Weyl semimetals are characterized by the presence of massless band dispersion in momentum space. When a Weyl semimetal meets magnetism, large anomalous transport properties emerge as a consequence of its topological nature. Here, using in−situ spin- and angle-resolved photoelectron spectroscopy combined with ab initio calculations, we visualize the spin-polarized Weyl cone and flat-band surface states of ferromagnetic Co₂MnGa films with full remanent magnetization. We demonstrate that the anomalous Hall and Nernst conductivities systematically grow when the magnetization-induced massive Weyl cone at a Lifshitz quantum critical point approaches the Fermi energy, until a high anomalous Nernst thermopower of ~6.2 μVK⁻¹ is realized at room temperature. Given this topological quantum state and full remanent magnetization, Co₂MnGa films are promising for realizing high efficiency heat flux and magnetic field sensing devices operable at room temperature and zero-field.

魏尔半金属的特征是在动量空间中存在无质量的带弥散。当Weyl半金属遇到磁性时，由于其拓扑性质，会出现较大的异常传输性质。在这里，使用原位自旋和角度分辨光电子能谱与从头算计算，我们可以看到具有完全剩磁的铁磁Co ₂ MnGa薄膜的自旋极化Weyl锥和平带表面状态。我们证明当Lifshitz量子临界点处的磁化感应大Weyl锥接近费米能量时，异常霍尔和能斯特电导率会系统地增长，直到〜6.2μVK ^-1的高异常能斯特热能在室温下实现。考虑到这种拓扑量子态和完全剩余的磁化强度，Co ₂ MnGa膜有望实现在室温和零场下工作的高效热通量和磁场感应装置。