Spin responses and effective Hamiltonian for the two-dimensional electron gas at the oxide interface LaAlO 3 /SrTiO 3
Spin responses and effective Hamiltonian for the two-dimensional electron gas at the oxide interface LaAlO 3 /SrTiO 3
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氧化物界面LaAlO 3 /SrTiO 3 二维电子气的自旋响应和有效哈密顿量
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Di Xiao
中科院分区：
文献类型：
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作者：
Jianhui Zhou;Wen;Di Xiao
氧化物界面LaAlO_{3}/SrTiO_{3}}$上二维电子气（2DEG）的强Rashba自旋轨道耦合（SOC）是各种奇异物理现象的基础，但其性质仍存在争议。我们导出了氧化物界面$mathrm{LaAlO_{3}/SrTiO_{3}}$上二维电子气的有效哈密顿量，并发现了$d_{xz}$和$d_{yz}$轨道上不同的各向异性Rashba SOC。这种各向异性的Rashba SOC导致各向异性的静态自旋磁化率和自旋霍尔电导率的独特行为。这些独特的自旋响应可以用来确定Rashba SOC的实验性质，并阐明2DEG的轨道起源。
Strong Rashba spin-orbit coupling (SOC) of the two-dimensional electron gas (2DEG) at the oxide interface $mathrm{LaAlO_{3}/SrTiO_{3}}$ underlies a variety of exotic physics, but its nature is still under debate. We derive an effective Hamiltonian for the 2DEG at the oxide interface $mathrm{LaAlO_{3}/SrTiO_{3}}$ and find a different anisotropic Rashba SOC for the $d_{xz}$ and $d_{yz}$ orbitals. This anisotropic Rashba SOC leads to anisotropic static spin susceptibilities and also distinctive behavior of the spin Hall conductivity. These unique spin responses may be used to determine the nature of the Rashba SOC experimentally and shed light on the orbital origin of the 2DEG.