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Control of electronic conduction at an oxide heterointerface using surface polar adsorbates
Yanwu Xie1, Yasuyuki Hikita, Christopher Bell
1Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba, Japan.
Nature Communications
|October 13, 2011
Summary
Polar solvents like acetone and ethanol alter conductivity at LaAlO(3)/SrTiO(3) interfaces, inducing insulator-to-metal transitions. This confirms a polarization-facilitated electronic transfer mechanism, crucial for understanding oxide interfaces.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Surface Science
Background:
- The LaAlO(3)/SrTiO(3) interface exhibits unique electronic properties, including emergent conductivity.
- A proposed link exists between the LaAlO(3) surface state and the buried SrTiO(3) conductivity.
Purpose of the Study:
- To investigate the impact of common laboratory solvents on the LaAlO(3)/SrTiO(3) interface conductivity.
- To explore the role of solvent polarity in modulating interface electronic properties.
Main Methods:
- Surface adsorption of various solvents (e.g., acetone, ethanol, water) onto LaAlO(3)/SrTiO(3) heterostructures.
- Electrical conductivity measurements of the interface before and after solvent application.
- Analysis of the insulator-to-metal transition in relation to solvent properties and LaAlO(3) thickness.
Main Results:
- Adsorption of polar solvents significantly alters the interface conductivity.
- An insulator-to-metal transition is observed near the critical LaAlO(3) thickness upon polar solvent application.
- Non-polar solvents do not induce significant changes in conductivity.
Conclusions:
- Polar solvents play a critical role in modulating the electronic properties of the LaAlO(3)/SrTiO(3) interface.
- The observed phenomenon provides experimental evidence for a general polarization-facilitated electronic transfer mechanism.
- This understanding is vital for controlling and utilizing oxide interfaces in electronic devices.
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