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Quantum confined two-dimensional electron/hole gas switching by facet orientation of perovskite oxides

机译：钙钛矿氧化物小平面取向的量子约束二维电子/空穴气体转换

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The Polar discontinuity at heterointerface and the bare surface reconstructs the electronic phase of perovskite oxides. This gives rise to confined free electrons which intrinsically transit material from band insulator to metal. However, the insulator–metal transition induced by free holes has not been investigated so far due to the challenge in obtaining free hole state in oxides. Here, we propose a simple method whereby free holes can be obtained via polar facet reorientation. In the high polarity case, free holes can be supported by the lift up of O 2p subbands, which split into three independent subbands (one heavy hole subband and two light hole subbands) due to strong quantum confinement. Results show that both of the free electron and hole states are confined in a two dimensional quantum well, subjecting to the confined energy ( E ? E _(F) ) and occupied density of states around the Fermi level, indicating a finite thickness for preserving the metal states.
机译：异质界面和裸露表面的极性不连续性重构了钙钛矿氧化物的电子相。这产生了受限的自由电子，该自由电子本质上使材料从带绝缘子过渡到金属。然而，由于在氧化物中获得自由孔态的挑战，到目前为止，尚未研究由自由孔引起的绝缘体-金属过渡。在这里，我们提出了一种简单的方法，可以通过极性小面重新定向获得自由孔。在高极性情况下，可以通过提升O 2p子带来支持自由空穴，这些子带由于强的量子限制而分为三个独立的子带（一个重空穴子带和两个轻空穴子带）。结果表明，自由电子态和空穴态都被限制在二维量子阱中，受制于有限的能量（E？E _（F））和费米能级附近的态占据密度，这表明了用于保存的有限厚度金属状态。

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