论文标题
通过多轨氧化物的量子点接触的弹道传输
Ballistic transport through quantum point contacts of multi-orbital oxides
论文作者
论文摘要
使用紧密结合方法和$ \ mathbf {k \ cdot p} $接近，通过基于氧化物的二维电子气体通过原子尺寸点接触进行线性和非线性传输属性。通过使用Landauer-büttiker方法，在带绝缘子$ LAALO_3 $和$ SRTIO_3 $之间在（001）接口中分析弹道运输，用于用于许多从三个Ti 3d orbitals得出的子带（$ d_ {yz} $，$ d_ {zx} $ d_ {磁场。我们特别关注原子旋转轨道耦合的作用和反转对称性打破术语，指出了三个运输方式：第一个，低能量，涉及第一个$ d_ {xy} $ - 像子频段一样，导电量化是强大的；第二个，在中间能量中，需要进一步的$ d_ {xy} $ - 像子频段一样，磁场引起的子带分裂被淬灭；第三个，其中light $ d_ {xy} $之间的混合 - 喜欢，重$ d_ {yz} $ - 喜欢和$ d_ {zx} $ - 喜欢子频段非常强，以至于电导高原的电导量很狭窄。在最近的实验中发现了非常良好的一致性，该实验探讨了低能能下的运输特性。
Linear and non-linear transport properties through an atomic-size point contact based on oxides two-dimensional electron gas is examined using the tight-binding method and the $\mathbf{k\cdot p}$ approach. The ballistic transport is analyzed in contacts realized at the (001) interface between band insulators $LaAlO_3$ and $SrTiO_3$ by using the Landauer-Büttiker method for many sub-bands derived from three Ti 3d orbitals ($d_{yz}$, $d_{zx}$ and $d_{xy}$) in the presence of an out-of-plane magnetic field. We focus especially on the role played by the atomic spin-orbit coupling and the inversion symmetry breaking term pointing out three transport regimes: the first, at low energies, involving the first $d_{xy}$-like sub-bands, where the conductance quantization is robust; a second one, at intermediate energies, entailing further $d_{xy}$-like sub-bands, where the sub-band splitting induced by the magnetic field is quenched; the third one, where the mixing between light $d_{xy}$-like, heavy $d_{yz}$-like and $d_{zx}$-like sub-bands is so strong that the conductance plateaus turn out to be very narrow. Very good agreement is found with recent experiments exploring the transport properties at low energies.
