Two-Dimensional Superconducting Phase in LaTiO3/SrTiO3 Heterostructures Induced by High-Mobility Carrier Doping
Two-Dimensional Superconducting Phase in LaTiO3/SrTiO3 Heterostructures Induced by High-Mobility Carrier Doping
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DOI：
10.1103/physrevlett.108.247004
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发表时间：
2012-06-15
影响因子：
8.6
通讯作者：
Lesueur, J.
中科院分区：
文献类型：
--
作者：
Biscaras, J.;Bergeal, N.;Lesueur, J.
在这封信中，我们表明，超导二维电子气形成在LaTiO_3/SrTiO_3界面，其转变温度可以调制的背栅电压。气体由两种类型的载流子组成：大多数低迁移率的载流子总是存在的，和一些高迁移率的，可以通过静电掺杂注入。计算了束缚势中电子的空间分布，结果表明，导致超导的高迁移率电子位于气体的边缘，其延伸可以通过场效应来调节。
In this Letter, we show that a superconducting two-dimensional electron gas is formed at the LaTiO3/SrTiO3 interface whose transition temperature can be modulated by a back-gate voltage. The gas consists of two types of carriers: a majority of low-mobility carriers always present, and a few high-mobility ones that can be injected by electrostatic doping. The calculation of the electron spatial distribution in the confinement potential shows that the high-mobility electrons responsible for superconductivity set at the edge of the gas whose extension can be tuned by the field effect.