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arXiv 1502.07561cond-mat.mes-hallcond-mat.supr-con
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氧化物界面电子相分离的可能机制

Possible mechanisms of electronic phase separation in oxide interfaces

N. Bovenzi, F. Finocchiaro, N. Scopigno, D. Bucheli, S. Caprara, G. Seibold, M. Grilli

摘要:

已知LaAlO 3/SrTiO 3和LaTiO 3/SrTiO 3界面具有强不均匀(几乎)二维电子气(2DEG)。在这项工作中,我们提出了三个非常规的电子机制的电子相分离(EPS)在2DEG作为一个可能的来源,在氧化物界面的不均匀性。所有三种机制的共同点是一些(相互作用)势对2DEG密度的依赖性。我们首先考虑一个相当大的密度依赖Rashba自旋轨道耦合的机制。其次,我们指出,EPS也可能发生在密度依赖的超导配对相互作用的情况下。最后,我们表明,由密度相关的,自洽的静电势的界面的二维电子气的限制本身可以引起EPS。

英文摘要:

LaAlO3/SrTiO3 ad LaTiO3/SrTiO3 interfaces are known to host a strongly inhomogeneous (nearly) two-dimensional electron gas (2DEG). In this work we present three unconventional electronic mechanisms of electronic phase separation (EPS) in a 2DEG as a possible source of inhomogeneity in oxide interfaces. Common to all three mechanisms is the dependence of some (interaction) potential on the 2DEG's density. We first consider a mechanism resulting from a sizable density-dependent Rashba spin-orbit coupling. Next, we point out that an EPS may also occur in the case of a density-dependent superconducting pairing interaction. Finally, we show that the confinement of the 2DEG to the interface by a density-dependent, self-consistent electrostatic potential can by itself cause an EPS.

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