Quantum metric nonlinear Hall effect in a topological antiferromagnetic heterostructure
Quantum metric nonlinear Hall effect in a topological antiferromagnetic heterostructure
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DOI：
10.1126/science.adf1506
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发表时间：
2023-06
期刊：
影响因子：
56.9
通讯作者：
Anyuan Gao;Yu-Fei Liu;Jian-Xiang Qiu;B. Ghosh;Thaís V Trevisan;Y. Onishi;Chaowei Hu;Tiema Qian;Hung-Ju Tien;Shaojuan Chen;Mengqi Huang;Damien Bérubé;Houchen Li;C. Tzschaschel;T. Dinh;Zhengyuan Sun;Sheng-Chin Ho;S. Lien;Bahadur Singh;Kenji Watanabe;T. Taniguchi;D. Bell;Hsin Lin;Tay-Rong Chang;C. Du;A. Bansil;L. Fu;Ni Ni-Ni;P. P. Orth-P.;Qiong Ma;Su-Yang Xu
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作者：
Anyuan Gao;Yu-Fei Liu;Jian-Xiang Qiu;B. Ghosh;Thaís V Trevisan;Y. Onishi;Chaowei Hu;Tiema Qian;Hung-Ju Tien;Shaojuan Chen;Mengqi Huang;Damien Bérubé;Houchen Li;C. Tzschaschel;T. Dinh;Zhengyuan Sun;Sheng-Chin Ho;S. Lien;Bahadur Singh;Kenji Watanabe;T. Taniguchi;D. Bell;Hsin Lin;Tay-Rong Chang;C. Du;A. Bansil;L. Fu;Ni Ni-Ni;P. P. Orth-P.;Qiong Ma;Su-Yang Xu
凝聚态物理中的量子几何有两个组成部分：真实的部分量子度规和虚部贝瑞曲率。虽然贝瑞曲率的影响已经通过二维电子气中的量子霍尔效应和铁磁体中的反常霍尔效应（AHE）等现象观察到，但量子度规很少被探索。在这里，我们报告了一个非线性霍尔效应引起的量子力学偶极子接口均匀层状MnBi 2 Te 4与黑磷。量子度规非线性霍尔效应在反转反铁磁（AFM）自旋时切换方向，并表现出与散射时间无关的明显标度。我们的研究结果打开了大门，发现理论上预测的量子度规响应，并铺平了道路，桥梁非线性电子学与AFM自旋电子学的应用。描述编辑摘要量子度规是对量子系统中相邻波函数之间距离的量化，它被预测会影响许多物理响应。一个例子是预测的非线性异常霍尔效应的反铁磁体与特定的对称性。Gao等人在由偶数层材料MnBi 2 Te 4与黑磷界面组成的结构中观察到这种效应。研究人员通过仔细排除其他解释得出了他们的结论。结果建立了系统作为一个可行的设置研究量子度规的影响。-JS在由与黑磷接合的均匀层状MnBi 2 Te 4组成的结构中观察到非线性响应。
Quantum geometry in condensed-matter physics has two components: the real part quantum metric and the imaginary part Berry curvature. Whereas the effects of Berry curvature have been observed through phenomena such as the quantum Hall effect in two-dimensional electron gases and the anomalous Hall effect (AHE) in ferromagnets, the quantum metric has rarely been explored. Here, we report a nonlinear Hall effect induced by the quantum metric dipole by interfacing even-layered MnBi2Te4 with black phosphorus. The quantum metric nonlinear Hall effect switches direction upon reversing the antiferromagnetic (AFM) spins and exhibits distinct scaling that is independent of the scattering time. Our results open the door to discovering quantum metric responses predicted theoretically and pave the way for applications that bridge nonlinear electronics with AFM spintronics. Description Editor’s summary The quantum metric, which quantifies the distance between neighboring wavefunctions in a quantum system, has been predicted to affect many physical responses. One example is the predicted nonlinear anomalous Hall effect in antiferromagnets with particular symmetries. Gao et al. observed this effect in a structure consisting of an even number of layers of the material MnBi2Te4 interfaced with black phosphorus. The researchers reached their conclusions by carefully ruling out alternative interpretations. The results establish the system as a viable setting for studying the effects of the quantum metric. —JS A nonlinear response was observed in a structure consisting of even-layered MnBi2Te4 interfaced with black phosphorus.