Magnetic and Nematic Orders of the Two-Dimensional Electron Gas at Oxide (111) Surfaces and Interfaces

被引：13
|
作者：
Boudjada, Nazim [1 ]
Wachtel, Gideon [1 ]
Paramekanti, Arun [1 ]
机构：
[1] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada
来源：
PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 08期
基金：
加拿大自然科学与工程研究理事会;
关键词：
PHASE; SUPERCONDUCTIVITY; COEXISTENCE; TRANSITION; REGIME;
D O I：
10.1103/PhysRevLett.120.086802
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Recent experiments have explored two-dimensional electron gases (2DEGs) at oxide (111) surfaces and interfaces, finding evidence for hexagonal symmetry breaking in SrTiO3 at low temperature. We discuss many-body instabilities of such (111) 2DEGs, incorporating multiorbital interactions in the t(2g) manifold which can induce diverse magnetic and orbital orders. Such broken symmetries may partly account for the observed nematicity, cooperating or competing with phonon mechanisms. We present an effective field theory for the interplay of magnetism and nematic charge order, and discuss implications of the nematicity for transport and superconductivity in (111) 2DEGs.
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页数：7
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