| Autor: |
Cheng, Guanglei, Veazey, Joshua P., Irvin, Patrick, Cen1, Cheng, Bogorin1, Daniela F., Bi, Feng, Huang, Mengchen, Lu, Shicheng, Bark, Chung-Wung, Ryu, Sangwoo, Cho, Kwang-Hwan, Eom, Chang-Beom, Levy, Jeremy |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
Phys. Rev. X 3, 011021 (2013) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevX.3.011021 |
| Popis: |
The oxide heterostructure LaAlO3/SrTiO3 supports a two-dimensional electron liquid with a variety of competing phases including magnetism, superconductivity and weak antilocalization due to Rashba spin-orbit coupling. Further confinement of this 2D electron liquid to the quasi-one-dimensional regime can provide insight into the underlying physics of this system and reveal new behavior. Here we describe magnetotransport experiments on narrow LaAlO3/SrTiO3 structures created by a conductive atomic force microscope lithography technique. Four-terminal local transport measurements on ~10-nm-wide Hall bar structures yield longitudinal resistances that are comparable to the resistance quantum h/e2 and independent of the channel length. Large nonlocal resistances (as large as 10^4 ohms) are observed in some but not all structures with separations between current and voltage that are large compared to the 2D mean-free path. The nonlocal transport is strongly suppressed by the onset of superconductivity below ~200 mK. The origin of these anomalous transport signatures is not understood, but may arise from coherent transport defined by strong spin-orbit coupling and/or magnetic interactions. |
| Databáze: |
arXiv |
| Externí odkaz: |
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