Time-Reversal Symmetry Protected Transport at Correlated Oxide Interfaces

Mengke Ha; Qing Xiao; Zhiyuan Qin; Dawei Qiu; Longbing Shang; Xinyi Liu; Pu Yan; Changjian Ma; Danqing Liu; Chengyuan Huang; Zhenlan Chen; Haoyuan Wang; Chang-Kui Duan; Zhaoliang Liao; Wei-Tao Liu; Yang Gao; Kecheng Cao; Jiangfeng Du; Guanglei Cheng

arXiv · 2505.02243

Time-Reversal Symmetry Protected Transport at Correlated Oxide Interfaces

Mengke Ha·Qing Xiao·Zhiyuan Qin·Dawei Qiu·Longbing Shang·Xinyi Liu·Pu Yan·Changjian Ma·Danqing Liu·Chengyuan Huang·Zhenlan Chen·Haoyuan Wang·Chang-Kui Duan·Zhaoliang Liao·Wei-Tao Liu·Yang Gao·Kecheng Cao·Jiangfeng Du·Guanglei Cheng

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Abstract

Time-reversal symmetry (TRS) protection is core to topological physics, yet its role in correlated oxides-typically non-topological-remains underexplored. This limit hampers the potential in engineering exotic quantum states by fusing TRS protection and the rich emergent phenomena in the oxide platform. Here, we report evidence of a TRS-protected subband at oxygen vacancy-free LaAlO3/SrTiO3 interfaces. This subband causes a low-field quantum oscillation with anomalous characters: exceptionally light electron mass, aperiodicity, and susceptibility to magnetic fields. All findings align with a Rashba model in which TRS-protected transport occurs along quasi-1D ferroelastic domain walls, which possess a Dirac band topology and a giant Rashba spin-orbit coupling, two orders stronger than the 2D interface. Our results deepen the understanding of SrTiO3-based electron systems, unveiling an appealing new platform for quantum engineering.

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Mengke Ha, Qing Xiao, Zhiyuan Qin, Dawei Qiu, Longbing Shang, Xinyi Liu, Pu Yan, Changjian Ma, Danqing Liu, Chengyuan Huang, Zhenlan Chen, Haoyuan Wang, Chang-Kui Duan, Zhaoliang Liao, Wei-Tao Liu, Yang Gao, Kecheng Cao, Jiangfeng Du, Guanglei Cheng. 2025-05-04. Time-Reversal Symmetry Protected Transport at Correlated Oxide Interfaces. https://arxiv.org/abs/2505.02243

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