人工一维LaAlO₃/SrTiO₃电子通道中的类舒布尼科夫-德哈斯量子振荡

Shubnikov-de Haas-like Quantum Oscillations in Artificial One-Dimensional LaAlO_{3}/SrTiO_{3} Electron Channels.

作者信息

Cheng Guanglei, Annadi Anil, Lu Shicheng, Lee Hyungwoo, Lee Jung-Woo, Huang Mengchen, Eom Chang-Beom, Irvin Patrick, Levy Jeremy

机构信息

CAS Key Laboratory of Microscale Magnetic Resonance and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China.

Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.

出版信息

Phys Rev Lett. 2018 Feb 16;120(7):076801. doi: 10.1103/PhysRevLett.120.076801.

DOI:10.1103/PhysRevLett.120.076801

PMID:29542936

Abstract

The widely reported magnetoresistance oscillations in LaAlO_{3}/SrTiO_{3} heterostructures have invariably been attributed to the Shubnikov-de Haas (SdH) effect, despite a pronounced inconsistency with low-field Hall resistance measurements. Here we report SdH-like resistance oscillations in quasi-1D electron waveguides created at the LaAlO_{3}/SrTiO_{3} interface by conductive atomic force microscopy lithography. These oscillations can be directly attributed to magnetic depopulation of magnetoelectric subbands. Our results suggest that the SdH oscillations in 2D SrTiO_{3}-based systems may originate from naturally forming quasi-1D channels.

摘要

尽管与低场霍尔电阻测量结果存在明显不一致，但在LaAlO₃/SrTiO₃异质结构中广泛报道的磁电阻振荡一直都被归因于舒布尼科夫-德哈斯（SdH）效应。在此，我们报告了通过导电原子力显微镜光刻技术在LaAlO₃/SrTiO₃界面处创建的准一维电子波导中出现的类似SdH的电阻振荡。这些振荡可直接归因于磁电子能带的磁致空穴现象。我们的结果表明，基于二维SrTiO₃的系统中的SdH振荡可能源于自然形成的准一维通道。