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Evidence for magnetic Weyl fermions in a correlated metal
Nature Materials ( IF 41.2 ) Pub Date : 2017-09-25 , DOI: 10.1038/nmat4987
K. Kuroda , T. Tomita , M.-T. Suzuki , C. Bareille , A. A. Nugroho , P. Goswami , M. Ochi , M. Ikhlas , M. Nakayama , S. Akebi , R. Noguchi , R. Ishii , N. Inami , K. Ono , H. Kumigashira , A. Varykhalov , T. Muro , T. Koretsune , R. Arita , S. Shin , Takeshi Kondo , S. Nakatsuji

Weyl fermions1,2,3 have been observed as three-dimensional, gapless topological excitations in weakly correlated, inversion-symmetry-breaking semimetals4,5. However, their realization in spontaneously time-reversal-symmetry-breaking phases of strongly correlated materials has so far remained hypothetical2,6,7. Here, we report experimental evidence for magnetic Weyl fermions in Mn3Sn, a non-collinear antiferromagnet that exhibits a large anomalous Hall effect, even at room temperature8. Detailed comparison between angle-resolved photoemission spectroscopy (ARPES) measurements and density functional theory (DFT) calculations reveals significant bandwidth renormalization and damping effects due to the strong correlation among Mn 3d electrons. Magnetotransport measurements provide strong evidence for the chiral anomaly of Weyl fermions—namely, the emergence of positive magnetoconductance only in the presence of parallel electric and magnetic fields. Since weak magnetic fields (approximately 10 mT) are adequate to control the distribution of Weyl points and the large fictitious fields (equivalent to approximately a few hundred T) produced by them in momentum space, our discovery lays the foundation for a new field of science and technology involving the magnetic Weyl excitations of strongly correlated electron systems such as Mn3Sn.



中文翻译:

相关金属中磁性Weyl费米子的证据

Weyl费米子1,2,3被视为弱关联的,反转对称断裂的半金属4,5中的三维无间隙拓扑激发。但是,到目前为止,在强相关材料的自发时间逆转对称性破坏阶段中,它们的实现至今仍是假设的2,6,7。在这里,我们报告了Mn 3 Sn中的磁性Weyl费米子的实验证据,Mn 3 Sn是一种非共线的反铁磁体,即使在室温下也表现出大的异常霍尔效应8。角度分辨光发射光谱(ARPES)测量结果与密度泛函理论(DFT)计算结果之间的详细比较表明,由于Mn 3 d之间的强烈相关性,带宽重正化和阻尼效应显着电子。磁传输测量为韦尔费米子的手性异常提供了有力的证据,即,只有在平行电场和磁场的情况下,正磁导的出现。由于弱磁场(大约10 mT)足以控制Weyl点的分布以及它们在动量空间中产生的大虚拟场(约等于数百T),因此我们的发现为新的科学领域奠定了基础以及涉及强相关电子系统(例如Mn 3 Sn)的磁Weyl激发的技术。

更新日期:2017-09-25
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