938

Ma, H. J. Harsan,; Annadi, A.; Zeng, S. W.; Ariando, ^[1]; Huang, Z.; Lü, W. M. ^[1]; Wong, L. M. ^[2]; Wang, S. J. ^[3]; Venkatesan, T. ^[1]

---

1. NUSNNI-Nanocore, National University of Singapore, 117411 Singapore (Singapore)
2. Institute of Materials Research and Engineering, Singapore 117602 (Singapore)
3. Department of Physics, National University of Singapore, 117542 Singapore (Singapore)

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.

• OSTI ID: 22303938
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 1 Vol. 105; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

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