Interfaces in heterostructures possess inherent inversion asymmetry and display diverse physical effects, however, the pristine in-plane mirror symmetries of the constituent layers are usually preserved at the interface. On-demand manipulation of these symmetries remains challenging. Here, we demonstrate a strategy to control the in-plane mirror symmetries of interfaces by engineering the crystallographic orientation of heterostructures. We design a workhorse system with a new orientation, i.e., the LaAlO3/SrTiO3 heterostructure with metallic interfaces in the (112)-plane. Such a high index orientation leads to the breaking of all the pristine mirror symmetries except the mirror plane perpendicular to the <InlineEquation ID="IEq1"> <EquationSource Format="TEX">$[1\bar{1}0]$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo>[</mo> <mrow> <mn>1</mn> <mover accent="true"> <mrow> <mn>1</mn> </mrow> <mo>¯</mo> </mover> <mn>0</mn> </mrow> <mo>]</mo> </mrow> </math></EquationSource> </InlineEquation> direction (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">${M}_{[1\bar{1}0]}$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mrow> <mi>M</mi> </mrow> <mrow> <mrow> <mo>[</mo> <mrow> <mn>1</mn> <mover accent="true"> <mrow> <mn>1</mn> </mrow> <mo>¯</mo> </mover> <mn>0</mn> </mrow> <mo>]</mo> </mrow> </mrow> </msub> </math></EquationSource> </InlineEquation>), resulting in the Cs point symmetry with a metallic conduction. Consequently, this interface exhibits a giant nonlinear Hall effect characterized by a large Berry curvature dipole, a circular photogalvanic effect, and current-induced out-of-plane magnetization, all functional at room temperature. The magnitude of the nonlinear Hall effect rivals the Weyl and Dirac systems. Our work establishes a new strategy in exploring emerging electronic properties with nontrivial quantum geometry by designing the interface symmetry.

Magnetization generation and giant nonlinear transport at symmetry-engineered interfaces

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2026年1月9日

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Hang-Bo Zhang,
Zhen-Yu Ding,
Yi-Ning Xie,
Zheng-Hao Li,
Eoin Moynihan,
Ana M. Sanchez,
WenGuang Zhu,
Yang Gao,
Yoshihiro Iwasa,
Marin Alexe,
Ming-Min Yang

摘要

Interfaces in heterostructures possess inherent inversion asymmetry and display diverse physical effects, however, the pristine in-plane mirror symmetries of the constituent layers are usually preserved at the interface. On-demand manipulation of these symmetries remains challenging. Here, we demonstrate a strategy to control the in-plane mirror symmetries of interfaces by engineering the crystallographic orientation of heterostructures. We design a workhorse system with a new orientation, i.e., the LaAlO₃/SrTiO₃ heterostructure with metallic interfaces in the (112)-plane. Such a high index orientation leads to the breaking of all the pristine mirror symmetries except the mirror plane perpendicular to the $[1\bar{1}0]$ $[1 \bar{1} 0]$ direction ( ${M}_{[1\bar{1}0]}$ $M_{[1 \bar{1} 0]}$ ), resulting in the C_s point symmetry with a metallic conduction. Consequently, this interface exhibits a giant nonlinear Hall effect characterized by a large Berry curvature dipole, a circular photogalvanic effect, and current-induced out-of-plane magnetization, all functional at room temperature. The magnitude of the nonlinear Hall effect rivals the Weyl and Dirac systems. Our work establishes a new strategy in exploring emerging electronic properties with nontrivial quantum geometry by designing the interface symmetry.