Anisotropic electronic transport of the two-dimensional electron system in Al2O3/SrTiO3 heterostructures

Anisotropic electronic transport of the two-dimensional electron system in Al2O3/SrTiO3... Transport measurements on the two-dimensional electron system in Al2O3/SrTiO3 heterostructures indicate significant noncrystalline anisotropic behavior below T≈30K. Lattice dislocations in SrTiO3 and interfacial steps are suggested to be the main sources for electronic anisotropy. Anisotropic defect scattering likewise alters magnetoresistance at low temperature remarkably and influences spin-orbit coupling significantly by the Elliot-Yafet mechanism of spin relaxation, resulting in anisotropic weak localization. Applying a magnetic field parallel to the interface results in an additional field-induced anisotropy of the conductance, which can be attributed to Rashba spin-orbit interaction. Compared to LaAlO3/SrTiO3, Rashba coupling seems to be reduced, indicating a weaker polarity in Al2O3/SrTiO3 heterostructures. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Anisotropic electronic transport of the two-dimensional electron system in Al2O3/SrTiO3 heterostructures

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Anisotropic electronic transport of the two-dimensional electron system in Al2O3/SrTiO3 heterostructures

Abstract

Transport measurements on the two-dimensional electron system in Al2O3/SrTiO3 heterostructures indicate significant noncrystalline anisotropic behavior below T≈30K. Lattice dislocations in SrTiO3 and interfacial steps are suggested to be the main sources for electronic anisotropy. Anisotropic defect scattering likewise alters magnetoresistance at low temperature remarkably and influences spin-orbit coupling significantly by the Elliot-Yafet mechanism of spin relaxation, resulting in anisotropic weak localization. Applying a magnetic field parallel to the interface results in an additional field-induced anisotropy of the conductance, which can be attributed to Rashba spin-orbit interaction. Compared to LaAlO3/SrTiO3, Rashba coupling seems to be reduced, indicating a weaker polarity in Al2O3/SrTiO3 heterostructures.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.95.245132
Publisher site
See Article on Publisher Site

Abstract

Transport measurements on the two-dimensional electron system in Al2O3/SrTiO3 heterostructures indicate significant noncrystalline anisotropic behavior below T≈30K. Lattice dislocations in SrTiO3 and interfacial steps are suggested to be the main sources for electronic anisotropy. Anisotropic defect scattering likewise alters magnetoresistance at low temperature remarkably and influences spin-orbit coupling significantly by the Elliot-Yafet mechanism of spin relaxation, resulting in anisotropic weak localization. Applying a magnetic field parallel to the interface results in an additional field-induced anisotropy of the conductance, which can be attributed to Rashba spin-orbit interaction. Compared to LaAlO3/SrTiO3, Rashba coupling seems to be reduced, indicating a weaker polarity in Al2O3/SrTiO3 heterostructures.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jun 26, 2017

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