近日，瑞士日内瓦大学Andrea D. Caviglia团队研究了具有自旋动量锁定电子的量子度规。这一研究成果发表在2025年8月21日出版的《科学》杂志上。
量子材料的特点是电磁响应与编码在量子度量和贝里曲率中的电子波函数的几何和拓扑结构有内在联系。尽管在一些磁性和非磁性系统中已经发现了贝里曲率介导的输运效应，但量子度量诱导的输运现象仍然局限于拓扑反铁磁体。
研究组证明了自旋-动量锁定（自旋-轨道耦合材料表面和界面电子态的一般特征）导致了有限的量子度量。该指标激活了研究组在111取向LaAlO3/SrTiO3界面中测量和电气控制的非线性平面内磁电阻。这些发现证明了量子度量效应在大量材料中的存在，并使以前未探索的策略能够基于量子几何设计功能。
附：英文原文
Title: The quantum metric of electrons with spin-momentum locking
Author: Giacomo Sala, Maria Teresa Mercaldo, Klevis Domi, Stefano Gariglio, Mario Cuoco, Carmine Ortix, Andrea D. Caviglia
Issue&Volume: 2025-08-21
Abstract: Quantum materials are characterized by electromagnetic responses intrinsically linked to the geometry and topology of electronic wavefunctions that are encoded in the quantum metric and Berry curvature. Whereas Berry curvature–mediated transport effects have been identified in several magnetic and nonmagnetic systems, quantum metric–induced transport phenomena remain limited to topological antiferromagnets. Here, we show that spin-momentum locking, a general characteristic of the electronic states at surfaces and interfaces of spin-orbit–coupled materials, leads to a finite quantum metric. This metric activates a nonlinear in-plane magnetoresistance that we measured and electrically controlled in 111-oriented LaAlO3/SrTiO3 interfaces. These findings demonstrate the existence of quantum metric effects in a vast class of materials and enable previously unexplored strategies to design functionalities based on quantum geometry.
DOI: adq3255
Source: https://www.science.org/doi/10.1126/science.adq3255