Circular photogalvanic effect at the surface of hydrogenated perovskite oxides

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-06-24 DOI:10.1063/5.0276787

Chengjian Li, Ying Li, Guoru Li, Jiajun Guo

引用次数: 0

Abstract

Surface electronic states represent a crucial material system for both fundamental physics research and electronic device applications. In this study, the circular photogalvanic effect (CPGE) in hydrogenated surface states was systematically investigated. Both hydrogenated SrTiO3 and KTaO3 exhibited significant photocurrents under 780, 532, and 450 nm illumination, demonstrating strong spin–orbit coupling (SOC) at the surface states. X-ray photoelectron spectroscopy measurements revealed a hydrogen density gradient near the surface, which breaks inversion symmetry and consequently induces strong SOC. The nonzero CPGE photocurrent under normal incidence and its incidence angle dependence suggest the Cs symmetry of hydrogenated SrTiO3, which can be attributed to the anisotropic hydrogen distribution within the crystal lattice.

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氢化钙钛矿氧化物表面的圆形光电效应

表面电子态是基础物理研究和电子器件应用的重要材料系统。本研究系统地研究了氢化表面态的圆形光电效应（CPGE）。氢化SrTiO3和KTaO3在780、532和450 nm光照下均表现出显著的光电流，在表面态表现出较强的自旋轨道耦合（SOC）。x射线光电子能谱测量显示，表面附近的氢密度梯度打破了反演对称性，从而产生了强荷电性。正入射下的非零CPGE光电流及其与入射角的关系表明，氢化SrTiO3具有Cs对称性，这可以归因于晶格内氢的各向异性分布。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.